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Multiple Resource Utilisation Developments in Mondi Forests
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Richard McC. Pott --- ,Defined as the use of available resources other than the planted trees on Mondi's landholdings, the development of various MRU projects is described from 1975 onwards. Projects are differentiated into those that are directly dependant on the presence of planted... -
Development of acoustic techniques for assessment of orange roughy Hoplostethus atlanticus biomass off Namibia, and of methods for correcting for bias
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: D. C. Boyer I. HamptonOrange roughy form dense spawning aggregations in specific small areas in deep water on the Namibian shelf between late June and early August each year. The biomass in three such areas, where most commercial fishing occurs (the Johnies, Frankies and... -
Fish response to the annual flooding regime in the Kavango River along the Angola/Namibian border
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: C. H. Hocutt P. N. JohnsonThe results of the first seasonal survey of the fish of the Kavango River flood-plain along the Angola/Namibia border are reported. The river experiences peak flooding from February through June, with the 375-km long floodplain extending up to 5 km... -
Changes in abundance of the northern Benguela sardine stock during the decade 1990–2000, with comments on the relative importance of fishing and the environment
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: D. C. Boyer H. J. Boyer I. Fossen A. KreinerThe northern Benguela stock of sardine Sardinops sagax used to be considered one of the major clupeoid stocks of the world; it supported an average annual catch of >700 000 tons throughout the 1960s. The stock has been in a... -
The structure of demersal assemblages off Namibia in relation to abiotic factors
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: H. Hamukuaya G. Bianchi D. BairdGroundfish surveys carried out between October 1992 and October 1996 were used to describe the demersal assemblages of the northern Benguela along the Namibian coast. Multivariate analyses indicated a clear separation between shelf and slope habitats, which were divided into... -
Economic characteristics of demand in Namibia's marine recreational shore fishery
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: F. Zeybrandt J. I. BarnesA sample of 626 anglers was surveyed with a questionnaire to determine the expenditures, consumer surpluses and elasticities of demand associated with the Namibian recreational marine shore fishery in 1998. Two entirely different methods of valuation, the travel cost method... -
An overview of the living marine resources of Namibia
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: D. C. Boyer I. HamptonThis paper gives an overview of the main living marine resources of Namibia. It focuses on the scientific research conducted during the past decade as input to the management of these resources. The distribution and habitats of the most important... -
Quantifying commercial catch and effort of monkfish Lophius vomerinus and L. vaillanti off Namibia
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: L. Maartens A. J. BoothAbundance and exploitation patterns of monkfish Lophius vomerinus and L. vaillanti were investigated for use as inputs into a stock assessment framework to be used for management of the Namibian monkfish resource. Total numbers of monkfish caught per size-class were... -
A review of orange roughy Hoplostethus atlanticus fisheries, estimation methods, biology and stock structure
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: T. A. BranchOrange roughy Hoplostethus atlanticus are unusual fish. They form dense aggregations that have fuelled lucrative fisheries at great depths (600–1 400 m), especially off Namibia, New Zealand and Australia. They are thought to be very long-lived (>100 years, maturity at... -
A decade of exploitation and management of the Namibian hake stocks
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: A. van der WesthuizenThe hake resource is the most important commercial fish species in the demersal sector of Namibia's fisheries, both in terms of annual catch and contribution to Gross Domestic Product (GDP). The fishery now spans four decades. In the 1960s and... -
Catch and effort of the shore and skiboat linefisheries along the South African Eastern Cape Coast
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: S. L. Brouwer C. D. BuxtonAn assessment of catch and effort in the Eastern Cape shore and skiboat linefisheries was undertaken between 1994 and 1996 by means of roving creel and access point surveys. Catch-and-effort data were obtained from direct observation of 3 273 shore-fishers,... -
Fishery characteristics and abundance estimates of the mangrove crab Scylla serrata in southern Tanzania and northern Moçambique
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: D. K. A. Barnes N. K. Dulvy S. H. Priestley W. R. T. Darwall V. Choisel M. WhittingtonThe mud crab Scylla serrata is lightly exploited along the East African seaboard. This study reports on fishing practices and gives preliminary estimates of abundance and size structures of the mud crab populations in Utende, Chole Island and Juani Island,... -
Changes to regulations and the gear used in the South African commercial fishery for Jasus lalandii
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: D. S. Schoeman A. C. Cockcroft D. L. Van Zyl P. C. GoosenAlterations to the operational fishing gear used in the South African west coast rock lobster Jasus lalandii fishery and their resultant impacts are investigated. The most important developments have been: (i) a change during the 1960s from hand-hauled hoopnets to... -
A new species of electric ray of the genus Narcine Henle, 1834 from the South-Western Indian Ocean (Chondrichthyes: Torpediniformes: Narcinidae)
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: M. R. de Carvalho B. Séret L. J. V. CompagnoA new species of electric ray of the genus Narcine Henle, 1834 is described from seven specimens collected from two localities off the western coast of Madagascar, in the Moçambique Channel. Narcine insolita, sp. nov. is distinguished from all other... -
Recommendations for the management of subsistence fisheries in South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: J. M. Harris G. M. Branch B. M. Clark A. C. Cockcroft C. Coetzee A. H. Dye M. Hauck A. Johnson L. Kati-Kati Z. Maseko K. Salo W. H. H. Sauer N. Siqwana-Ndulo M. SowmanThis paper summarizes recommendations for the management of previously marginalized and neglected subsistence fisheries in South Africa. The recommendations stem from the activities and analyses of a task group appointed by Government and mandated to provide advice about management of... -
Case studies on the socio-economic characteristics and lifestyles of subsistence and informal fishers in South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: G. M. Branch J. May B. Roberts E. Russell B. M. ClarkTo develop a management strategy for informal fishers, a necessary first step is information about the nature of these fishers, their numbers and their socio-economic status. To accomplish this, a survey of socio-economic conditions and use of marine resources was... -
Genetic and morphological variation of the lanternfish Lampanyctodes hectoris (Myctophiformes: Myctophidae) off southern Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: W. K. Florence P. A. Hulley B. A. Stewart M. J. GibbonsGenetic and morphological variation within the southern African population of Lampanyctodes hectoris was analysed. A total of 15 enzymes, encoding 22 isozyme loci, was examined (n = 327); seven were polymorphic. The percentage of polymorphic loci ranged from 13.6 to... -
Defining fishers in the South African context: subsistence, artisanal and small-scale commercial sectors
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: G. M. Branch M. Hauck N. Siqwana-Ndulo A. H. DyeEvolution of a new policy for the management of marine fisheries in South Africa led to the Marine Living Resources Act of 1998 (MLRA). Among other innovations, this requires that management strategies be developed for subsistence fisheries. As a prerequisite,... -
Perceptions of subsistence and informal fishers in South Africa regarding the management of living marine resources
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: M. Hauck M. Sowman E. Russell B. M. Clark J. M. Harris A. Venter J. Beaumont Z. MasekoFollowing the legal recognition of subsistence fishers in 1998 through the promulgation of the Marine Living Resources Act, a Subsistence Fisheries Task Group (SFTG) was appointed by national government to provide recommendations on the management of subsistence fishing in South... -
Identification of subsistence fishers, fishing areas, resource use and activities along the South African coast
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: B. M. Clark M. Hauck J. M. Harris K. Salo E. RussellA description is given of the research undertaken to provide a broad overview of the distribution and numbers of people who are subsistence or artisanal fishers and their activities along the coast of South Africa, to assist in the formulation... -
The process of developing a management system for subsistence fisheries in South Africa: recognizing and formalizing a marginalized fishing sector in South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: J. M. Harris M. Sowman G. M. Branch B. M. Clark A. C. Cockcroft C. Coetzee A. H. Dye M. Hauck A. Johnston L. Kati-Kati Z. Maseko K. Salo W. H. H. Sauer N. Siqwana-Ndulo J. BeaumontSubsistence fishers were first recognized as a formal fishing sector in South Africa when new fishing legislation, aimed at redressing past inequalities, was enacted in 1998. Little information was available about these fishers, their activities, and the resources upon which... -
Assessment of the recreational linefishery in selected Eastern Cape estuaries: trends in catches and effort
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: P. Pradervand D. BairdBoat-based creel surveys were used to collect catch and effort data on the shore- and boat-based linefisheries of the Kromme, Gamtoos, Swartkops, Sundays, Bushmans, Kariega, Kowie and Great Fish estuaries in the Eastern Cape, South Africa, from January 1996 to... -
Bycatch in the gillnet and beach-seine fisheries in the Western Cape, South Africa, with implications for management
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: K. Hutchings S. J. LamberthInterview questionnaires and access point surveys were conducted in order to describe and quantify the catch composition of the inshore net-fisheries in the Western Cape, South Africa. A total of 138 562 fish, representing 29 species from 20 families, was... -
Assessment of resource availability and suitability for subsistence fishers in South Africa, with a review of resource management procedures
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: A. C. Cockcroft W. H. H. Sauer G. M. Branch B. M. Clark A. H. Dye E. RussellThe availability of resources and their suitability for subsistence and small-scale commercial fishers in South Africa were assessed and appropriate options for the management of resources recommended. Assessment of current resource utilization and recommendations for future subsistence and/or small-scale commercial... -
Socio-economic characteristics of gillnet and beach-seine fishers in the Western Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: K. Hutchings S. J. Lamberth J. K. TurpieData collected by questionnaire and telephone surveys conducted during 1998 and 1999 are used to describe the socio-economic characteristics of inshore netfishers in the Western Cape. Approximately two-thirds of netfishers work or have worked in other fishing sectors and a... -
The role of the Tsitsikamma National Park in the management of four shore-angling fish along the south-eastern Cape coast of South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: P. D. Cowley S. L. Brouwer R. L. TilneyThe role of the Tsitsikamma National Park (TNP) in the management of four important shore-angling fish (Diplodus sargus capensis, Diplodus cervinus hottentotus, Pachymetopon grande and Dichistius capensis) was evaluated using data obtained from two independent studies conducted over a similar... -
THE JUVENILE FISH POPULATION IN THE MARGINAL AREAS OF THE HENDRIK VERWOERD DAM
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.A. Cambray --- Cape Department of Nature and Environmental Conservation, South Africa S. Hahndiek --- Cape Department of Nature and Environmental Conservation, South Africa Q. Hahndiek --- Cape Department of Nature and Environmental Conservation, South AfricaSmall seine nets were used to collect minnow and juvenile fish from a variety of habitats around the 350 km shoreline of the Hendrik Verwoerd Darn. In addition several areas were sectioned off from the darn and poisoned. The species... -
THE HABITATS AND HABITAT PREFERENCES OF
CLARIAS GARIEPINUS (PISCES: CLARIIDAE) IN A CLEAR COASTAL LAKE (LAKE SIBAYA, SOUTH AFRICA)Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: M.N. Bruton --- , South AfricaThe habitat preferences of the sharptooth catfish, Clarias gariepinus, in a clear coastal lake, Lake Sibaya, are described. Larval and small juvenile catfish inhabit flotsam and the rootstocks of plants in very shallow marginal areas. Larger juveniles inhabit densely-vegetated marginal... -
BATHYMETRIC STUDIES ON THE PONGOLO RIVER FLOODPLAIN
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: C.M. Breen --- Pongolo River Research Group, Departments of Botany, South Africa H.D. Furness --- Pongolo River Research Group, Departments of Botany, South Africa J. Heeg --- Pongolo River Research Group, Departments of Zoology, South Africa J. Kok --- Pongolo River Research Group, Departments of Zoology, South AfricaThirteen of the major pans on the Pongolo river floodplain have been studied. Most are shallow (>2.5 m) and regularly lose up to 70% of their water each year, although few dry out. Floods inundate considerable areas (1000 ha) around... -
THE SPECIFIC NAME OF THE SNAKE CATFISH, CLAXIAS THEOWRAE WEBER 1897
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P. B.N. Jackson --- , South AfricaWorkers revising Southern African freshwater fishes have endeavoured to provide brief information on those persons who have had fish named after them. The provenance of all such patronyms in currently valid species has been established with one exception: Clarias theodorae... -
THE USE OF BENZOCAINE HYDROCHLORIDE AS FISH TRANQUILLIZER AND ANAESTHETIC IN SALINE WATERS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: W.T. Barham --- Department of Zoology, South Africa K.M. Caiger --- Department of Zoology, South Africa J. G.J. Visser --- Department of Zoology, South AfricaThe anaesthetic effects of various concentrations of benzocaine hydrochloride were tested on Liza macrolepis and Sarotherodor mossambicus in sea water and diluted sea water, respectively. Induction time for anaesthesia was negatively correlated with increasing anaesthetic concentrations in L. macrolepis. -
ASPECTS OF THE FISHERIES OF LAKE LIAMBEZI, CAPRIVI
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B. C.W. van der Waal --- Department of Co-operation and Development, South AfricaLake Liambezi, situated in the Linyanti Swamp, Caprivi, is inhabited by 43 fish species. Population estimates with seine nets, rotenone and explosives gave values of 74 to 157 kg ha−1. The composition of seine net catches differed markedly from gill... -
A CHECKLIST OF THE FISH SPECIES OF THE CROCODILE AND MATLABAS RIVERS (LIMPOPO SYSTEM) OF THE TRANSVAAL
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: C.J. Kleynhans --- , South AfricaThis paper reports on the results of a fish distribution survey of the Crocodile and Matlabas Rivers (Limpopo System). Fifteen species are recorded for the first time in the Matlabas River. Seven unlisted species are recorded for the Crocodile River,... -
THE PLASMA PROTEINS OF SOME FRESHWATER FISH IN THEIR NATURAL ENVIRONMENT
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J. H.J. van Vuren --- Division of Nature Conservation, South AfricaThe plasma proteins of Cyprinus carpio (carp), Barbus holubi (yellowfish), Labeo umbratus (mudfish) and Labeo capensis (mudfish) were electrophoretically separated on polyacrylamide gels from blood samples obtained from specimens sampled during summer and winter in three different localities. Within a... -
POST-IMPOUNDMENT TRENDS IN THE FISH POPULATIONS OF THE HENDRIK VERWOERD DAM, SOUTH AFRICA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: K. C.D. Hamman --- Department of Nature and Environmental Conservation, South AfricaFish population changes in the Hendrik Verwoerd Dam are presented as sampled with a series of multifilament gill nets from Spring 1971 to Summer 1977. During this period, species such as Barbus halubi (smallmouth yellowfish), B. kimberleyensis (largemouth yellowfish), Labeo... -
ADDITIONS TO THE CHECKLIST AND RECENT CHANGES TO THE SCIENTIFIC NAMES OF SOUTHERN AFRICAN FRESHWATER FISHES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P.H. Skelton --- , South Africa R.A. Jubb --- , South Africa M.N. Bruton --- , South AfricaAlterations and additions to the checklist of southern African freshwater fishes are given based on recent findings and the latest literature. Name changes are given for 13 taxa, and 25 species and subspecies are added to the list. Several species... -
EFFECT OF CATTLE DIP CONTAINING TOXAPHENE ON THE FAUNA OF A SOUTH AFRICAN RIVER
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P.M. Brooks --- , South Africa B.D. Gardner --- , South AfricaIn August 1978 the Hluhluwe River, which runs through the Hluhluwe Game Reserve (Natal, South Africa), was polluted by toxaphene from a cattle dip tank. Faunal surveys were conducted to determine the impact of the insecticide on the fish and... -
RELATIVE FISH POPULATION DENSITY CHANGES IN THE P.K. LE ROUX DAM DURING THE FIRST THREE YEARS AFTER INUNDATION
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: I.G. Gaigher --- Department of Nature and Environmental Conservation, South Africa K. C.D. Hamman --- Department of Nature and Environmental Conservation, South Africa S.C. Thorne --- Department of Nature and Environmental Conservation, South AfricaBefore inundation in September 1976 Barbus holubi and Labeo capensis were the dominant species each making up 46% of the total catch. Immediately after impoundment the relative density of B. holubi increased to 75% while that of L. capensis dropped... -
QUALITY AND NUTRIENT RELEASE OF POULTRY MANURE IMMERSED IN WATER
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: O.V. Msiska --- Ministry of Forestry and Natural Resources, Fisheries Department, MalawiAttempts aimed at establishing a sound basis for the frequency of manure inputs into fish pond water showed that the greater bulk of mineral release occurs within 72 hours of immersion into water. Elemental composition of the poultry manure revealed... -
A COMPARISON OF DIFFERENT METHODS OF AGE DETERMINATION IN THE SHARPTOOTH CATFISH CLARIAS GARIEPINUS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: Douglas Clay --- Department of Zoology, U. K.Growth of the sharptooth catfish Clarias gariepinus from four southern African impoundments was estimated by back-calculating age from vertebrae and spines. Length frequency analysis supported the growth estimates derived from vertebrae but not those from spines.- Spines under-estimated the age... -
ADDITIONS TO THE CHECKLIST OF SOUTHERN AFRICAN FRESHWATER FISHES AND A GAZETTEER OF SOUTH-WESTERNANGOLAN COLLECTING LOCALITIES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: M.J. Penrith --- , South West AfricaAn additional 13 species of freshwater fishes recorded from south-western Angola, mainly from the Cunene Basin, are added to the checklist of southern African freshwater fishes, including five species of marine origin permanently resident in the fresh water of the... -
A CKECKLIST OF THE FISH SPECIES OF THE MOGOL AND PALALA RIVERS (LIEPOPO SYSTEM) OF THE TRANSVAAL
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: C.J. Kleynhans --- Transvaal Nature Conservation Division, South AfricaA survey of the fish species of the Mogol and Palala Rivers (Limpopo System) was conducted during 1979 and 1981. Thirty one indigenous fish species were sampled in the Mogol River, five of which were recorded for the first time... -
A TAXONOMIC STUDY OF SESSILE PERITRICHIANS OF A SMALL IMPOUNDMENT WITH NOTES ON THEIR SUBSTRATE PREFERENCES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: Sophié Viljoen --- Research Unit for Fish Biology, South Africa J.G. van As --- Research Unit for Fish Biology, South AfricaA taxonomic study of the sessile peritrichians (Ciliophora: Peritricha) was carried out on material collected from plants and animals, as well as inanimate substrates, experimentally placed into West-dene Dam, Johannesburg. A total of 15 species, representing the genera Carchesiwn, Voorticella,... -
FISH POPULATIONS IN THE MIDDLE AND LOWER ORANGE RIVER, WITH SPECIAL REFERENCE TO THE EFFECTS OF STREAM REGULATION
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.A. Cambray --- Cape Department of Nature and Environmental Conservation, Republic of South AfricaThe results of two surveys, in March 1982 and September 1983, on the distribution and status of freshwater fish in the highly regulated section of the Orange River, from the P.K. Le Roux Dam wall to the mouth of the... -
PRODUCTION OF THE AFRICAN CATFISH (CLARIAS GARIEPINUS) II. POPULATION PRODUCTION AS ESTIMATED FROM SURPLUS PRODUCTION MODELS FOR LAKE MCILWAINE, ZIMBABWE
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: Douglas Clay --- Marine Fish Division, Department of Fisheries and Oceans, CanadaThe population production of Clarias gariepinus was studied by Schaefer type surplus production models. The maximum sustainable yield of African catfish in Lake McIlwaine, Zimbabwe was found to be in the range of 33 000 to 41 000 kg (13,46... -
DIGESTION OF MICROCYSTIS AERUGINOSA BY OREOCHROMIS MOSSAMBICUS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: F.C. de Moor --- , South Africa W.E. Scott --- , South AfricaThe mean assimilation efficiency of aquarium acclimatized Oreochromis mossambiaue fed on a diet of Microcystis aeruginosa collected from Hartbeespoort Dam was determined as 50,8% for total organic matter, 63,7% for protein and 75,5% for phosphorus. Transmission electron microscopic examination of... -
CATCH AND EFFORT IN THE LAKE KARIBA SARDINE FISHERY
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.E. Marshall --- Department of Biological Sciences, ZimbabweThe fishery for Limnothrissa on Lake Kariba, which produced nearly 25 000 t in 1985, is backed by a comprehensive statistical system which increases the chance of using catch and effort models to manage it. The way in which effort... -
FISH SPECIES IN STEIUTONTEIN DAN, TUGELA-VAAI SYSTEM, SOUTH AFRICA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: W.G. Dörgeloh --- Nature Conservation Branch, Republic of South AfricaTwo alien species and seven indigenous species, including two minnow species, were present in Sterkfontein Dam. Of the larger species, Barbus aeneus and Labco capensis were the dominant in terms of numbers. -
AN EVALUATION OF BABY FISH FOOD AS A SUITABLE DIET FOR THE FRESHWATER SNAIL, BIOMPHALABIA GLABRATA (SAY)
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P.H. Joubert --- Research Institute for Diseases in a Tropical Environment, South Africa K.N. de Kock --- Research Institute for Diseases in a Tropical Environment, South AfricaTetra Kin Baby Fish Food ‘E’ for Egglayers (Tetra ‘E’) was evaluated as a possible nutrient for the laboratory culture and maintenance of pigmented and unpigmented Biomphalaria glabrata (Say). Growth was monitored weekly by determining shell diameter and mass. The... -
FRESHWATER FISH CONSERVATION IN SOUTH AFRICA: A RISING TIDE
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: M. Coke --- Natal Parks Board, South AfricaAttitudes towards the conservation of South African indigenous freshwater fishes have changed radically. Initially alien sport angling species were the focus of fisheries interest and local fishes were considered worthless. Gradually, in response to the work of collectors, taxonomists and... -
A QUARTER CENTURY OF GREAT LAKES RESEARCH IN AFRICA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: DavidH. Eccles --- , United KingdomThe African Great Lakes differ from shallower large African lakes by undergoing seasonal stratification and from large reservoirs in having long residence times, so that the ionic concentration of the lake water differs substantially from that of the inflows. -
DISTRIBUTION AND DIVERSITY OF MKUZE SWAMP FISHES DURING A SUMMER FLOOD
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: PH Skelton --- , South Africa AK Whitfield --- , South Africa N P E James --- , South AfricaVery little information is available on the fishes of the Mkuze swamps and this paper presents the results of an ichthyofaunal survey conducted in March 1988. The study, which coincided with a major river flood, determined that the fish fauna... -
Fish Collections Taken from a Small Agricultural Water Withdrawal Site on the Groot River, Gamtoos River System, South Africa
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: J.A. Cambray --- , South AfricaPeriodic water releases from Beervlei Dam on the Groot River of the Gamtoos River System were planned to flush the riverine pools of brack water and replace the pools with better quality water which was used to flood irrigate lucerne... -
DEEP SEA, ESTUARINE AND FRESHWATER FISHES: LIFE HISTORY STRATEGIES AND ECOLOGICAL BOUNDARIES
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: S. J.M. Blaber --- Division of Fisheries, AustraliaThe life histories of fishes from three different ecosystems are compared and discussed with emphasis on species that move between habitats: between estuary and sea in tropical northern Australia; between bottom waters and pelagic waters of the temperate continental slope... -
FISH CONSERVATION IN SOUTH AFRICAN ESTUARIES: PRESSURES, PROBLEMS AND PROSPECTS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D.P. Cyrus --- Coastal Research Unit of Zululand, Zoology Department, South AfricaA review of the conservation status of fish in the estuarine environment around the South African coastline reveals that some species face serious problems associated either with habitat destruction, and its associated biological, physical and chemical components or exploitation. The... -
TURBIDITY GRADIENTS IN TWO INDO-PACIFIC ESTUARIES AND THEIR INFLUENCE ON FISH DISTRIBUTION
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D.P. Cyrus --- Coastal Research Unit of Zululand, Department of Zoology, South AfricaResearch undertaken in two widely separated estuaries in the Indo-Pacific, showed that both have distinct turbidity gradients. In the turbid St Lucia System, on the South East Coast of Africa (range 2 to 568 Nephelometric Turbidity Units (NTU)), different turbidity... -
FIRST RECORD OF OREOCHROMIS MACROCHIR (BOULENGER, 1912) (PISCES:CICHLIDAE) FROM THE LIMPOPO RIVER IN SOUTHERN AFRICA.
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: C.J. Kleynhans --- , South Africa A. Hoffman --- , South AfricaDuring 1973/74, Barbus poechii, Oreochromis macrochir, O. andersonii, Serranochromis angusticeps, S. codringtonii, S. robustus and S. thumbergi from the Okavango System were introduced into the Shashe Dam (Limpopo System, Botswana). These species are alien to the Limpopo System. A fish... -
NEW DISTRIBUTION RECORDS FOR CLARIAS THEODORAE WEBER 1897, BARBUS EUTAENIA BOULENGER 1904, BARBUS POLYLEPIS BOULENGER 1907 AND OPSARIDIUM ZAMBEZENSE (PETERS 1852) FROM THE WATERBERG, TRANSVAAL, SOUTH AFRICA.
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: C.J. Kleynhans --- , South Africa A. Hoffman --- , South AfricaNew distribution records for four fish species in the Waterberg mountains of the Transvaal were established during surveys since 1987–92. Clarias theodorae was previously reported from one locality each in the Waterberg and Soutpansberg. The current survey disclosed its presence... -
IMPLICATIONS OF WATER RELEASE FROM THE PONGOLAPOORT DAM FOR THE FISH AND FISHERY OF THE PHONGOLO FLOODPLAIN, ZULULAND
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: G.S. Merron --- , South Africa M.N. Bruton --- , South Africa P. la Hausse de Lalouviere --- , South AfricaWetland fish stocks can usually be sustained as long as the natural flood regime is maintained, but unnatural disruption of the flooding pattern can interfere with fish spawning and feeding. The dynamics of the Phongolo floodplain fish community are determined... -
COASTAL AQUATIC ECOSYSTEMS, CONSERVATION AND MANAGEMENT STRATEGIES IN NIGERIA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: E.A. Ajao --- , NigeriaThe coastal ecosystems in Nigeria are classified into four broad regions according to differences in general morphology, vegetation and beach type. They are the barrier lagoon complex, the transgressive mud beach, the Niger delta and the strand coast. The delta... -
COMPARISON OF FISH GONADS AND FISH MEAL AS MAJOR COMPONENTS IN THE DIETS OF YOUNG AFRICAN SHARPTOOTH CATFISH, CLARIAS GARIEPINUS (BURCHELL)
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: L.C. Hoffman --- Aquaculture Research Unit, South Africa J.F. Prinsloo --- Aquaculture Research Unit, South Africa J. Theron --- Aquaculture Research Unit, South AfricaThe replacement of fish-meal (two sources, arbitrarily designated FMA and FMB), with either freeze dried (GVD) or oven dried (GOD) gonads of Clarias gariepinus in a starter diet for larvae of this species, was tested. No significant difference in larval... -
MASS MORTALITY OF MARINE AND ESTUARINE FISH IN THE SWARTVLEI AND WILDERNESS LAKE SYSTEMS, SOUTHERN CAPE.
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: I.A. Russell --- National Parks Board, South AfricaTwo incidences of mass mortality of fish were recorded in two saline waterbodies (Swartvlei estuary and Rondevlei) in the Wilderness National Park. Species affected were the Knysna seahorse (Hippocampus capensis) and longsnout pipefish (Syngnathus acus) in the Swartvlei estuary, and... -
MASS MORTALITIES OF FISH IN SOUTH AFRICAN ESTUARIES
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: A.K. Whitfield --- , South AfricaChanges to the physico-chemical environment have been identified as the cause of fish mass mortalities in South African estuaries. Most published accounts have linked these mortalities to a single dominant factor such as low salinity, low or high temperature, low... -
FISH TRAPPING DURING THE OPERATION OF THE DURBAN HARBOUR GRAVING DOCK, SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: L.E. Beckley --- , South Africa R.P. van der Elst --- , South Africa S.A. Chater --- , South Africa S.L. Birnie --- , South AfricaThe species composition and abundance of fishes trapped on the grids covering the drainage outlets in the Durban harbour graving dock were investigated over a 12 month period. Fifty-three species of fish and several invertebrates, including the crabs Scyllaserrata and... -
INFLUENCE OF FRESHWATER FLOW REGIME ON FISH ASSEMBLAGES IN THE GREAT FISH RIVER AND ESTUARY
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: L.D. Ter Morshuizen --- , South Africa A.K. Whitfield --- , South Africa A.W. Paterson --- , South AfricaTwo and a half years of data were collected from the lower Great Fish River, head region and estuary to determine the fish species composition within these areas. Gilchristella aestuaria, Liza dumerilii, Rhabdosargus holubi and Pomadasys commersonnii were the four... -
SOME OBSERVATIONS ON FISH MIGRATIONS IN CAPRIVI, NAMIBIA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: B. C.W. van der Waal --- , South AfricaLongitudinal and lateral migrations of freshwater fish were observed in 63 (83%) of the fish of the Upper Zambezi in the Caprivi region, Namibia. The results of 20 surveys showed that longitudinal upstream migrations were undertaken by most small cyprinids,... -
WATER TEMPERATURE AND THE 1987 FISH KILL AT LAKE ST LUCIA ON THE SOUTH EASTERN COAST OF AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D.P. Cyrus --- Coastal Research Unit of Zululand, Department of Zoology, South Africa S. McLean --- Coastal Research Unit of Zululand, Department of Zoology, South AfricaAn unusually cold spell during the winter of 1987 caused a drop in water temperature at Lake St Lucia. This coupled with typical estuarine salinities in the lake resulted in a fish kill. The kill was one of the largest... -
A COMPARISON OF ALLOZYME HETEROZYGOSITY AND LIFE HISTORY VARIABLES IN FOUR STRAINS OF AFRICAN CATFISH (CLARIAS GARIEPINUS)
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: J. P. Grobler --- , , L. C. Hoffman --- , , South Africa J. F. Prinsloo --- , , South AfricaWe studied allozyme polymorphism and its relation to morphological characteristics in 122 individuals from four lines of African catfish. Starch gel electrophoresis was used to screen 26 loci, of which five were polymorphic. Average heterozygosity levels differed moderately among lines... -
COMPOSITION, ABUNDANCE AND SEASONALITY OF LARVAL FISH IN RICHARDS BAY HARBOUR, KWAZULU-NATAL, SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: S. A. Harris --- , , South Africa D. P. Cyrus --- , , South AfricaThe present study examined the composition, abundance and seasonality of fish larvae occurring in Richards Bay Harbour, over an 18-month period from June 1991 to November 1992. Ichthyoplankton samples were collected every six weeks at top, mid and bottom depths... -
SOME OBSERVATIONS ON THE FISH LIFE IN A SEASONAL SAND RIVER
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: B. C.W. van der Waal --- , , South AfricaFive fish species were collected in a seasonal sand river that had migrated upstream more than 150 km from the permanent Limpopo River. The population structure indicated that mainly juveniles had taken part in this colonisation. No fish were collected... -
DUNE MINING AND THE NHLABANE SYSTEM: CAN BIODIVERSITY AND THE NURSERY FUNCTION BE MAINTAINED?
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D. P. Cyrus --- , , South Africa V. Wepener --- , , South AfricaA four year study of the Nhlabane Estuary and Lake System was undertaken over the period 1992 to 1995. Data gathered clearly showed that in terms of ichthyofauna, the estuary plays an important role as a nursery ground for juveniles... -
PRELIMINARY OBSERVATIONS ON THE FISH POPULATIONS OF THE RECENTLY-IMPOUNDED KATSE RESERVOIR, LESOTHO
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D. Tweddle --- , South Africa M. T.T. Davies --- , , South AfricaKatse is a new 35 km long impoundment on the Malibamatso River, a highland tributary of the Orange River in Lesotho. Two fishing surveys in 1996 yielded Barbus aeneus, Labeo capensis, Oncorhynchus mykiss and the occasional Austroglanis sclateri. Length frequency... -
FRESHWATER FISH OF THE ADDO ELEPHANT NATIONAL PARK
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: I. A. Russell --- , South AfricaThis study aimed to determine the distribution and relative abundance of freshwater fish in the Addo Elephant National Park. A total of 1578 fish specimens of 12 species were collected during surveys carried out in the Sundays River and four... -
GENETIC VARIATION IN TWO POPULATIONS OF THE ORANGE ROUGHY (HOPLOSTETHUS ATLANTIC US) FROM NAMIBIA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: N. S. Flint --- , , South Africa F. H. van der Bank --- , , South Africa P. J. Theron --- , , South Africa A. Staby --- , NamibiaThe orange roughy (Hoplostethus atlanticus) is a relatively new commercially exploited fish species, but it is currently ranked third amongst the world's top five seafood products. Gene products of 22 protein coding loci in two populations off the coast of... -
HIV and AIDS vulnerability in fishing communities in Mangochi district, Malawi
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Joseph Nagoli --- , Katrien Holvoet --- , Michelle Remme --- ,The fisheries sector contributes significantly to Malawi's national economy and to the livelihoods of the poor as certain activities in the sector have relatively low barriers to entry. Various studies have shown that the fisheries sector suffers from high HIV... -
The ‘Fish Trader+’ model: reducing female fish traders’ vulnerability to HIV
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: SaskiaMC Hüsken --- , Zambia Simon Heck --- , ZambiaAnalysis from research and practice in Africa shows that fishing communities are hardly reached by HIV-related services, education, and business services, partly because of the efforts and costs involved and a lack of good practice in reaching out to these... -
Transactional sex in the fishing communities along Lake Victoria, Kenya: a catalyst for the spread of HIV
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: ZacharyA Kwena --- Centre for Microbiology Research, Kenya Elizabeth Bukusi --- Centre for Microbiology Research, Kenya Enos Omondi --- Centre for Microbiology Research, Kenya Musa Ng'ayo --- Centre for Microbiology Research, Kenya KingK Holmes --- Department of Global Health, United StatesThe study describes the nature, context and implications of a unique form of transactional sexual relationships in the fishing communities along Lake Victoria in Kisumu County, Kenya. We conducted 12 focus group discussions and 17 key informant interviews among fishermen,... -
The sublethal effects of zinc at different water temperatures on selected haematological variables in Oreochromis mossambicus
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PP Buthelezi V Wepener DP CyrusTrace metals such as zinc play an important role in the normal metabolic functioning of all organisms. However, metals can become toxic if background concentrations are exceeded in the environment. This study investigated the sublethal effects of zinc on the... -
Some aspects of the ecology of the Groot Letaba River in the Northern Province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Vlok JS EngelbrechtThe aim of this pilot study was to evaluate the current ecological status of the Groot Letaba River and to compare this information with historical data. The objective was to determine the effects of various impacts on the fish populations... -
Fish as a resource in a rural river catchment in the Northern Province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BCW van der WaalThe rural population in the Mutshindudi River valley, in the north-eastern corner of the Northern Province, accept locally-caught freshwater fish as food (85%), but tinned pilchards are the most commonly eaten fish. Fishing gear was recorded in 70% of the... -
An assessment of the fish population of the lower reaches of the Sanyati River, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W MhlangaThe fish population of the lower reaches of the Sanyati River was studied using multifilament gillnets and monthly sampling was conducted over 13 consecutive months. A total of 15 fish species belonging to seven families were collected and variations in... -
Flagships and fragments — perspectives on the conservation of freshwater fishes in southern Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PH SkeltonFishes are relatively conspicuous inhabitants of freshwaters and therefore provide a useful means to monitor and relate aquatic conservation problems to the public. Human attitudes to the conservation of fishes and freshwaters have changed radically over the past 100 years... -
Can small-scale fisheries contribute to poverty alleviation in traditionally non-fishing communities in South Africa?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TG Andrew QA Rouhani SJ SetiThere has been considerable debate as to the contribution that fishing activities can make to food security and income generation in rural areas of South Africa where fishing has not traditionally been practised. The rural areas in the eastern half... -
The development of a GIS atlas of southern African freshwater fish
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LEP Scott PH Skelton AJ Booth L VerheustA geographic information systems (GIS) based atlas of southern African freshwater fish has been developed for the SADC countries. The JLB Smith Institute of Ichthyology, in collaboration with ALCOM, has developed a database of freshwater fish for this region from... -
Bioaccumulation of selected inorganic substances in the tissue of Oreochromis shiranus from Bunda Dam, Malawi
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PP Mumba JW Banda E Kaunda C Ndamala G GhambiA study to assess and monitor the concentrations of sulphate, sodium, magnesium, calcium, chloride, iron and nitrate in Bunda Dam was carried out from May to November 1998. The same parameters, except nitrate and chloride, were also determined in the... -
The icthyofauna of the Mhlathuze coastal lakes: some preliminary results
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SP Weerts DP CyrusThe fish faunas of the four Mhlathuze coastal lakes and the lower river comprise a diverse assortment of over fifty marine, estuarine and freshwater species. Three freshwater species are endemic to KwaZulu-Natal and nine estuarine species are endemic to southern... -
Juvenile fish recruitment through wave-overtopping into a closed subtropical estuary
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Vivier DP CyrusThe fish fauna of the subtropical Nhlabane estuary in northern KwaZulu-Natal was studied during a regional drought over the period 1991–1995. The estuary mouth closed in late 1991, due to the drought and to water abstraction from the system, and... -
A preliminary assessment of impacts on estuarine associated fauna resulting from an intra-basin transfer and fresh water abstraction from aquatic systems in the Richards Bay area of KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D CyrusAn intra-basin transfer and the abstraction of water from aquatic systems in the Richards Bay area has led to the construction of six barriers which are restricting faunal movement, a reduction of flow to the Mhlathuze and Nhlabane estuaries and... -
Spatial and seasonal distribution of the ichthyofauna of Lake Nokoué, Bénin, west Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: P Lalèyè C Niyonkuru J Moreau GG TeugelsThe fish biodiversity of Lake Nokoué, a lagoon in Bénin, was monitored for one year from August 2000 to July 2001 by means of samples from the artisanal fishery collected once a month at three stations. A total of 5... -
Fish assemblages in relation to environmental gradients along a small west African coastal basin, the San Pedro River, Ivory Coast
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Koné GG Teugels V N'Douba EP Kouamélan G Gooré BiPatterns of fish population composition were examined in the San Pedro River, Ivory Coast, in 2001 to assess whether distinct types of assemblage exist along longitudinal gradients within this small coastal basin. A total of 45 species was found: 28... -
Predation on snails by an indigenous fish, Sargochromis codringtonii, in ponds in Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MJ Chimbari H MadsenThe extent to which Sargochromis codringtonii (a known predator of snails) can control snail numbers was investigated in cementlined ponds in order further to evaluate the fish's potential as an agent for the biological control of fresh water snails, especially... -
The need for research and monitoring on the impacts of translocated sharptooth catfish, Clarias gariepinus, in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JA CambrayThe sharptooth catfish, Clarias gariepinus (Burchell, 1822), is a widespread African freshwater fish species which occurs naturally from the Nile to the Orange River. Through translocation aquaculturists, farmers, anglers and engineers have helped to extend its range into many South... -
The distribution and feeding ecology of the characid Brycinus sadleri in Lake Nabugabo, Uganda: implications for persistence with Nile perch (Lates niloticus)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JohnP Olowo LaurenJ Chapman ColinA Chapman Richard Ogutu-OhwayoCoincident with a rapid increase in numbers of introduced predatory Nile perch (Lates niloticus) in lakes Victoria, Kyoga, and Nabugabo of East Africa was a dramatic decline in populations of many native fishes. However, a few species, including the characid... -
The effects of lead, water hardness and pH on oxygen consumption, plas- ma chlorides and bioaccumulation in the freshwater fish Tilapia sparrmanii
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: WJ van Aardt LCR VenterClosed system respirometry was performed on captive juvenile Tilapia sparrmanii exposed for 96 hours to a range of Pb-acetate concentrations in hard and soft water to determine the effect of Pb in relation to water hardness and pH. For hard... -
Mortality estimates and biological reference points for the Natal stumpnose Rhabdosargus sarba (Pisces: Sparidae) in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NC James BQ Mann PV RadebeA per-recruit stock assessment was undertaken for the sparid Rhabdosargus sarba, which is caught in estuarine and marine shore fisheries in KwaZulu-Natal. Input parameters used in the analyses included age and growth parameters and mortality estimates from catch curves. The... -
The artisanal fishery of Metangula, Lake Malawi/Niassa, East Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JoséS Halafo RobertE Hecky WilliamD TaylorThe artisanal fishery of Metangula, on the remote Mozambique coast of Lake Malawi/Niassa, was studied for four months during the rainy season from December 1998 to March 1999. Catch, catch composition and fishing effort were determined for the most important... -
A preliminary assessment of the impact of alien rainbow trout (Oncorhynchus mykiss) on indigenous fishes of the upper Berg River, Western Cape Province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DJ Woodford ND ImpsonImpacts of alien rainbow trout (Oncorhynchus mykiss) on critically endangered Berg River redfin (Pseudobarbus burgi), Cape kurper (Sandelia capensis) and Cape galaxias (Galaxias zebratus) in the upper Berg River were investigated in terms of predation and spatial interactions. Trout stomach... -
Development and application of a fish-based Sensitivity-weighted Index of Biotic Integrity (SIBI) for use in the assessment of biotic integrity in the Klip River, Gauteng, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PJ Kotze GJ Steyn HH du Preez CJ KleynhansBiotic indices using fish assemblage characteristics have been applied with great success in river assessments around the world. Internationally the most commonly applied fish index is the Index of Biotic Integrity (IBI), whilst in South Africa the most commonly applied... -
Limnology of southern African coastal lakes — new vistas from Mozambique
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RobC Hart Custodio BoaneFourteen mostly small, isolated, and relatively deep coastal inundation lakes were surveyed during the cool season (August) of 1996. No thermal or chemical stratification existed, but near-bottom hypoxia was evident in several systems. Ionic conductivity varied quite widely, but was... -
The primary carbon sources utilised by fishes in the Mngazi and Mngazana estuaries, South Africa: a preliminary assessment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Sekiwe Mbande William Froneman AlanK WhitfieldA number of studies have used stable carbon isotopes to analyse aspects of the food web structure in South African estuaries but none has compared mangrove and non-mangrove estuarine food webs. This study compares the primary carbon sources utilised by... -
Indigenous names of fish and fishing gear in the Cuvelai, Kavango and Caprivi regions of Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DanielO Okeyo George Mubita ThomasK Harris DagberthE Sahombu Josephat Namundjanga Samson Mulonga S KapirikaThis study discusses the local names of the inland fresh water fish species of the Cuvelai, Kavango and Caprivi regions of Namibia, in five indigenous languages: OshiWambo/OshiNdonga, RuKwangali, RuGciriku, SiLosi and SiSubia. It also discusses local names of the indigenous... -
Preliminary results on the ichthyocidal properties of Euphorbia ingens (Euphorbiaceae)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MathewJ Ross GertJ SteynEuphorbia ingens belongs to the family Euphorbiaceae, which includes a variety of latex-producing plants, the majority of them having ichthyocidal properties (Coates-Palgrave 2000). Tests to determine the degree of virulence of E. ingens latex used Cyprinus carpio and Xenopus laevis... -
Diel and tidal variations in larval fish exchange in the mouth region of the Gamtoos Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NA Strydom TH WooldridgeDiel and tidal variations in density of larval fishes were monitored over one neap and one spring tidal cycle in the mouth region of the warm temperate Gamtoos Estuary, South Africa. Data were collected over two 24h periods, using mixed... -
Artisanal gill-net fishery catches of the catfish, Schilbe intermedius (Teleostei: Schilbeidae), in two tributaries of the Ouémé River, Bénin, West Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Philippe Lalèyè Osmane Salako Antoine Chikou Jean Claude PhilippartArtisanal fishery gill-net catches of the catfish Schilbe intermedius were studied in the Okpara and Zou tributaries of the Ouémé River, Benin in 1999 and 2000. The largest fish caught at the Toué and Kpassa stations measured 26.2cm and 24.5cm... -
The predatory impact of invasive alien smallmouth bass, Micropterus dolomieu (Teleostei: Centrarchidae), on indigenous fishes in a Cape Floristic Region mountain stream
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DarraghJ Woodford N Dean Impson JennyA Day I Roger BillsFish populations in the Rondegat River, a mountain stream in the Olifants-Doring system in the Cape Floristic Region, South Africa were surveyed to assess the impact of predatory alien invasive smallmouth bass Micropterus dolomieu (Lacepède) on the indigenous fishes. This... -
Fish communities along environmental gradients within the Comoé River basin, Côte d'Ivoire
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: StanislasS Yao EssetchiP Kouamélan Tidiani Koné Valentin N'Douba Gooré Bi Frans Ollevier DirkF E Thys van den AudenaerdeEighty-four sites in the Comoé basin (Côte d'Ivoire, West Africa) were sampled to identify fish assemblages and their relationships with some environmental variables. Seventy-six freshwater fish species were collected from 22 families and 44 genera: 11 marine and/or brackish water... -
Status of the estuarine fish fauna in the St Lucia Estuarine System, South Africa, after 30 months of mouth closure
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Digby Cyrus Leon VivierThe Lake St Lucia Estuarine System, South Africa, has been under pressure due to recent drought conditions, which led to extreme low lake levels, hypersaline conditions and closure of the mouth. The estuary mouth closed in June 2002 and has... -
Extreme levels of intra-specific divergence among Cape Peninsula populations of the Cape galaxias, Galaxias zebratus Castelnau 1861, reveals a possible species complex
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Marcus Wishart Jane Hughes Barbara Stewart Dean ImpsonThe Cape galaxias, Galaxias zebratus, is part of the paleao-endemic fauna characteristic of the south-western Cape, South Africa, and is the only galaxiid found in continental Africa. A 284-bp fragment of the cytochrome b region of the mtDNA was sequenced... -
Translocation of marbled African lungfish, Protopterus aethiopicus (Telostei: Protopteridae), and its fishery in Lake Baringo, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: ChrisestomM Mlewa JohnM GreenThe translocation of the marbled African lungfish Protopterus aethiopicus into Lake Baringo created a new fishery for the local community, who capture them primarily in a bottom-set long line fishery. Its introduction, development and current fishery status in the lake... -
The food and feeding habits of five freshwater and brackish-water fish species in Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PO Ajah MN Georgewill MO AjahThe food and feeding habits of five economically important fresh-and brackish-water fishes, Channa obscura, Chrysichthys nigrodigitatus, Heterotis niloticus, Synodontis nigrita and Trachinotus maxillosus, were investigated. A number of techniques were used to carry out gut content analysis, including the Hynes... -
Comparative analysis of the aquaculture potential of hybrid Tilapia zillii (male) × T. guineensis (female) (Teleostei: Cichlidae) in floating cages, cement tanks and earth ponds
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CélineSK Nobah Tidiani Koné Valentin N'Douba Jos Snoeks Gouli Gooré Bi EssetchiP KouamélanThe effect of three rearing systems, floating cages, cement tanks and earth ponds, on the growth rate, feeding efficiency and mortality rates of hybrid tilapia — Tilapia zillii (male) × T. guineensis (female) — was evaluated for 233 days. Fish... -
The sublethal effects of copper and lead on the haematology and acid-base balance of the groovy mullet, Liza dumerili
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HM Mzimela --- Coastal Research Unit of Zululand, Department of Zoology, South Africa V Wepener --- Coastal Research Unit of Zululand, Department of Zoology, South Africa DP Cyrus --- Coastal Research Unit of Zululand, Department of Zoology, South AfricaToxicity bioassays were conducted on groovy mullet, Liza dumerili, using copper and lead, in order to assess how these metals affected their blood haematology and acid-base balance. Short-term (96 hours) exposure to lead caused significantly more haematological response [PCO2] than... -
Potential impacts of alien freshwater crayfish in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: I de Moor --- , South AfricaThe habitat preferences and life history characteristics of four alien species of freshwater crayfish (Cherax tenuimanus, C. destructor, C. quadricarinatus and Procambarus clarkii) are reviewed. The potential impact of these species on South African freshwater ecosystems is assessed and the... -
A preliminary quantitative assessment of gillnet fishing in subtropical Lake Tzaneen, Northern Province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NN Nicolaai --- Department of Zoology and Biology, South Africa A Jooste --- Department of Zoology and Biology, South AfricaBetween January 1998 and January 1999 a quantitative investigation was done on the fish populations of Lake Tzaneen, Northern Province, South Africa. Two graded series of multi-filament gillnets were set overnight every six weeks capturing 14 species of fish. Of... -
Changes to the scientific and common names of southern African freshwater fishes
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PH Skelton --- , South AfricaAdditions and changes to the scientific and common names of southern African freshwater fishes made since 1993, are recorded and explained. Nineteen new scientific names are listed including five new species, three genus-name changes, three species-name changes and four new... -
The distribution and relative abundance of stream fishes in the upper Manyame River, Zimbabwe, in relation to land use, pollution and exotic predators
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: B Gratwicke --- Department of Biological Sciences, Zimbabwe BE Marshall --- Department of Biological Sciences, Zimbabwe T Nhiwatiwa --- Department of Biological Sciences, ZimbabweA survey of the upper Manyame River catchment, middle Zambezi system, Zimbabwe, yielded a total of 22 fish species from 48 stations. The most widespread species (present at >20 stations) were Marcusenius macrolepidotus, Barbus paludinosus, Labeo cylindricus, Clarias gariepinus and... -
The global impact of alien trout species—a review; with reference to their impact in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JA Cambray --- Makana Biodiversity Centre, South AfricaRainbow and brown trout have been introduced into at least 82 countries, where they have significantly impacted indigenous fish, aquatic invertebrates and amphibians. In many studies the second, and sometimes the first, most serious identified threat to indigenous aquatic fauna... -
Checklist of the fish parasitic genus Cichlidogyrus (Monogenea), including its cosmopolitan distribution and host species
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LE le Roux --- Department of Zoology, South Africa A Avenant-Oldewage --- Department of Zoology, South AfricaCurrent knowledge of the 85 species in the genus Cichlidogyrus, collected worldwide, including their hosts, localities and authors, is summarised in a table. Although these parasites occur mainly in Africa, representatives have been recorded on cichlids in Mexico. Their distribution... -
Accumulation of hepatic Hsp70 and plasma cortisol in Oreochromis mossambicus following sublethal metal and DDT exposure
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SS Mlambo --- Centre for Aquatic Research, Zoology Department, South Africa JHJ van Vuren --- Centre for Aquatic Research, Zoology Department, South Africa R Basson --- Centre for Aquatic Research, Zoology Department, South Africa B Grant --- Centre for Aquatic Research, Zoology Department, South AfricaHeat shock response in Oreochromis mossambicus livers was measured, using antibodies specific to Hsp70 family members, by an immunoblotting protocol. The hepatic isoforms Hsp70, Hsp74 and Hsp76 were identified and quantified from copper exposures. Long-term DDT exposure did not result... -
Water quality impacts on instream biota of the Shingwedzi River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PSO Fouche --- Department of Zoology, South Africa W Vlok --- Department of Zoology, South AfricaWater quality, macroinvertebrate diversity (using SASS5) and fish diversity (using the fish response assessment index) of the Shingwedzi River system were monitored in 2007/2008 to determine the present status of the system. Possible water pollution sources were identified by aerial... -
Fish assemblages in the Mfolozi–Msunduzi estuarine system, KwaZulu-Natal, South Africa, when not linked to the St Lucia mouth
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Vivier --- Coastal Research Unit of Zululand, Department of Zoology, South Africa DP Cyrus --- Coastal Research Unit of Zululand, Department of Zoology, South Africa RK Owen --- Coastal Research Unit of Zululand, Department of Zoology, South Africa HL Jerling --- Coastal Research Unit of Zululand, Department of Zoology, South AfricaThe fish community of the Mfolozi–Msunduzi estuarine system was investigated with particular emphasis on its role as a nursery area for marine fish when the adjacent St Lucia mouth is closed. The mouth was open during March 2007 and 2008... -
Ecological status and role of the Mfolozi–Msunduzi estuarine system within the iSimangaliso Wetland Park, a World Heritage Site on the south-east coast of South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DP Cyrus --- Coastal Research Unit of Zululand, Department of Zoology, South Africa L Vivier --- Coastal Research Unit of Zululand, Department of Zoology, South Africa RK Owen --- Coastal Research Unit of Zululand, Department of Zoology, South Africa HL Jerling --- Coastal Research Unit of Zululand, Department of Zoology, South AfricaThe original structure and functioning of the historical Mfolozi–St Lucia estuarine system are described and anthropogenic impacts, which resulted in the Mfolozi and Msunduzi rivers being separated from the St Lucia Estuary and having their own combined mouth to the... -
Stream degradation, fish abundance and the potential viability of ornamental fisheries in south-western Cameroon
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RE Brummett --- , Cameroon C Cargill --- , Cameroon LM Lekunzé --- , Cameroon D Puddister --- , CameroonFifteen sites on nine second- and third-order streams in the Mount Cameroon area, with varying degrees of human disturbance, were sampled during wet and dry seasons over 21 months in 2003–2005 to estimate their potential for sustainable exploitation of ornamental... -
A comparison between fish assemblages in mangrove forests and on intertidal flats at Ungwana Bay, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DO Mirera --- , Kenya JG Kairo --- , Kenya EN Kimani --- , Kenya FK Waweru --- , KenyaFish assemblages of mangrove forest patches and adjacent intertidal flats in Ungwana Bay were compared using stake-net sampling in the mangrove forest and intertidal flat habitats between December 2002 and November 2003. Four forest sites were compared with paired intertidal... -
Genetically distinct Dutch-domesticated Clarias gariepinus used in aquaculture in southern Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Roodt-Wilding --- Department of Genetics, South Africa BL Swart --- Department of Genetics, South Africa ND Impson --- , South AfricaClarias gariepinus, a catfish species widely distributed in Africa including South Africa, is naturally absent from the Western Cape and the coastal Eastern Cape provinces. Because of its potential as an aquaculture species it has been widely used in aquaculture... -
Alexandrium catenella and Alexandrium tamarense in the North Lake of Tunis: bloom characteristics and the occurrence of paralytic shellfish toxin
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Z Armi --- , Tunisie A Milandri --- , Italie S Turki --- , Tunisie B Hajjem --- , TunisieThe dinoflagellate Alexandrium is thought to be the main species responsible for paralytic shellfish poisoning (PSP) throughout the world. The genus Alexandrium is present in unusually high diversity in the North Lake of Tunis, a productive Mediterranean fishing and shellfish... -
Fatty acids of polar lipids in heart tissue are good taxonomic markers for tropical African freshwater fish
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: J Kwetegyeka --- Department of Chemistry, Uganda J Masa --- Department of Chemistry, Uganda BT Kiremire --- Department of Chemistry, Uganda GB Mpango --- Department of Chemistry, Uganda O Grahl-Nielsen --- Department of Chemistry, NorwayThe fatty acid profiles in total, neutral and polar lipids in the heart tissues of five freshwater fish species (Nile perch Lates niloticus, Nile tilapia Oreochromis niloticus, marbled lungfish Protopterus aethiopicus, Bagrus docmak and African catfish Clarias gariepinus) from Lakes... -
Distribution of Nile perch Lates niloticus in southern Lake Victoria is determined by depth and dissolved oxygen concentrations
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PC Goudswaard --- , the Netherlands EFB Katunzi --- , Tanzania JH Wanink --- , the Netherlands F Witte --- , the NetherlandsAlthough Nile perch Lates niloticus is assumed to be sensitive to low oxygen concentrations, it was found in deep water in Lake Victoria, where oxygen depletion is common during the rainy season. Since factors determining Nile perch distribution are not... -
Age, growth rate and size at sexual maturity of Labeobarbus aeneus (Teleostei: Cyprinidae) in the middle Vaal River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Gerber --- Centre for Aquatic Research, Department of Zoology, South Africa NJ Smit --- Centre for Aquatic Research, Department of Zoology, South Africa GM Wagenaar --- Centre for Aquatic Research, Department of Zoology, South AfricaAge structure, growth and size at sexual maturity of smallmouth yellowfish, Labeobarbus aeneus (Burchell), were assessed in 2008–2009. Despite its angling and food importance, little has been published on many aspects of its ecology and biology, specifically its age structure... -
Influence of waterfalls on patterns of association between trout and Natal cascade frog Hadromophryne natalensis tadpoles in two headwater streams in the uKhahlamba Drakensberg Park World Heritage Site, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RJ Karssing --- , South Africa NA Rivers-Moore --- , South Africa K Slater --- Department of Environmental Sciences, South AfricaCurrent literature suggests that little, if any, research has been conducted in South Africa to determine the impact of alien trout on indigenous amphibian biodiversity. The aim of this study was to establish whether waterfalls in the uKhahlamba Drakensberg Park,... -
The burrowing behaviour of Bulinus nyassanus, intermediate host of Schistosoma haematobium, in Lake Malaŵi
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Madsen --- DBL Centre for Health Research and Development, Faculty of Life Sciences, JR Stauffer --- School of Forest Resources, USAThere is evidence that transmission of Schistosoma haematobium has increased in some areas in the southern part of Lake Malaŵi, where transmission occurs both along open shorelines and at inland sites. Transmission along open shores in the lake is via... -
Diet of the demersal feeding Leiognathus equula in the Mfolozi–Msunduzi estuarine system, South Africa, in response to an impoverished macrobenthic invertebrate community
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JBB Nhleko --- Coastal Research Unit of Zululand, Department of Zoology, South Africa DP Cyrus --- Coastal Research Unit of Zululand, Department of Zoology, South Africa L Vivier --- Coastal Research Unit of Zululand, Department of Zoology, South AfricaLeiognathus equula, a species generally regarded as a zoobenthic feeder, was the most abundant fish species sampled in the Mfolozi–Msunduzi estuarine system in 2008–2010, despite the zoobenthos in this system being impoverished. Four dietary assessment methods all confirmed that its... -
Optimum rabbit density over fish ponds to optimise Nile tilapia production in an integrated rabbit–fish system in Rwanda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Rukera Tabaro --- School of Environmental Science, South Africa O Mutanga --- School of Environmental Science, South Africa D Rugege --- School of Environmental Science, South Africa JC Micha --- Research Unit in Environmental Biology, Department of Biology, BelgiumAlthough previous studies have suggested that rabbit excreta can be used as high-quality manure for sustaining plankton production due to their gradual nutrient release, integrated rabbit–fish production systems are still not widely used. Between 2006 and 2010 optimal rabbit densities... -
A preliminary survey of biotic composition of the Olifantspruit catchment, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: ZCC Khoza --- Department of Biodiversity, South Africa MJ Potgieter --- Department of Biodiversity, South Africa W Vlok --- Department of Zoology, South AfricaAs a major tributary of the Nyl River, and ultimately for the Nylsvley wetland, the Olifantspruit, Limpopo province, South Africa, was investigated during the summer (high flow) and winter (low flow) of 2007 at three sites. This preliminary study used... -
Comparative behavioural assessment of an established and a new tigerfish Hydrocynus vittatus population in two man-made lakes in the Limpopo River catchment, southern Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GC O'Brien --- Water Research Group (Ecology), Unit for Environmental Science and Management, South Africa JB Bulfin --- , Ireland A Husted --- Centre for Aquatic Research, South Africa NJ Smit --- Water Research Group (Ecology), Unit for Environmental Science and Management, South AfricaWith the continued establishment of man-made lakes within the natural distribution range of tigerfish in southern Africa, many artificial tigerfish populations now exist in the region. Very little of the behavioural ecology of these artificial but ecologically important populations is... -
Fish sampling in the marine-dominated Kariega Estuary, South Africa, using a demersal otter trawl: day/night effects
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SE Bailey --- , South Africa NC James --- , South AfricaVery few demersal fish assemblage studies using otter trawls in estuaries have been done in South Africa and none of these have tested for the effects of diel period. This study aimed to test whether diel period affects otter trawl... -
Health of sharptooth catfish Clarias gariepinus in Pongolapoort Dam, South Africa: a comprehensive study
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: KJ McHugh --- Centre for Aquatic Research, South Africa NJ Smit --- Water Research Group (Ecology), Unit for Environmental Sciences and Management, South Africa JHJ van Vuren --- Centre for Aquatic Research, South Africa JC van Dyk --- Centre for Aquatic Research, South AfricaA histology-based fish health assessment protocol was used in 2009–2010 to assess the health status of Clarias gariepinus from Pongolapoort Dam, South Africa. Nineteen fish were collected by angling. The histology of liver, kidney, gills and testes or ovaries was... -
Phenotypic characterisation in interspecific and intergeneric hybrids of the clariid catfishes Heterobranchus longifilis, Clarias gariepinus and Clarias anguillaris in Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AA Akinwande --- Department of Fisheries Technology, Nigeria OA Fagbenro --- Department of Fisheries and Aquaculture, Nigeria OT Adebayo --- Department of Fisheries and Aquaculture, NigeriaThirty-nine morphometric and five meristic comparisons were carried out on 12-month-old interspecific and intergeneric hybrids of the African clariid catfishes Heterobranchus longifilis, Clarias gariepinus and Clarias anguillaris from experimental earthen ponds in Nigeria. Canonical discriminant analysis accounted for 89.4% of... -
Functionality evaluation of the Xikundu fishway, Luvuvhu River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PSO Fouché --- Zoology Department, South Africa RG Heath --- Golder Associates Africa, South AfricaThe Xikundu fishway, in the Luvuvhu River near Thohoyandou, was monitored for 23 months in 2004–2006. Adults and juveniles of 60% of the expected fish species were collected in the fishway, and two major upstream migrations occurred. Most Labeo and... -
Validation of the periodicity of growth increment deposition in otoliths from the larval and early juvenile stages of two cyprinids from the Orange–Vaal river system, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BR Paxton --- Water Research Group (Ecology), School of Environmental Sciences and Development, Potchefstroom Campus, South Africa GC O'Brien --- Water Research Group (Ecology), School of Environmental Sciences and Development, Potchefstroom Campus, South Africa JA Slingsby --- South African Environmental Observatory Network, South Africa R Copin --- Zoology Department, South AfricaThis study tested the hypothesis that growth increments in larval largemouth yellowfish Labeobarbus kimberleyensis and smallmouth yellowfish L. aeneus from the Orange–Vaal river system, South Africa, are deposited daily. The periodicity of increment formation was determined by regular sampling and... -
Toxicity of the chlorpyrifos-based pesticide Termifos®: effects on behaviour and biochemical and haematological parameters of African catfish Clarias gariepinus
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CD Nwani --- Department of Zoology and Environmental Biology, Nigeria DO Ugwu --- Department of Zoology and Environmental Biology, Nigeria OC Okeke --- Department of Zoology and Environmental Biology, Nigeria GC Onyishi --- Department of Zoology and Environmental Biology, Nigeria FN Ekeh --- Department of Zoology and Environmental Biology, Nigeria C Atama --- Department of Zoology and Environmental Biology, Nigeria LO Eneje --- Department of Applied Microbiology and Brewing, NigeriaThe present study, conducted in 2012, determined the toxicity of the chlorpyrifos-based pesticide Termifos® and its effects on behaviour and biochemical and haematological parameters in juvenile African catfish Clarias gariepinus. The 96 h LC50, estimated by probit analysis in a... -
Temporal variations in the food habits of some fish species in Lake Nokoué, Benin
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: P Gnohossou --- Laboratoire d’Hydrobiologie et Aquaculture, Bénin P Lalèyè --- Laboratoire d’Hydrobiologie et Aquaculture, Bénin P Atachi --- Laboratoire d’Hydrobiologie et Aquaculture, Bénin G Magali --- Laboratoire EcoLab, UMR 5245 CNRS-UPS-INPT, France MC Villanueva --- Laboratoire d’Agronomie, Environnement et Écotoxicologie, France J Moreau --- Laboratoire d’Agronomie, Environnement et Écotoxicologie, FranceStomach contents of the 12 most abundant fish species in Lake Nokoué, Benin, collected between 2003 and 2005, were analysed for temporal variations in their diet. Several species showed seasonal shifts in their diets based on benthic prey abundance and... -
Variations and changes in habitat, productivity, composition of aquatic biota and fisheries of the Kyoga lake system: lessons for management
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Ogutu-Ohwayo --- National Fisheries Resources Research Institute, Uganda K Odongkara --- National Fisheries Resources Research Institute, Uganda W Okello --- National Fisheries Resources Research Institute, Uganda D Mbabazi --- National Fisheries Resources Research Institute, Uganda SB Wandera --- National Fisheries Resources Research Institute, Uganda LM Ndawula --- National Fisheries Resources Research Institute, Uganda V Natugonza --- National Fisheries Resources Research Institute, UgandaThe Kyoga lake system, which is c. 4 m deep, originally had a diverse fish fauna, extensive macrophytes and wetlands. Most (82%) of its water comes from Lake Victoria, is controlled through three dams and has a short residence time... -
Has climate change disrupted stratification patterns in Lake Victoria, East Africa?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BE Marshall --- Lake Victoria Fisheries Organisation, Uganda CN Ezekiel --- Tanzanian Fisheries Research Institute, Tanzania J Gichuki --- Kenya Marine and Freshwater Fisheries Institute, Kenya OC Mkumbo --- Lake Victoria Fisheries Organisation, Uganda L Sitoki --- Kenya Marine and Freshwater Fisheries Institute, Kenya F Wanda --- National Fisheries Resources Research Institute, UgandaClimate change may threaten the fisheries of Lake Victoria by increasing density differentials in the water column, thereby strengthening stratification and increasing the intensity and duration of deoxygenation in the deeper waters. Between 1927 and 2008 the lake's temperature increased... -
Habitat use pattern of three species of egrets in a small coastal lagoon in Ghana
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Francis Gbogbo --- Department of Animal Biology and Conservation Science, Ghana Gideon Kwarteng Acheampong --- Department of Animal Biology and Conservation Science, Ghana John-Mark Yaw Atiemo --- Department of Animal Biology and Conservation Science, Ghana Quist Elorm Crepindale --- Department of Animal Biology and Conservation Science, GhanaThe foraging and pattern of habitat use of Western Reef Heron Egretta gularis, Little Egret Egretta garzetta and Great Egret Egretta alba were studied in Sakumo II Lagoon in Ghana to determine the extent of utilisation of non-fish resources by... -
Nile tilapia invades the Lake Malawi catchment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MJ Genner --- School of Biological Sciences, UK E Connell --- School of Biological Sciences, UK A Shechonge --- School of Biological Sciences, UK A Smith --- Department of Biological Sciences, UK J Swanstrom --- School of Biological Sciences, UK S Mzighani --- Tanzania Fisheries Research Institute (TAFIRI), Tanzania A Mwijage --- Tanzania Fisheries Research Institute (TAFIRI), Tanzania BP Ngatunga --- Tanzania Fisheries Research Institute (TAFIRI), Tanzania GF Turner --- School of Biological Sciences, UKThe Lake Malawi/Nyasa catchment contains over 835 endemic cichlid fish species. This unique biodiversity has made it widely recognised as one of the world's most significant freshwater ecosystems. Here we report the first occurrence records of two invasive tilapiines, Oreochromis... -
Could phosphorus concentrations increase with the development of cage culture in Lake Kariba, Zimbabwe?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Mhlanga --- Department of Biological Sciences, Zimbabwe W Mhlanga --- Department of Environmental Science, Zimbabwe P Mwera --- Lake Harvest, Zimbabwe P Tendaupenyu --- Department of Biological Sciences, ZimbabweA comparison between historical and current data was done to determine whether the concentrations of total phosphorus, orthophosphate and chlorophyll a, and Secchi disc transparency, have changed in the Sanyati Basin of Lake Kariba following the commencement of cage culture... -
Hybridisation between native Oreochromis species and introduced Nile tilapia O. niloticus in the Kafue River, Zambia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AM Deines --- Notre Dame Environmental Change Initiative, and Department of Biological Sciences, USA I Bbole --- The Copperbelt University, Zambia C Katongo --- The Copperbelt University, Zambia JL Feder --- Notre Dame Environmental Change Initiative, and Department of Biological Sciences, USA DM Lodge --- Notre Dame Environmental Change Initiative, and Department of Biological Sciences, USAThe Nile tilapia Oreochromis niloticus has been introduced throughout Africa outside its native range for aquaculture purposes. Hybridisation between escaped O. niloticus and native Oreochromis species is of concern due to potential negative effects on wild genetic resources for conservation,... -
Science and Fisheries Management in Southern Africa and Europe©
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A. I. L. Payne R. C. A. BannisterCase studies on southern African sardine and anchovy, Cape hake and West Coast rock lobster off southern Africa are described and compared with North Sea herring and cod, and Nephrops in European waters. The comparison shows that, in Europe, despite... -
Commercial Fishing Rights Allocation in Post-apartheid South Africa: Reconciling Equity and Stability
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: H. Kleinschmidt W. H. H. Sauer P. BritzThe fundamental policy and regulatory framework for a post-apartheid dispensation to manage commercial fisheries in South Africa was put in place with the publication of the White Paper on Marine Fisheries Policy in 1997, and the enactment of the Marine... -
Population Dynamics and Spawning of the Flatfish Solea Bleekeri and Pseudorhombus Arsius in the Intertidal Area of Inhaca Island, Moçambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A. M. P. Van Schie W. F. De BoerThe population dynamics of flatfish Solea bleekeri and Pseudorhombus arsius within the intertidal area of Inhaca Island, Moçambique, was investigated using bottom trawl data collected during summer (December 1996 – March 1997) and winter (June 1997 – August 1997). The... -
An Assessment of the Recreational and Commercial Skiboat Fishery in the Transkei
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S. T. Fennessy A. M. McDonald B. Q. Mann B. I. EverettA survey of the recreational and commercial skiboat linefishery in the Transkei was conducted from March 1997 to April 1999. Effort by commercial skiboats was substantially higher than by recreational skiboats, and catch rates on commercial boats were much higher... -
Evaluation of Participation in and Management of the Transkei Shore Linefishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: B. Q. Mann A. M. McDonald W. H. H. Sauer T. HechtBoth roving creel and aerial surveys were used to quantify fishing effort along the former Transkei coast. A stratified random sampling procedure was used during shore patrols to assess catch and effort, and a questionnaire survey provided information on total... -
Assessment of the Linefishery in Two Urban Estuarine Systems In Kwazulu-natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P. Pradervand L. E. Beckley B. Q. Mann P. V. RadebeThe recreational linefisheries in Durban Harbour and the Mgeni Estuary were surveyed using roving creel and access-point surveys during the period January–December 2000. In total, 3 351 shore-anglers and 652 boat-anglers were checked for catch-and-effort information, and 432 shore-anglers were... -
The Role of Estuaries in South African Fisheries: Economic Importance and Management Implications
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S. J. Lamberth J. K. TurpieExisting catch data for 129 of 255 functional estuaries on the South African coastline were reviewed and the relationships between fish catch and estuary size, type and biogeographical region analysed using simple and multivariate models. The best predictive models were... -
Dynamics of the Fishery for Galjoen Dichistius Capensis, With an Assessment of Monitoring Methods
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C. G. AttwoodThe dynamics of the fishery for galjoen Dichistius capensis were investigated at four sites in South Africa from 1987 to 2000. At three sites, which were protected from fishing, Koppie Alleen, Lekkerwater (both in the De Hoop Marine Protected Area)... -
Under-reporting of Catches of South Coast Rock Lobster Palinurus Gilchristi, with Implications for the Assessment and Management of the Fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J. C. GroeneveldUnder-reporting of fishery catches can severely affect the precision of stock assessment estimates, which require accurate information on catch and catch rate. Under-reporting of catches of South Coast rock lobster Palinurus gilchristi over the past decade was estimated from verified... -
Population Dynamics of the Wandering Albatross Diomedea Exulans at Marion Island: Longline Fishing and Environmental Influences
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D. C. Nel F. Taylor P. G. Ryan J. CooperThe subantarctic Prince Edward Islands (Marion and Prince Edward) support the largest breeding population of the Vulnerable wandering albatross Diomedea exulans. The number of birds breeding at Marion Island has fluctuated over the past three decades apparently as a result... -
Ecosystem approach to fisheries management in the southern Benguela: a workshop overview
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L. J. Shannon K. L. Cochrane C. L. Moloney P. FréonA workshop was held in Cape Town in December 2002 to introduce the concept of an ecosystem approach to fisheries (EAF) management in the southern Benguela, and to examine the options for implementing an EAF in South Africa. The workshop... -
An ecosystem approach to fisheries in the southern Benguela context
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K. L. Cochrane C. J. Augustyn A. C. Cockcroft J. H. M. David M. H. Griffiths J. C. Groeneveld M. R. Lipińnski M. J. Smale C. D. Smith R. J. Q. TarrThe 2001 Reykjavík Declaration on Responsible Fisheries in the Marine Ecosystem and the Plan of Implementation of the 2002 World Summit on Sustainable Development highlighted the need in fisheries to look beyond considering only the target species and to consider... -
Contributions of the Benguela ecology programme to pelagic fisheries management in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C. L. Moloney C. D. Van Der Lingen L. Hutchings J. G. FieldIn 1982, the Benguela Ecology Programme (BEP) created a formal, multi-institutional research partnership in South Africa. During the next two decades, the BEP directed many aspects of pelagic ecosystem research in the southern Benguela upwelling region, aiming to improve fisheries... -
A brief introduction to some approaches to multispecies/ecosystem modelling in the context of their possible application in the management of South African fisheries
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D. S. Butterworth É. E. PlagányiAspects of the potential application of multispecies/ecosystem modelling to advise the management of South African fisheries are discussed. In general, reliable predictive ability from such models is likely to be achieved sooner for top predators, because relatively fewer links need... -
An ecosystem framework for fisheries management in the southern Benguela upwelling system
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L. J. Shannon C. L. MoloneyA "four-step framework" for applying ecosystem approaches to fisheries management in the southern Benguela is proposed. First, static ecosystem models can be used to highlight important interactions by assessing the net trophic impacts of each species on all the others... -
Ecosystem approach to fisheries management in the northern Benguela: the Namibian experience
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J-P. Roux L. J. ShannonThe northern Benguela marine resources have a long history of questionable management primarily because of the limitations of management measures under the political framework of the time (either free access or under an international authority with no national representation, authority... -
Simulations of fishing effects on the southern Benguela fish community using an individual-based model: learning from a comparison with ECOSIM
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: Y-J. Shin L. J. Shannon P. M. CuryBy applying an individual-based model (OSMOSE) to the southern Benguela ecosystem, a multispecies analysis is proposed, complementary to that provided by the application of ECOPATH/ECOSIM models. To reconstruct marine foodwebs, OSMOSE is based on the hypothesis that predation is a... -
Distribution patterns of key fish species of the southern Benguela ecosystem: an approach combining fishery-dependent and fishery-independent data
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L. Pecquerie L. Drapeau P. Fréon J. C. Coetzee R. W. Leslie M. H. GriffithsWithin the context of an ecosystem approach for fisheries, there is a need for quantitative information on distributions of key marine species. This information is valuable input for modelling species interactions in the southern Benguela ecosystem. In the present study,... -
Effects of fishing on the size and dominance structure of linefish of the Cape region, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D. Yemane J. G. Field M. H. GriffithsA dataset of linefish catch, effort and fish size distribution records has been assembled from archives to cover three short periods over the 100 years from 1897 to 1998 in four regions of the former Cape Colony, South Africa. Linefish... -
Modelling stock dynamics in the southern Benguela ecosystem for the period 1978–2002
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L. J. Shannon V. Christensen C. J. WaltersAn ecosystem model of the southern Benguela was fitted to available time-series data for the period 1978–2002, to explore how changes in target fish populations in this ecosystem can be attributed to feeding interaction terms and population control patterns, the... -
Accounting for food requirements of seabirds in fisheries management – the case of the South African purse-seine fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R. J. M. CrawfordIn South Africa, four of the seabirds that feed mainly on sardine Sardinops sagax and anchovy Engraulis encrasicolus have an unfavourable conservation status or a small population: African penguin Spheniscus demersus, Cape gannet Morus capensis, Cape cormorant Phalacrocorax capensis and... -
A critical look at the potential of Ecopath with ecosim to assist in practical fisheries management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: É. E. Plagányi D. S. ButterworthEcosystem-orientated thinking is increasingly incorporated into fishery management. Given the complexity of ecosystem processes, there is a need to evaluate the tools used to steer this thinking critically. ECOPATH with ECOSIM (EwE), an aggregate system-modelling package, is currently the most... -
Review of indicators in fisheries management – a development perspective
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P. Degnbol A. JarreA review of indicators for an ecosystem approach to fisheries management is presented, focusing on multispecies fisheries and limited resources for assessments and implementation, as often is the case in developing countries. Emphasizing the need to link indicators to management... -
Estimating the lipid content of pelagic fish in the southern Benguela by visual assessment of their mesenteric fat
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CD van der Lingen L HutchingsA technique to estimate the lipid content of anchovy Engraulis encrasicolus and sardine Sardinops sagax using visual assessments of mesenteric fat is described. Anchovy are allocated to one of five and sardine to one of seven fat stages, depending upon... -
The biology and distribution of the monkfish Lophius vomerinus off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SA Walmsley RW Leslie WHH SauerThe monkfish Lophius vomerinus is economically the most important bycatch species in the South African demersal hake fishery. To assist in the development of a bycatch management plan for the species, age and growth characteristics, reproductive and feeding biology, and... -
Preliminary documentation and assessment of fish diversity in sub-Saharan African estuaries
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AK WhitfieldLists of indigenous fish species sampled in cool-temperate, warm-temperate, subtropical and tropical estuaries in sub-Saharan Africa were compiled from both published and unpublished data. Comparisons were conducted at the species and family level between the fish assemblages recorded in the... -
A telemetry experiment on spotted grunter Pomadasys commersonnii in an African estuary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SE Kerwath A Götz PD Cowley WHH Sauer C AttwoodThe feasibility of using telemetry equipment to study the movements of estuarine-associated fish in South Africa was investigated by conducting a tracking experiment on spotted grunter Pomadasys commersonnii in the East Kleinemonde Estuary. The telemetry equipment comprised two VEMCO V8... -
Food habits of some deep-sea fish off South Africa's west coast and Agulhas Bank. 1. The grenadiers (Teleostei: Macrouridae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ME AndersonThe food habits of 10 species of grenadier collected from the upper continental slope off South Africa's west coast and Agulhas Bank are described. Three feeding strategies were identified. Members of the demersal micro- or mesocarnivore feeding guild and grazer... -
Wintering seabirds in West Africa: foraging hotspots off Western Sahara and Mauritania driven by upwelling and fisheries
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CJ Camphuysen J van der MeerCold-water upwelling supports abundant and diverse faunas. Upwelling off Mauritania has been highlighted as being important for seabirds, but very few systematic offshore surveys have been conducted in that region. Mauritanian waters are increasingly targeted by commercial fisheries along the... -
Bayesian analysis of allozyme markers indicates a single genetic population of kingklip Genypterus capensis off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WS Grant RW LeslieKingklip Genypterus capensis inhabit deep continental shelf and slope waters off southern Africa and are now largely harvested as a bycatch in trawl and longline fisheries for Cape hakes Merluccius spp. Regional differences in growth, vertebral count and otolith morphology... -
Food habits of some deep-sea fish off South Africa's west coast. 2. Eels and spiny eels (Anguilliformes and Notacanthiformes)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ME AndersonThe food habits of five species of eels and one species of spiny eel collected from the upper continental slope off the Cape west coast and Agulhas Bank, South Africa, are described. All a re embers of a defined demersal... -
An economic comparison of the commercial and recreational linefisheries in Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Stage CH KirchnerThe most important Namibian linefish species, the silver kob Argyrosomus inodorus, is currently heavily exploited, and in order to ensure its survival catch restrictions are being introduced. However, kob are exploit ed oth by recreational anglers and by commercial vessels,... -
Influence of oceanographic fronts and low oxygen on the distribution of ichthyoplankton in the Benguela and southern Angola currents
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: W Ekau HM VerheyeThe study focuses on ichthyoplankton populations in the southern Angola Current, the Angola-Benguela Front and the coastal upwelling area of the northern and central Benguela Current. The horizontal and vertical distributions of eggs and larvae of sardine Sardinops sagax, anchovy... -
Validation of the periodicity of opaque zone formation in the otoliths of four temperate reef fish from South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WM Potts PD CowleyAn oxytetracycline (OTC) marker was used to validate the periodicity of opaque zone deposition in the otoliths of Chrysoblephus laticeps, Cheimerius nufar, Cymatoceps nasutus (Sparidae) and Dichistius capensis (Dichistiidae) in the wild. Fish were injected with OTC and tagged with... -
Tropical South-East Atlantic response to ENSO as an ecosystem indicator for the southern Benguela
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MR JuryThe response of the tropical South-East Atlantic Ocean to the El Niño Southern Oscillation (ENSO) was studied for the period 1950–1999. Interaction between the ocean thermocline 'see-saw' and the overlying zonal wind circulation was examined. The two are closely linked... -
How can science contribute to an ecosystem approach to pelagic, demersal and rock lobster fisheries in South Africa?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LJ Shannon PM Cury D Nel CD Van Der Lingen RW Leslie SL Brouwer AC Cockcroft L HutchingsSouth Africa is committed to moving towards an Ecosystem Approach to Fisheries (EAF) and has laid the foundations for this using a three-pronged approach: through a project (EAF Feasibility Study) under the Benguela Current Large Marine Ecosystem Programme; through a... -
Occurrence and predominance of the fish killer Cochlodinium polykrikoides on the Pacific coast of Costa Rica
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Vargas-Montero E Freer R Jiménez-Montealegre JC GuzmánWater samples were collected at several points along the Pacific coast of Costa Rica (10°00'N, 84°15'E) fortnightly from January 2003 to June 2004. During this period, dense red-ochre discolourations dominated by Cochlodinium polykrikoides were observed, particularly over the dry season... -
Analytical detection of parasite infection of Dinophysis norvegica using FISH probes
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PS Salomon S Janson L-Å Gisselson E GranéliParasites of the genus Amoebophrya infect several free-living dinoflagellates, including harmful species. Whereas advanced infection can be easily detected, earlier stages of infection are more difficult to establish. rRNA-based fluorescent in situ hybridisation (FISH) probes specific to Amoebophrya sp. infecting... -
Examining the 'global spreading hypothesis' using graph theory
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: F Jordán T WyattA persistent view, called the 'global spreading hypothesis', maintains that the frequency, magnitude and geographical extent of harmful algal blooms have increased in recent decades. These putative trends have been variously attributed to nutrient enrichment, climate change and inadequate databases... -
Detection methods and their limitations: PSP toxins in the southern puffer fish Sphoeroides nephelus responsible for human poisoning events in Florida in 2004
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Etheridge J Deeds S Hall K White L Flewelling J Abbott J Landsberg S Conrad D Bodager G JackowHigh-performance liquid chromatography (HPLC) with post-column derivatisation and fluorescence detection has been commonly used for analysing paralytic shellfish poisoning (PSP) toxins. However, identifying peaks with confidence requires that steps be taken beyond simple chromatographic runs, owing in part to the... -
Toxicological requirements for risk assessment of shellfish contaminants: a review
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R MundayThere is increasing concern by consumers with regard to the health aspects and safety of foodstuffs. Most food additives and contaminants are controlled by regulatory authorities, with Acceptable Daily Intakes (ADIs) having been set on the basis of detailed acute... -
Towards the declaration of a large marine protected area: a subtidal ichthyofaunal survey of the Pondoland coast in the Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann L Celliers ST Fennessy S Bailey AD WoodA subtidal marine ichthyofaunal survey was carried out on shallow reefs (1–30m deep) in the Pondoland region between the Mtamvuna River and Port St Johns in the Eastern Cape, South Africa. The purpose of this survey was to provide the... -
Shark fishing effort and catch of the ragged-tooth shark Carcharias taurus in the South African competitive shore-angling fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ML Dicken MJ Smale AJ BoothAn integrated telephone and on-site questionnaire survey was used to estimate total shark fishing effort and specific catch of the ragged-tooth shark Carcharias taurus by coastal club-affiliated shore-anglers, primarily along the east coast of South Africa. Mean total shark fishing... -
Spatial and seasonal distribution patterns of the ragged-tooth shark Carcharias taurus along the coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ML Dicken MJ Smale AJ BoothCatches from competitive shore-anglers, inshore boat-based anglers and sightings by spearfishers and divers were used to infer the spatial and seasonal movement patterns of young-of-the-year (<1.2m TL), juvenile (1.2–1.8m TL), sub-adult (1.8–2.4m TL) and adult (>2.4m TL) ragged-tooth sharks Carcharias... -
Geomorphological and managerial implications of fish trapping in the Kosi Bay Estuary, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AN Green GG Garland R UkenThe tidal basin of the Kosi Bay lagoonal-lacustrine complex is dominated by fish traps that line the intertidal and subtidal environments. These have been considered significant sediment sinks, responsible for transformation of parts of the system from subtidal and intertidal... -
A knowledge base for management of the capital-intensive fishery for small pelagic fish off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TP Fairweather M Hara CD van der Lingen J Raakjær LJ Shannon GG Louw P Degnbol RJM CrawfordAs a contribution to South Africa's move towards an ecosystem approach to fisheries management, this study explores the existence of common perceptions about South Africa's pelagic fishery between resource users and scientists. It represents a collaborative research effort of social... -
Abundance, biomass and species composition of nearshore fish assemblages in Ghana, West Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: FKE Nunoo DB Eggleston CJ VanderpuyeMany of the world's fish populations are overexploited, including Ghana's fish resources. This study examines spatio-temporal trends in fish species composition in relation to biotic, abiotic and anthropogenic factors, towards achieving better-informed management of the beach-seine fisheries. Fishery-dependent data were... -
Few data but many fish: marine small-scale fisheries catches for Mozambique and Tanzania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Jacquet --- Sea Around Us Project, Fisheries Centre, Canada H Fox --- Conservation Science Program, USA H Motta --- WWF Mozambique Coordination Office, Mozambique A Ngusaru --- EAME Programme, WWF-Tanzania Programme Office, Tanzania D Zeller --- Sea Around Us Project, Fisheries Centre, CanadaThe fisheries data supplied to the Food and Agriculture Organization of the United Nations (FAO) by national agencies have served as the primary tool for many global and regional studies. However, it is recognised that these data are incomplete and... -
A spatial- and age-structured assessment model to estimate the impact of illegal fishing and ecosystem change on the South African abalone Haliotis midae resource
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ÉE Plagányi --- Department of Mathematics and Applied Mathematics, South Africa DS Butterworth --- Department of Mathematics and Applied Mathematics, South AfricaThe management of abalone stocks worldwide is complicated by factors such as illegal fishing combined with the difficulties of assessing a sedentary (but not immobile) resource that is often patchily distributed. The South African abalone Haliotis midae fishery is faced... -
The biology, life history and management needs of a large sciaenid fish, Argyrosomus coronus, in Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WM Potts --- Department of Ichthyology and Fisheries Science, PO Box 94, South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, PO Box 94, South Africa R Henriques --- School of Biological Sciences, UK S Sequesseque --- , Angola CV Santos --- , Angola PW Shaw --- School of Biological Sciences, UKThe West Coast dusky kob Argyrosomus coronus is an understudied yet important fishery species in Angola. During a five-year study (2005–2009), the species was recorded in all fishery sectors, but was most important in the inshore recreational fishery in southern... -
Influence of the sardine run on selected nearshore predatory teleosts in KwaZulu-Natal
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ST Fennessy --- , South Africa P Pradervand --- , New Zealand PA de Bruyn --- , SpainThe relationships between shore-angling catch rates of nearshore predatory teleosts in KwaZulu-Natal, South Africa, and the timing of the sardine run were examined using a multiple regression model. Results showed that catch rates of five (elf Pomatomus saltatrix, garrick Lichia... -
Temporal changes in kelp forest benthic communities following an invasion by the rock lobster Jasus lalandii
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LK Blamey --- , South Africa GM Branch --- , South Africa KE Reaugh-Flower --- , South AfricaThe rock lobster Jasus lalandii expanded its centre of distribution south-eastwards into an area known as ‘East of Cape Hangklip’ on the south-west coast of South Africa in the early 1990s. Using historical and present data, we analysed differences in... -
The ichthyofauna in the Port of Ngqura, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ML Dicken --- Department of Development Studies, School of Economics, Development and Tourism, South AfricaThis study provides one of the first quantitative assessments of a fish community within a pre-operational deep-water port system. Between September 2006 and September 2007 a total of 4 559 fish, representing 47 species and 27 different families, were caught... -
Assessment of South African Umbrina robinsoni based on per-recruit models
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Hutchings --- Zoology Department and Marine Biology Research Centre, South Africa MH Griffiths --- Ministry of Fisheries, New ZealandSlender baardman Umbrina robinsoni are an important component of recreational shore-angler and spearfisher catches along the eastern seaboard of South Africa. Stocks of U. robinsoni at three sites—False Bay, Stil Bay and the KwaZulu-Natal (KZN) coast—were modelled using a per-recruit... -
Alongshore distribution and abundance of fish larvae off the coast of Kenya
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J.M. Mwaluma --- , Kenya B. Kaunda-Arara --- Department of Fisheries and Aquatic Sciences, Kenya J. Rasowo --- Department of Biological Sciences, KenyaKnowledge is limited on the fish larval assemblage in shallow lagoonal reefs along the Kenyan coast. Fish larvae from five lagoons, spanning 120 km on the Kenyan coast, were sampled in March 2007 and April 2008 to compare interannual spatial... -
Characteristics and value of the Thukela Banks crustacean and linefish fisheries, and the potential impacts of changes in river flow
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JK Turpie --- Anchor Environmental Consultants, South Africa SJ Lamberth --- Branch Fisheries, Department of Agriculture, Forestry and Fisheries, South AfricaThis study describes the Thukela Banks crustacean and linefish fisheries and investigates the potential impacts of reduced flow from the Thukela River on the value of these fisheries. Data were obtained from published and unpublished material, key informants and government... -
Effect of dietary protein to energy ratio on growth and nitrogenous waste production of cultured dusky kob Argyrosomus japonicus
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LD Woolley --- Department of Ichthyology and Fisheries Science, South Africa CLW Jones --- Department of Ichthyology and Fisheries Science, South Africa PJ Britz --- Department of Ichthyology and Fisheries Science, South AfricaThe effect of dietary protein to energy ratio (P:E) on the growth of dusky kob Argyrosomus japoni-cus was investigated as a first step towards formulating a practical diet for this potential mariculture species in South Africa. The effects of dietary... -
Modelling regime shifts in the southern Benguela: a frame-based approach
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MD Smith --- Marine Research (MA-RE) Institute and Zoology Department, South Africa A Jarre --- Marine Research (MA-RE) Institute and Zoology Department, South AfricaThis study explores the usefulness of a frame-based modelling approach in the southern Benguela upwelling ecosystem, with four frames describing observed small pelagic fish dominance patterns. We modelled the dynamics of sardine Sardinops sagax and anchovy Engraulis encrasicolus populations under... -
An alternative method for estimating the status of resident reef fish stocks, based on differential fishing effort across a marine reserve boundary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Götz --- Elwandle Node, South Africa SE Kerwath --- Branch Fisheries, Department of Agriculture, South Africa CG Attwood --- Marine Research Institute, Zoology Department, South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, South AfricaThe stock status of roman Chrysoblephus laticeps was estimated in the Goukamma, a temperate South African marine protected area (MPA). Standardised catch per unit effort (CPUE) from a controlled angling survey on both sides of the MPA border was employed... -
Changes in demersal fish assemblages on the west coast of South Africa, 1986–2009
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LJ Atkinson --- , South Africa RW Leslie --- Fisheries Branch, Department of Agriculture, South Africa JG Field --- , South Africa A Jarre --- , South AfricaResearch survey data collected over 24 years (1986–2009) were used to explore long-term changes in demersal fish assemblages on the west coast of South Africa. Differences in spatial (latitude and depth) and temporal (seasonal and annual) factors were examined using... -
Noteworthy elasmobranch records from Oman
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AC Henderson --- Department of Marine Science and Fisheries, Sultanate of Oman AJ ReeveRecords of 11 elasmobranch species previously unreported from, or uncommon in, Omani waters are presented. Records new to Oman include Carcharhinus altimus, C. leiodon, Centrophorus isodon, Ctenacis fehlmanni, Himantura fai, Mobula eregoodootenke and Sphyrna zygaena, whereas noteworthy records of uncommon... -
Biology, fisheries and distribution of Thryssa vitrirostris (Gilchrist & Thompson 1908) and other Engraulidae along the coast of the Sofala Bank, western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Mualeque --- , Mozambique J Santos --- Faculty of Biosciences, Fisheries and Economics, NorwayThe Sofala Bank (16°–21° S) forms a major discontinuity in the gradients of engraulid distribution along the south-eastern African coast. Although the number of species declines southwards, the density and the catches of species associated with higher turbidity increases within... -
Comparison of the population structure and life-history parameters of Diplodus capensis (Sparidae) in exploited and unexploited areas of southern Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TJ Richardson --- Department of Ichthyology and Fisheries Science, PO Box 94, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, PO Box 94, South Africa CV Santos --- , Angola WHH Sauer --- Department of Ichthyology and Fisheries Science, PO Box 94, South AfricaBlacktail seabream Diplodus capensis were sampled from proximate (10 km apart) exploited and unexploited areas in southern Angola to compare their population structures and life-history parameters. Females dominated the larger size and older age classes in the unexploited area. In... -
Analysing environmental and fishing effects on a short-lived species stock: the dynamics of the octopus Octopus vulgaris population in Senegalese waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Thiaw --- , Sénégal D Gascuel --- , France D Thiao --- , Sénégal OT Thiaw --- , Sénégal D Jouffre --- , SénégalShort-lived species are extremely dependent on the seasonal and interannual variability of environmental conditions, and determining their stock status is often difficult. This study investigates the effects of environmental variability and fishing pressure on the stock of octopus Octopus vulgaris... -
Integrated culture of silver kob Argyrosomus inodorus and bloodworm Arenicola loveni loveni in abalone farm effluent
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RD Yearsley --- Department of Ichthyology and Fisheries Science, South Africa CLW Jones --- Department of Ichthyology and Fisheries Science, South Africa PJ Britz --- Department of Ichthyology and Fisheries Science, South Africa NG Vine --- Department of Ichthyology and Fisheries Science, South AfricaSouth African abalone Haliotis midae farms utilise large volumes of seawater (c. 500–1 500 l s–1) and produce relatively dilute effluents that are potentially suitable for the integrated culture of other species. To test this hypothesis, a marine finfish, silver... -
Accumulation of diarrhetic shellfish poisoning toxins in the oyster Crassostrea gigas and the mussel Choromytilus meridionalis in the southern Benguela ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GC Pitcher --- Branch: Fisheries Management, Department of Agriculture, South Africa B Krock --- , Germany AD Cembella --- , GermanyDiarrhetic shellfish poisoning (DSP) poses a significant threat to the safe consumption of shellfish in the southern Benguela ecosystem. The accumulation of DSP toxins was investigated in two cultivated bivalve species, the Pacific oyster Crassostrea gigas and the mussel Choromytilus... -
Investigations into the diet and feeding ecology of the bearded goby Sufflogobius bibarbatus off Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RB Cedras --- Department of Biodiversity and Conservation Biology, South Africa A-GV Salvanes --- Department of Biology, Norway MJ Gibbons --- Department of Biodiversity and Conservation Biology, South AfricaThe bearded goby Sufflogobius bibarbatus has come to replace sardine Sardinops sagax in the diets of many top predators within the marine environment off Namibia, and it is playing a key role within the region's foodweb. Previously published information on... -
New perspectives in small-scale fisheries management: challenges and prospects for implementation in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Sowman --- Environmental Evaluation Unit, South AfricaWorldwide, the past 15–20 years has seen a significant shift in thinking and approaches to the management of small-scale fisheries. This is in response to the recognition that conventional fisheries management is not equipped to deal with the complexities, uncertainties... -
Trends and interventions in large whale entanglement along the South African coast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MA Meÿer --- Department of Environmental Affairs, South Africa PB Best --- , South Africa MD Anderson-Reade --- , South Africa G Cliff --- , South Africa SFJ Dudley --- , South Africa SP Kirkman --- Department of Environmental Affairs, South AfricaThe major causes of large whale entanglement in South Africa are static fishing gear, especially the type associated with the West Coast rock lobster Jasus lalandii industry, and large-mesh gillnets that are set off the coast of KwaZulu-Natal (KZN) to... -
Area-use patterns and diel movements of white steenbras Lithognathus lithognathus in a temporarily open/closed South African estuary, inferred from acoustic telemetry and long-term seine-netting data
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RH Bennett --- Department of Ichthyology and Fisheries Science, South Africa PD Cowley --- , South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa AK Whitfield --- , South AfricaAcoustic telemetry and long-term seine-netting data were used to assess distribution, area use, home range dynamics and movement patterns of estuarine-dependent juvenile white steenbras Lithognathus lithognathus in the temporarily open/closed East Kleinemonde Estuary. Using 15 years of biannual seine-netting data,... -
A review of the ecology and management of temporarily open/closed estuaries in South Africa, with particular emphasis on river flow and mouth state as primary drivers of these systems
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AK Whitfield --- , South Africa GC Bate --- Department of Botany, South Africa JB Adams --- Department of Botany, South Africa PD Cowley --- , South Africa PW Froneman --- Department of Zoology and Entomology, South Africa PT Gama --- Department of Botany, South Africa NA Strydom --- Department of Zoology, South Africa S Taljaard --- , South Africa AK Theron --- , South Africa JK Turpie --- , South Africa L van Niekerk --- , South Africa TH Wooldridge --- Department of Zoology, South AfricaResearch in South African temporarily open/closed estuaries that includes studies on the hydrodynamics, sediment dynamics, macronutrients, microalgae, macrophytes, zoobenthos, hyperbenthos, zooplankton, ichthyoplankton, fishes and birds is used as a basis to review the ecology and management of this estuary type... -
Assessing the ecosystem effects of the abalone Haliotis midae from its diet and foraging behaviour
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: Z Zeeman --- Department of Zoology and Marine Research Institute, South Africa GM Branch --- Department of Zoology and Marine Research Institute, South Africa TP Peschak --- Department of Zoology and Marine Research Institute, South Africa D Pillay --- Department of Zoology and Marine Research Institute, South AfricaThe South African abalone Haliotis midae is commercially exploited and seriously threatened by overfishing. This not only affects the species itself but potentially the functioning of the ecosystem because of associated changes in community structure. The nature of effects that... -
A characterisation of the paddle-ski fishery in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- , South Africa P Pradervand --- , South Africa JQ Maggs --- , South Africa S Wintner --- , South AfricaThe KwaZulu-Natal (KZN) paddle-ski fishery in South Africa consists mainly of light-weight fishing kayaks operated by a single fisher in the marine nearshore environment. The social, economic, management and fisheries parameters of this sector were investigated during the period December... -
Temporal and spatial patterns in the abundance of jellyfish in the northern Benguela upwelling ecosystem and their link to thwarted pelagic fishery recovery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BA Flynn --- Department of Biodiversity and Conservation Biology, South Africa AJ Richardson --- Climate Adaptation Flagship, CSIRO Marine and Atmospheric Research, Australia AS Brierley --- Pelagic Ecology Research Group, Scottish Oceans Institute, UK DC Boyer --- National Marine Information and Research Centre (NatMIRC), Namibia BE Axelsen --- , Norway L Scott --- , South Africa NE Moroff --- National Marine Information and Research Centre (NatMIRC), Namibia PI Kainge --- National Marine Information and Research Centre (NatMIRC), Namibia BM Tjizoo --- National Marine Information and Research Centre (NatMIRC), Namibia MJ Gibbons --- Department of Biodiversity and Conservation Biology, South AfricaThere has been debate in the literature about whether jellyfish abundance has increased in the northern Benguela upwelling system, or not, over the past five decades and what impact they are having on pelagic fish. Here we review old expedition... -
Effects of chemicals from longline baits on the biting behaviour of loggerhead sea turtles
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Piovano --- Dipartimento di Biologia Animale e dell'Uomo, Italy A Farcomeni --- Dipartimento di Sanità Pubblica e Malattie Infettive, Italy C Giacoma --- Dipartimento di Biologia Animale e dell'Uomo, ItalyThe biting behaviour of the loggerhead sea turtle Caretta caretta, a high bycatch species by longline fishing gear, was studied on 30 wild specimens held temporarily at rescue centres. To account for repeated measures, the data were analysed using mixed-effects... -
Catch-and-release angling mortality of south-eastern Australian Pomatomus saltatrix
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MK Broadhurst --- NSW Department of Primary Industries, Fisheries Conservation Technology Unit, Australia PA Butcher --- NSW Department of Primary Industries, Fisheries Conservation Technology Unit, Australia BR Cullis --- School of Mathematics and Applied Statistics, Faculty of Informatics, AustraliaPomatomus saltatrix (Pomatomidae) is important to several recreational fisheries around the world, most of which regulate exploitation via legal size limits and quotas. However, the inherent assumption of minimal impacts to released P. saltatrix has only been tested across limited... -
Records of poorly known batoid fishes from the north-western Indian Ocean (Chondrichthyes: Rhynchobatidae, Rhinobatidae, Dasyatidae, Mobulidae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ABM Moore --- School of Ocean Sciences, UKRecords are presented of several species of batoid fish from the north-western Indian Ocean that are poorly known, of taxonomic interest, or of conservation concern. For the Persian (Arabian) Gulf, the first records of Rhinobatos halavi, Himantura fai, and the... -
Chromosomal population structuring in carangids (Perciformes) between the north-eastern and south-eastern coasts of Brazil
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: IV Accioly --- Departamento de Biologia Celular e Genética, Centro de Biociências, Brasil LAC Bertollo --- Departamento de Genética e Evolução, Brasil GWWF Costa --- Departamento de Biologia Celular e Genética, Centro de Biociências, Brasil UP Jacobina --- Departamento de Biologia Celular e Genética, Centro de Biociências, Brasil WF Molina --- Departamento de Biologia Celular e Genética, Centro de Biociências, BrasilThe family Carangidae comprises 151 species, of which only 19 have been so far karyotyped, including a few representatives from the Western Atlantic Ocean. This study compared the cytogenetic features of three Atlantic carangids, Chloroscombrus chrysurus, Trachinotus goodei and T... -
St Helena Bay (southern Benguela) then and now: muted climate signals, large human impact
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Hutchings --- Department of Environmental Affairs, South Africa A Jarre --- Marine Research (MA-RE) Institute, South Africa T Lamont --- Department of Environmental Affairs, South Africa M van den Berg --- Department of Environmental Affairs, South Africa SP Kirkman --- Department of Environmental Affairs, South AfricaThe development of suitable reference states for ecosystem-based management requires documentation of changes in structure and functioning of marine ecosystems, including assessment of the relative importance of bottom-up and top-down processes as drivers of change. We used monitoring data available... -
Long-term trends in the recreational shore-fishery for elf Pomatomus saltatrix (Pomatomidae) along the KwaZulu-Natal coast, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JQ Maggs --- , South Africa BQ Mann --- , South Africa RP van der Elst --- , South AfricaElf Pomatomus saltatrix account for between 28% and 80% of the annually recorded recreational shore-angling catch in KwaZulu-Natal, South Africa, and have been subjected to various management regimes over the past 33 years. Management of the elf fishery was amended... -
A hard-knock life: the foraging ecology of Cape cormorants amidst shifting prey resources and industrial fishing pressure
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MH Hamann --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa D Grémillet --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa PG Ryan --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa F Bonadonna --- , France CD van der Lingen --- Department of Agriculture, Forestry and Fisheries, South Africa L Pichegru --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South AfricaOnce one of the most numerous seabirds of the Benguela upwelling system, the population of Cape cormorants Phalacrocorax capensis has decreased by 60% in the past three decades and the species is listed as Near Threatened. Declines in prey availability... -
Long-term catch and effort trends in Eastern Cape Angling Week competitions
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ML Dicken --- Department of Ichthyology and Fisheries Science, South Africa MJ Smale --- Department of Zoology, South Africa AJ Booth --- Department of Ichthyology and Fisheries Science, South AfricaCatches from Angling Week competitions between 1999 and 2010 were analysed to examine changes in catch and effort. Over the course of the study period there was a marked drop in the number of competing anglers and a significant reduction... -
Comparing fish communities in sanctuaries, partly protected areas and open-access reefs in South-East Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Currie --- Department of Zoology, South Africa KJ Sink --- , South Africa P Le Noury --- , South Africa GM Branch --- Department of Zoology, South AfricaFish were surveyed by visual census on offshore reefs in Mozambique and eastern South Africa to compare (a) fully-protected ‘sanctuary’ areas, (b) ‘partly protected’ areas where recreational diving and limited fishing are permitted, and (c) ‘open’ unprotected areas. Community composition... -
Fishing methods for sustainable shrimp fisheries in the Canary Islands (North-West Africa)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Arrasate-López --- , Spain VM Tuset --- , Spain JI Santana --- , Spain A García-Mederos --- , Spain O Ayza --- , Spain JA González --- , SpainDuring the past 20 years, experimental cruises have been conducted around the Canary Islands (North-West Africa) to investigate the biodiversity of the deep-sea ecosystem and to explore new fisheries resources. Although pandalid shrimps were shown to be very abundant in... -
An assessment of participation, catch and effort in the KwaZulu-Natal shore-based marine linefishery, with comments on management effectiveness
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SW Dunlop --- , South Africa BQ Mann --- , South AfricaThe primary purpose of this study was to evaluate the effectiveness of current management of the KwaZulu-Natal (KZN) shore-based marine linefishery. Methods used included a stratified-random creel survey and an associated questionnaire survey. The study was undertaken between February 2009... -
Significant population genetic structuring of the holoplanktic scyphozoan Pelagia noctiluca in the Atlantic Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BJ Miller --- Evolutionary Genomics Group, Department of Botany and Zoology, South Africa S von der Heyden --- Evolutionary Genomics Group, Department of Botany and Zoology, South Africa MJ Gibbons --- Department of Biodiversity and Conservation Biology, South AfricaPelagia noctiluca is thought to have a global distribution, yet our understanding of genetic connectivity across the range of this problem animal is poor. Here, we investigate the genetic structure of populations off southern Africa using mitochondrial COI and nuclear... -
From biomass mining to sustainable fishing — using abundance and size to define a spatial management framework for deep-water lobster
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Groeneveld --- , South Africa SP Kirkman --- Department of Environmental Affairs, South Africa M Boucher --- Marine Biology Research Institute, Department of Zoology, South Africa D Yemane --- Branch: Fisheries, Department of Agriculture, South AfricaBased on the assumption that depleted stocks would have recovered during a six-year layoff from fishing, trapping for deep-water spiny lobster Palinurus delagoae and slipper lobster Scyllarides elisabethae off eastern South Africa resumed in 2004 until 2007. A generalised linear... -
Evidence of deep genetic divergence between populations of an important recreational fishery species, Lichia amia L. 1758, around southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Henriques --- Centre for Ecology, Evolution and Behaviour, School of Biological Sciences, UK WM Potts --- Department of Ichthyology and Fisheries Science, South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, South Africa PW Shaw --- Institute of Biological, Environmental and Rural Sciences (IBRS), UKLichia amia is an important coastal recreational fishery species with a cosmopolitan distribution in the eastern Atlantic. In southern Africa, it is distributed from southern Angola to northern KwaZulu-Natal in South Africa. A recent biological survey revealed differences between Angolan... -
Thirty years of monitoring traditional fish trap catches at Kosi Bay, KwaZulu-Natal, South Africa, and management implications
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Kyle --- , South AfricaThe catches of the traditional fish traps in the Kosi Bay estuarine lakes were monitored over a 30-year period from 1981 to 2010. Monitoring data were used to provide estimates of, and insights into, catch size and species composition as... -
A first description of the artisanal shark fishery in northern Madagascar: implications for management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Robinson --- Department of Ichthyology and Fisheries Science, South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, South AfricaIn the past two decades, small, targeted artisanal shark fisheries have developed in the extreme north of Madagascar, largely in response to the shark fin trade. Few studies have been undertaken to assess the biological characteristics and impact of these... -
An assessment of participation, catch and effort in the offshore boat-based linefishery in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SW Dunlop --- , South Africa BQ Mann --- , South AfricaThis study evaluates trends in participation, catch and effort in the KwaZulu-Natal offshore boat-based linefishery. Methods used included a random access-point survey and an associated questionnaire survey. The study was undertaken between February 2009 and April 2010. Total participation in... -
A spatio-temporal assessment of the Trachinotus botla shore-fishery in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Parker --- Department of Ichthyology and Fisheries Science, South Africa AJ Booth --- Department of Ichthyology and Fisheries Science, South Africa BQ Mann --- , South AfricaThe shore-fishery for Trachinotus botla in KwaZulu-Natal appears to be in a stable state. A per-recruit assessment showed that the species is currently underexploited (spawner biomass-per-recruit = 75% of pristine levels) and that fishing mortality could theoretically be increased. The... -
A review of the Oceanographic Research Institute's Cooperative Fish Tagging Project: 27 years down the line
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SW Dunlop --- , South Africa BQ Mann --- , South Africa RP van der Elst --- , South AfricaThe Oceanographic Research Institute's (ORI) Cooperative Fish Tagging Project was initiated in 1984 and is one of the most enduring and successful environmental projects of its kind in South Africa. By the end of 2011, 5 130 anglers had joined... -
Quantifying the degree of protection afforded by a no-take marine reserve on an exploited shark
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C da Silva --- Fisheries Research, Department of Agriculture, South Africa SE Kerwath --- Fisheries Research, Department of Agriculture, South Africa CG Attwood --- Marine Research Institute, Zoology Department, South Africa EB Thorstad --- , Norway PD Cowley --- , South Africa F Økland --- , Norway CG Wilke --- Fisheries Research, Department of Agriculture, South Africa TF Næsje --- , NorwaySharks have been shown to benefit from the protection of marine protected areas (MPAs). There is, however, little information on the degree of protection by MPAs to shark populations. The movements of individual smoothhound sharks Mustelus mustelus in, and adjacent... -
Identifying management preferences, institutional organisational rules, and their capacity to improve fisheries management in Pemba, Mozambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TR McClanahan --- , USA JE Cinner --- ARC Centre of Excellence for Coral Reef Studies, Australia C Abunge --- , USAThe potential to improve the management of fisheries in Pemba, Mozambique, were explored by evaluating stakeholder's preferences for management and the key institutional design elements of the fisheries organisations or community councils of fisheries (CCPs). We interviewed fishers, community leaders... -
The trouble with estuarine fisheries in temperate South Africa, illustrated by a case study on the Sundays Estuary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PD Cowley --- South African Institute for Aquatic Biodiversity, South Africa A-R Childs --- South African Institute for Aquatic Biodiversity, South Africa RH Bennett --- South African Institute for Aquatic Biodiversity, South AfricaThis study provides empirical data on the exploitation of fishery resources on the Sundays Estuary on the south-east coast of South Africa. Total annual effort was estimated at 63 785 angler-hours, which accounted for an annual yield of 16 214... -
Reproductive biology of the milk shark Rhizoprionodon acutus (Carcharhinidae) off the coast of Senegal
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Ba --- Département de Biologie Animale, Faculté des Sciences et Techniques, Senegal CT Ba --- Département de Biologie Animale, Faculté des Sciences et Techniques, Senegal K Diouf --- , Senegal PI Ndiaye --- Département de Biologie Animale, Faculté des Sciences et Techniques, Senegal J Panfili --- , SenegalDespite the considerable commercial value of the milk shark Rhizoprionodon acutus (Rüppell 1837) along the Senegal coast, there are few data on its biology. Milk sharks examined in this study were caught by small-scale fisheries on the Senegalese coast from... -
Reef fish display station-keeping and ranging behaviour in the Pondoland Marine Protected Area on the east coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JQ Maggs --- , South Africa BQ Mann --- , South Africa PD Cowley --- , South AfricaThis study assessed the role of the Pondoland Marine Protected Area (MPA) in the Eastern Cape province of South Africa by evaluating retention versus ‘spillover’ of exploited fishery species that were tagged in a 400 km2 no-take zone of the... -
Shallow-water, nearshore current dynamics in Algoa Bay, South Africa, with notes on the implications for larval fish dispersal
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P Pattrick --- Department of Ichthyology and Fisheries Science, South Africa NA Strydom --- , South Africa WS Goschen --- , South AfricaNearshore currents play a vital role in the transport of eggs and larval stages of fish. However, little is known about their complexity and the implications for dispersal of fish larvae. The study describes the complexity of the shallow nearshore... -
Abyssal scavenging demersal fauna at two areas of contrasting productivity on the Subantarctic Crozet Plateau, southern Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NJ Cousins --- Oceanlab, UK T Horton --- National Oceanography Centre, Southampton, UK BD Wigham --- Dove Marine Laboratory, School of Marine Science and Technology, UK PM Bagley --- Oceanlab, UKThe Crozet Plateau is situated below typical high-nutrient, low-chlorophyll (HNLC) waters of the southern Indian Ocean. The area to the east of the Crozet Islands experiences high levels of surface productivity during the austral summer due to natural iron enrichment... -
The effects of barotrauma on five species of South African line-caught fish
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SE Kerwath --- Fisheries Research, Department of Agriculture, South Africa CG Wilke --- Fisheries Research, Department of Agriculture, South Africa A Götz --- Elwandle Node, South African Environmental Observation Network (SAEON), South AfricaManagement measures for South African line-caught fish include output controls such as closed seasons, bag and size limits and no-take moratoria. The main condition for these measures to be effective is that undesirable catches can be successfully released. However, most... -
Reviewing evidence of marine ecosystem change off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C L Moloney --- Department of Biological Sciences, South Africa S T Fennessy --- Oceanographic Research Institute, South Africa M J Gibbons --- Department of Biodiversity and Conservation Biology, South Africa A Roychoudhury --- Department of Earth Sciences, South Africa F A Shillington --- Marine Research Institute, South Africa B P von der Heyden --- Department of Earth Sciences, South Africa K Watermeyer --- Department of Biological Sciences, South AfricaRecent changes have been observed in South African marine ecosystems. The main pressures on these ecosystems are fishing, climate change, pollution, ocean acidification and mining. The best long-term datasets are for trends in fishing pressures but there are many gaps,... -
Changes in population structure of the white grouper Epinephelus aeneus as a result of long-term overexploitation in Senegalese waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: W Ndiaye --- Institut Fondamental d'Afrique Noire-Cheikh Anta Diop [IFAN-CH. A. Diop], Laboratoire de Biologie et d'Ecologie des Poissons en Afrique de l'Ouest [LABEP-AO], Senegal M Thiaw --- Centre de Recherches Océanographiques de Dakar-Thiaroye [CRODT], Senegal K Diouf --- Institut Fondamental d'Afrique Noire-Cheikh Anta Diop [IFAN-CH. A. Diop], Laboratoire de Biologie et d'Ecologie des Poissons en Afrique de l'Ouest [LABEP-AO], Senegal P Ndiaye --- Institut Fondamental d'Afrique Noire-Cheikh Anta Diop [IFAN-CH. A. Diop], Laboratoire de Biologie et d'Ecologie des Poissons en Afrique de l'Ouest [LABEP-AO], Senegal OT Thiaw --- Graduate Institute of Fisheries and Aquaculture [IUPA], Senegal J Panfili --- Institut de recherche pour le développement [IRD], UMR 5119 Ecologie des systèmes marins côtiers [ECOSYM], SenegalIn Senegal, a significant decrease in catches indicates that many demersal fish stocks are being overexploited. The white grouper Epinephelus aeneus, locally known as the ‘thiof’, is exploited by both small-scale and industrial fisheries. A 28-year database of E. aeneus... -
A decade of illegal fishing in Table Mountain National Park (2000–2009): trends in the illicit harvest of abalone Haliotis midae and West Coast rock lobster Jasus lalandii
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GC Brill --- Department of Geography and Environmental Science, South Africa SJPN Raemaekers --- Environmental Evaluation Unit, Department of Environmental and Geographical Sciences, South AfricaIllegal fishing activities are reported to be on the increase in South Africa, including in its marine protected areas (MPAs). Research is presented on the nature and the scale of illegal fishing in Table Mountain National Park (TMNP) by analysing... -
Physical damage, behaviour and post-release mortality of Argyrosomus japonicus after barotrauma and treatment
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PA Butcher --- New South Wales Department of Primary Industries, Australia MK Broadhurst --- New South Wales Department of Primary Industries, Australia BR Cullis --- School of Mathematics and Applied Statistics, Faculty of Informatics, Australia SR Raidal --- School of Animal and Veterinary Sciences, AustraliaTwo experiments were conducted to quantify the mortality of, and clinical signs of barotrauma to, Argyrosomus japonicus after retrieval from 20 m following either ‘no treatment’, ‘venting’ (a needle inserted into the swim bladder) or ‘recompression’ (released with a weighted... -
Reduced seabird night strikes and mortality in the Tristan rock lobster fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JP Glass --- Tristan Fisheries Department, Central South Atlantic Ocean PG Ryan --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, South AfricaThe main impact of the fishery for Tristan rock lobster Jasus tristani on seabirds at the Tristan archipelago and Gough Island is through night strikes, when petrels collide with a ship after being disorientated by its lights. Tristan fishery observers... -
Optimal BRUVs (baited remote underwater video system) survey design for reef fish monitoring in the Stilbaai Marine Protected Area
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L De Vos --- Percy FitzPatrick Institute of African Ornithology, South Africa A Götz --- Elwandle Node, South Africa H Winker --- Marine Research Institute, Department of Biological Sciences, South Africa CG Attwood --- Marine Research Institute, Department of Biological Sciences, South AfricaMarine protected areas (MPAs) play an important role in coastal conservation, but there is presently no uniformly applied methodology for monitoring the efficacy of coastal fish protection. Whereas underwater visual census and controlled angling surveys have been used, their skilled-labour... -
Lessons learnt from experimental temporary octopus fishing closures in south-west Madagascar: benefits of concurrent closures
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Benbow --- Blue Ventures Conservation, Level 2 Annex, UK F Humber --- Blue Ventures Conservation, Level 2 Annex, UK TA Oliver --- Blue Ventures Conservation, Level 2 Annex, UK KLL Oleson --- Blue Ventures Conservation, Level 2 Annex, UK D Raberinary --- Blue Ventures Conservation, Level 2 Annex, UK M Nadon --- Blue Ventures Conservation, Level 2 Annex, UK H Ratsimbazafy --- Blue Ventures Conservation, Level 2 Annex, UK A Harris --- Blue Ventures Conservation, Level 2 Annex, UKThis paper presents evidence of the fisheries effect of experimental temporary fishing closures for Octopus cyanea in the then-emergent Velondriake Locally Managed Marine Area (LMMA) in south-west Madagascar during 2004–2006. We present an analysis of the O. cyanea catch data... -
Diet and prey selection in late-stage larvae of five species of fish in a temperate estuarine nursery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NA Strydom --- Department of Zoology, South Africa K Sutherland --- Department of Zoology, South Africa TH Wooldridge --- Department of Zoology, South AfricaThe plankton assemblage of the permanently open Sundays Estuary in South Africa was sampled seasonally to provide further information on the feeding ecology of the larval stages of fishes in temperate estuaries. Collections were made between winter 2007 and autumn... -
A bootstrap method for estimating bias and variance in statistical fisheries modelling frameworks using highly disparate datasets
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BÞ Elvarsson --- Science Institute, Iceland L Taylor --- Science Institute, Iceland VM Trenkel --- Ifremer [French Research Institute for the Exploitation of the Sea], France V Kupca --- HPC2N [High Performance Computing Center North], Umeå University, Sweden G Stefansson --- Science Institute, IcelandStatistical models of marine ecosystems use a variety of data sources to estimate parameters using composite or weighted likelihood functions with associated weighting issues and questions on how to obtain variance estimates. Regardless of the method used to obtain point... -
Human impact on lake ecosystems: the case of Lake Naivasha, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GeorgeE Otiang'a-Owiti Ignatius Abiya OsweLake Naivasha is a wetland of national and international importance. However, it is under constant anthropogenic pressures, which include the quest for socioeconomic development within the lake ecosystem itself as well as other activities within the catchment. The lake is... -
Conservation biology and management of a critically endangered cyprinid, the Twee River redfin, Barbus erubescens (Teleostei: Cyprinidae), of the Cape Floristic Region, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: ND Impson MS Marriott IR Bills PH SkeltonThe Twee River redfin Barbus erubescens is a critically endangered small cyprinid endemic to the Twee River System, a subcatchment of the Olifants-Doring River System of South Africa. It is currently the most threatened freshwater fish in both the Cape... -
Movements of, and habitat utilisation by, threespot tilapia Oreochromis andersonii (Teleostei: Cichlidae) in the Upper Zambezi River, Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Finn Økland ClintonJ Hay TorF Næsje Ben Chanda EvaB ThorstadMovements of and habitat utilisation by radio-tagged threespot tilapia (body length 25–50cm) were studied in the Upper Zambezi River between 23 November 2000 and 8 May 2001. Although utilising a relatively large stretch of river (average 5.4km) during the study... -
Amplified Fragment Length Polymorphism markers reveal population structuring in Dimidiochromis kiwinge (Teleostei: Cichlidae), a commercially-exploited species from Lake Malawi
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Daud Kassam Shingo Seki Kosaku YamaokaThe understanding of between- and within-population genetic variation and its partitioning on the basis of geographic origin is crucial in designing efficient fishing and conservation strategies of populations and/or species. However, for Lake Malawi's cichlid species, such population genetic studies... -
Major constraints affecting aquaculture development in Akwa Ibom State, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: IniobongA Akpabio EmemB InyangThe study contributes to nationwide attempts to enhance the contributions of aquaculture to the fishery subsector, and consequent overall gross domestic product of Nigeria, as well as to the protein intake of her citizenry. The focus is on the determination... -
Technical efficiency of small-scale fishing households in Tanzanian coastal villages: an empirical analysis
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JenniferK Sesabo RichardSJ TolThe effort to conserve fisheries resources and improve the welfare of small-scale fishing households is an important objective of poverty reduction strategies in Tanzania. The success of such strategies depends on both the diversity and the level of efficiency within... -
Groundwater seeps as potentially important refugia for freshwater fishes on the Eastern Shores of Lake St Lucia, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SvenM Vrdoljak RobC HartThe freshwater wetlands on the Eastern Shores of Lake St Lucia provide an important habitat for freshwater fishes, including a number of IUCN Red Listed species. The ecology of these wetlands is influenced greatly by water flowing from the large... -
Lead levels in rivers, sediments and fish ponds in the Ibadan metropolitan area, south-west Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OlanikeK AdeyemoLead levels in rivers, their surface sediments, and in fish ponds in Ibadan, Nigeria, were assessed in the 2003–2004 dry and wet seasons. It was planned to reduce lead levels in petrol, regarded as the major source of lead in... -
The relationship between temperature and standard rate of metabolism in African lungfish, Protopterus aethiopicus, from Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AshleyW Seifert LaurenJ ChapmanThe relationship between temperature and metabolism among ancient (non-teleost) fishes, while largely unknown, is essential to an understanding of the effects of temperature on fish energetics. This study quantifies the effect of temperature on the standard rate of metabolism in... -
Settlement pattern and survival of a shell-infesting sabellid polychaete, Terebrasabella heterouncinata, on South African abalone, Haliotis midae, fed two diets
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MichaelS Gray Horst KaiserThis study tested whether abalone diet influences larval settlement success of the shell-dwelling sabellid polychaete Terebrasabella heterouncinata and their survival over the first 96h after settlement on host abalone. Shell area preferences of the sabellid were also investigated. Abalone diet... -
Influence of environmental factors on seasonal changes in clupeid catches in the Kigoma area of Lake Tanganyika
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: IA Kimirei YD MgayaAn investigation into the relationship between the fluctuating physico-chemical environment and variability in fish catches in the Kigoma, Tanzania, area of Lake Tanganyika was conducted from January to December 2003. Catch per unit effort (kg fishing unit–1 night–1) showed two... -
A preliminary investigation of winter daily food intake by four small teleost fish species from the Igoda Estuary, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LukhanyisoU Vumazonke TebelloS Mainoane Tembela Bushula EvgenyA PakhomovThe winter diet and daily ration of four small size classes of estuary-associated fishes, Rhabdosargus holubi, Gilchristella aestuaria, Glossogobius callidus and Monodactylus falciformis, from the temporarily open/closed Igoda Estuary were investigated. The diet of G. callidus was dominated by gammarid... -
Maturity, age and growth of Oreochromis karongae (Teleostei: Cichlidae) in Lakes Malawi and Malombe, Malawi
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Fanuel Kapute Emmanuel Kaunda Moses Banda Sinshuke MoriokaSize-at-50% maturity, age and growth, of Oreochromis (Nyasalapia) karongae ('chambo') in Lakes Malawi and Malombe were studied. Oreochromis karongae, a major component of the chambo species flock, attained 50% maturity at 225 mm TL in Lake Malawi and at 203... -
A preliminary assessment of the health status of feral populations of Chrysichthys nigrodigitatus in Lagos lagoon complex, Nigeria, using a modified Health Assessment Index protocol
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OluwatosinM Olarinmoye EdwinO Clarke ChristopherA Kumolu-Johnson OluwatoyinJ AderinolaA 'snapshot' evaluation of the health status of feral populations of the brackish water catfish, Chrysichthys nigrodigitatus, was carried out in 2006 at four locations in the Lagos lagoon complex, with varying levels of anthropogenic impacts, using a modified Health... -
The fishery for, and local distribution of, Aristeus antennatus (Risso 1816) (Crustacea: Dendrobranchiata) off western Algeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Mouffok A Kherraz D Bouras Z BoutibaThis study presents data on the local distribution and yield of red shrimp Aristeus antennatus (Risso 1816) from a new deep-water fishery on the western Algerian slope obtained from commercial trawl fisheries at Oran and Arzew ports between 1999 and... -
Effect of salinity on growth of juvenile silver kob, Argyrosomus inodorus (Teleostei: Sciaenidae)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HL Ferreira NG Vine CL Griffiths H KaiserAs part of the evaluation of new aquaculture species, the effect of environmental factors on growth, food conversion ratio and survival should be tested. In this study silver kob, Argyrosomus inodorus, were reared for 98 days at three salinities, of... -
Fish community response to increased river flow in the Kariega Estuary, a freshwater-deprived, permanently open southern African system
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PD Vorwerk PW Froneman AW Paterson AK WhitfieldThe littoral and demersal ichthyofaunal community structure in the freshwater-deprived, permanently open Kariega Estuary was investigated following heavy rain in November 2006 and was compared to low-flow condition data from 1991 and 1996. All surveys took place during the spring... -
Yersinia ruckeri infection in cultured Nile tilapia, Oreochromis niloticus, at a semi-intensive fish farm in lower Egypt
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AE Eissa M Moustafa M Abdelaziz NA EzzeldeenA Yersinia ruckeri infection was recorded in 2007 among a group of Nile tilapia, Oreochromis niloticus, from an earthen pond at a semi-intensive fish farm in Sharkiya Province, lower Egypt. The outbreak took place during the late winter-spring transition period,... -
Influence of largemouth bass, Micropterus salmoides, on abundance and habitat selection of Cape galaxias, Galaxias zebratus, in a mountain stream in the Cape Floristic Region, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JM Shelton JA Day CL GriffithsPredatory alien fishes have been widely introduced into streams in the Cape Floristic Region (CFR), South Africa, but little is known about their effect on native fishes. Results from this 2006 study suggest that the presence of alien predatory largemouth... -
Nature and pattern of lagoon fisheries resource utilisation and their implications for waterbird management in coastal Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: F Gbogbo W Oduro SK OppongSeasonal patterns in human fisheries resource utilisation and the capture characteristics of fish, swimming crabs and land crabs harvested from four coastal lagoons in Ghana between September 2005 and August 2007 are described. These are discussed in relation to sustainable... -
Haematological characteristics of African bony tongue, Heterotis niloticus (Teleostei: Arapaimidae), in south-western Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EO Ayotunde OA Fagbenro BO OffemHaematological characteristics — including red and white blood cells counts, haemoglobin, haematocrit, mean cell haemoglobin concentration, mean cell volume, mean cell haemoglobin, protein, glucose, albumin, sodium, chloride, potassium, magnesium and phosphorus — were established from an examination of 25 adult... -
Alterations in serum protein fractions and Na+-K+ATPase activity in Clarias gariepinus infested with henneguyosis in Ismailia, Egypt
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DM Sabri MA Danasoury IAM Eissa HM KhouraibaTotal serum protein, protein fractions and Na+-K+ATPase activity were estimated in Clarias gariepinus collected from surface waters in Ismailia governorate, Egypt. Comparisons were made between fish infested with respiratory henneguyosis and non-infested fish. Results of serum analysis revealed a significant... -
Population dynamics, life-history traits of and habitat use by two sympatric nothobranchiid fishes in a tropical stream, Kainji Lake Basin, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BD Olaosebikan SL Lamai T MusschootPopulation dynamics and life-history traits of two sympatric nothobranchiid killifishes, Epiplatys bifasciatus and E. spilargyreius, were studied for 24 months in an intermittent stream in the Kainji Lake Basin, Nigeria. Epiplatys bifasciatus was more abundant throughout the study period, but... -
Conserving the fishes of the Twee River, Western Cape, South Africa: revisiting the issues
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Marr LME Sutcliffe JA Day CL Griffiths PH SkeltonThe Twee River catchment contains two endemic fish species — the Twee River redfin and the Twee River galaxias — which are threatened by water abstraction, habitat degradation, and the presence of introduced fishes. Fyke nets were used to determine... -
Rapid biological assessment of the fishery potential of Xonxa Dam, near Queenstown, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TJ Richardson AJ Booth OLF WeylRapid biological assessments have been proposed as the most cost-effective approach to identify suitable target species and to set initial catch and fishing effort levels for new fisheries. Xonxa Dam, a turbid irrigation dam situated in the White Kei catchment,... -
The role of macroinvertebrates in the diets of the dominant fish species in Lake Nokoué, Benin
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: P Gnohossou --- Laboratoire d'Hydrobiologie et d'Aquaculture, P Laleye --- Laboratoire d'Hydrobiologie et d'Aquaculture, P Atachi --- Laboratoire d'Hydrobiologie et d'Aquaculture, J Moreau --- Laboratoire d’Agronomie, Environnement et Écotoxicologie, FranceBetween 2003 and 2006 the diets of 22 fish species, comprising approximately 90% of the Lake Nokoué fish biomass, were analysed. Macroinvertebrates dominated the diet of ten species, fishes were the preferential prey of six fish species, and detritus and... -
Gonad development in the freshwater oyster Etheria elliptica (Bivalvia: Etheriidae) in northern Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Ampofo-Yeboah --- Department of Renewable Natural Resources, M Owusu-Frimpong --- Department of Applied Biology, K Yankson --- School of Biological Sciences,Gonad development in the freshwater oyster Etheria elliptica from the White Volta River at Nawuni and the Oti River at Sabari (northern Ghana) was studied by histological examination from March to July 1999. Five developmental stages—developing, ripening, ripened, spawning and... -
Ecological integrity assessment of the fish assemblages of the Matigulu/Nyoni and Umvoti estuaries, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GC O'Brien --- Centre for Aquatic Research, Zoology Department, South Africa R Swemmer --- Centre for Aquatic Research, Zoology Department, South Africa V Wepener --- Centre for Aquatic Research, Zoology Department, South AfricaThe estuarine fish community index (EFCI) and an estuarine fish guild assessment (EFGA) were used in 2004 and 2008 to determine the ecological state and effects of selected ecosystem variables on the Umvoti and Matigulu/Nyoni estuaries. The EFCI indicated that... -
Application of a direct toxicity assessment approach to assess the hazard of potential pesticide exposure at selected sites on the Crocodile and Magalies rivers, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TM Ansara-Ross --- Centre for Aquatic Research, Department of Zoology, South Africa V Wepener --- Centre for Aquatic Research, Department of Zoology, South Africa PJ van den Brink --- Department of Aquatic Ecology and Water Quality Management, The Netherlands MJ Ross --- Centre for Aquatic Research, Department of Zoology, South AfricaThe potentially hazardous effects of agricultural pesticide usage in the Crocodile (west) Marico catchment were evaluated using the Danio rerio and Daphnia pulex lethality, Selenastrum capricornutum growth inhibition and the Ames mutagenicity plate incorporation assays. Hazard assessment categories are proposed... -
Age estimation, growth rate and size at sexual maturity of tigerfish Hydrocynus vittatus from the Okavango Delta, Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Gerber --- Centre for Aquatic Research, Department of Zoology, South Africa NJ Smit --- Centre for Aquatic Research, Department of Zoology, South Africa GM Pieterse --- Centre for Aquatic Research, Department of Zoology, South Africa D Durholtz --- , South AfricaThe aims of this study were to determine relative age, growth rate and size at maturity of tigerfish in the Okavango Delta as a basis for the development of a fisheries management plan. A total of 206 tigerfish Hydrocynus vittatus,... -
Blood lactate levels as a biomarker for angling-induced stress in tigerfish Hydrocynus vittatus from the Okavango Delta, Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NJ Smit --- Centre for Aquatic Research, Department of Zoology, South Africa G Howatson --- Centre for Aquatic Research, Department of Zoology, South Africa R Greenfield --- Centre for Aquatic Research, Department of Zoology, South AfricaAlthough critical in catch-and-release angling, no data are available on angling-induced stress in African gamefish. Blood lactate levels were used as a biomarker for angling-induced metabolic stress in tigerfish caught by angling in the Okavango Delta, Botswana. Blood was drawn... -
Role of pelagic crustaceans in the diet of the longnose lancetfish Alepisaurus ferox in the Seychelles waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Potier F Ménard Y Cherel A Lorrain R Sabatié F MarsacThe role of pelagic crustaceans in the diet of the longnose lancetfish Alepisaurus ferox was investigated from stomach content analysis of fish collected in the waters surrounding the Seychelles Archipelago in the western Indian Ocean. Crustaceans accounted for 88.4% by... -
First tracking of white stumpnose Rhabdosargus globiceps (Sparidae) in a South African marine protected area
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CG Attwood PD Cowley SE Kerwath TF Naesje F Økland EB ThorstadThere is a growing recreational fishery for white stumpnose Rhabdosargus globiceps (Sparidae) in Langebaan Lagoon, part of South Africa's West Coast National Park. The upper reaches of the lagoon are protected from fishing, but the extent to which the closure... -
Estimating the unreported catch of Eritrean Red Sea fisheries
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Tesfamichael TJ PitcherUnreported catches from three major fisheries in the Eritrean Red Sea were investigated in order to estimate the impact of the total extraction of fish from the ecosystem, which will help the assessment of the resource and its management. The... -
Area utilisation and activity patterns of roman Chrysoblephus laticeps (Sparidae) in a small marine protected area
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SE Kerwath A Götz CG Attwood WHH Sauer CG WilkeInformation on the movement of fish is vital to determine the effectiveness of marine protected areas (MPAs) for fish conservation and fisheries management. This study investigates area utilisation and activity patterns of 13 adult roman Chrysoblephus laticeps (Sparidae) using telemetry... -
Comparative morphology of the oropharyngeal cavity of clinid fish (Perciformes: Clinidae), with particular attention to the form, number and distribution of taste buds, and dentition
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: O Gon L Fishelson Y DelareaThe present study compares the form, number and distribution of taste buds (TB) in the oropharyngeal cavity (OC) of 17 species of clinid fish (Perciformes, Blennioidei, Clinidae) from different geographical regions (Australia, Taiwan, South Africa), and includes observations on dentition... -
A note on the diet and feeding of Chrysaora hysoscella in Walvis Bay Lagoon, Namibia, during September 2003
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BA Flynn MJ GibbonsThe diet of Chrysaora hysoscella was investigated from 55 specimens caught near the surface throughout 24h in Walvis Bay Lagoon, Namibia, during September 2003. The diet was diverse, ranging from dinoflagellates to carideans, and included abundant benthic species (adults and... -
Comparison of the effects of different linefishing methods on catch composition and capture mortality of South African temperate reef fish
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Götz SE Kerwath CG Attwood WHH SauerThe effects of hook size, bait type, water depth and fishing effort on the selectivity and capture mortality of reef fish were investigated in a standardised fishing experiment on the temperate south coast of South Africa. A total of 2... -
On the feasibility of a directed trap-fishery for panga Pterogymnus laniarius (Sparidae) in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MS Gray T Hecht WHH SauerThe feasibility of a directed trap-fishery for panga Pterogymnus laniarius was investigated with special emphasis on minimising the bycatch. A total of 1 302 fish, representing 19 species, was captured in 59 trap deployments at three locations along the Eastern... -
Development of fishery indicators for local management initiatives — a case study for Plettenberg Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MKS Smith CM King WHH Sauer PD CowleyIn attempts to achieve sustainability, ecosystem-based approaches to fisheries management are becoming increasingly applicable. Indicators to assess the success of management measures are an important component of this approach. Data from a recreational linefishery are used to develop and propose... -
Developing a policy and operational protocol for the formation of new commercial fisheries in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Oosthuizen WHH Sauer CJ AugustynThe development of new fisheries is one of the few options open to support the demands of South Africans for increased commercial access to their marine resources. Globally, the development of most new fisheries has been far from sustainable. Typically,... -
Assessment of recreational boat-angling in a large estuarine embayment in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BI Everett ST FennessyAn access point study was conducted from June 2002 to May 2003 to collect fishing effort, catch, catch composition and socio-economic information from the recreational estuarine boat-fishery in Richards Bay Harbour on the east coast of South Africa. An estimated... -
Sustainability and present-day approaches to fisheries management — are the two concepts irreconcilable?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GM Pilling AIL PayneSustainability may be defined as the maintenance of the quality, diversity and availability of fishery resources in sufficient quantities for present and future generations. But how do modern management systems aim to achieve this in the face of natural fluctuations... -
Assessment of the charter-boat fishery in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P Pradervand R van der ElstThe South African KwaZulu-Natal charter-boat fishery was assessed by means of a socio-economic questionnaire survey and catch inspections during the period August 2003–November 2004. In all, 38 charter operators were interviewed and 135 catch inspections undertaken. Of a total of... -
Estuarine use by spotted grunter Pomadasys commersonnii in a South African estuary, as determined by acoustic telemetry
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A-R Childs PD Cowley TF Næsje AJ Booth WM Potts EB Thorstad F ØklandFactors influencing estuarine use and marine excursions by spotted grunter Pomadasys commersonnii in the Great Fish Estuary, South Africa, were studied using manual and automated telemetry methods. In all, 20 individuals, ranging from 362 mm to 698 mm total length... -
Fine-scale spatial variability of different stages of pelagic fish eggs over the western Agulhas Bank, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MT Dopolo L Drapeau CD van der Lingen CL MoloneyStage-dependent spatial distributions of anchovy Engraulis encrasicolus, sardine Sardinops sagax and round herring Etrumeus whiteheadi eggs over the western Agulhas Bank South Africa were examined from samples collected at a fine-scale (1.8 km) resolution using a continuous underway fish egg... -
Few fish but many fishers: a case study of shore-based recreational angling in a major South African estuarine port
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LE Beckley ST Fennessy BI EverettRichards Bay is a subtropical estuary that has been extensively dredged to accommodate one of Africa's largest commercial ports. In the non-commercial areas of the harbour, shore-based angling is a popular recreational activity, but little is known about the anglers... -
Status of the estuarine-dependent riverbream Acanthopagrus berda (Sparidae) harvested by the multi-sectoral fishery in Kosi Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: N James NG Hall LE Beckley BQ Mann WD RobertsonA stock assessment was undertaken for the tropical sparid Acanthopagrus berda harvested in the Kosi Bay estuarine system, northern KwaZulu-Natal, South Africa, by a multi-sectoral fishery using traditional traps and gillnets, and recreational angling using rod-and-line. Input parameters used in... -
Comparing internal and external drivers in the southern Benguela and the southern and northern Humboldt upwelling ecosystems
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LJ Shannon S Neira M TaylorTrophic models of three upwelling ecosystems, the southern Benguela (South African), southern Humboldt (Chilean) and northern Humboldt (Peruvian) systems, have been fitted to catch, abundance and fishing mortality time-series. Three drivers were considered during the model fitting: internal forcing by... -
The effect of marine protected areas on an exploited population of sex-changing temperate reef fish: an individual-based model
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SE Kerwath A Götz CG Attwood WHH SauerThe effect of two marine protected areas (MPAs) on roman Chrysoblephus laticeps (Sparidae), an exploited reef-fish species inhabiting the South African temperate south coast, was simulated with a spatially explicit, individual-based model based on geographically correct habitat distribution. The model... -
Changes in the trophic structure of the southern Benguela before and after the onset of industrial fishing
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KE Watermeyer LJ Shannon CL GriffithsDespite a human presence in the Benguela region for at least one million years, exploitation of marine resources by European seafarers only began in earnest in the 1400s. Ecopath with Ecosim was used to construct and compare mass-balanced foodweb models... -
Changes in the trophic structure of the northern Benguela before and after the onset of industrial fishing
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KE Watermeyer LJ Shannon J-P Roux CL GriffithsExploitation of marine resources has been occurring in the northern Benguela ecosystem for centuries. Understanding the cumulative long-term effects of this exploitation is important toward effective management of the modern system. Retrospective mass-balanced models of the ecosystem have been constructed,... -
Estuarine habitat use by juvenile dusky kob Argyrosomus japonicus (Sciaenidae), with implications for management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PD Cowley SE Kerwath A-R Childs EB Thorstad F Økland TF NæsjeThe spatial and temporal area-use patterns of estuarine-dependent juvenile dusky kob Argyrosomus japonicus in the Great Fish Estuary, South Africa, were examined using acoustic telemetry. In all, 29 individuals (307–400 mm total length) were surgically equipped with individually coded transmitters... -
Assessment of the South African hake resource taking its two-species nature into account
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RA Rademeyer DS Butterworth ÉE PlagányiThe commercially valuable hake fishery off South Africa consists of two morphologically similar species, the shallow-water Cape hake Merluccius capensis and the deep-water Cape hake M. paradoxus. Because catch-and-effort statistics collected from the fishery are not species-disaggregated, previous published quantitative... -
The artisanal fishery for East Coast rock lobsters Panulirus homarus along the Wild Coast, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Steyn PJ Fielding MH SchleyerEast coast rock lobsters Panulirus homarus are collected by the indigenous people of the Wild Coast, in the Eastern Cape, South Africa, and are sold to coastal hotels and holidaymakers. The South African government has proposed a small-scale commercial fishery... -
Evidence of recovery of the linefishery in the Berg River Estuary, Western Cape, South Africa, subsequent to closure of commercial gillnetting
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Hutchings BM Clark LJ Atkinson CG AttwoodA total of 248 roving creel surveys along the length of the Berg River Estuary, in the Western Cape, South Africa, recorded 626 shore-angler and 88 boat-angler outings over the period December 2002–November 2005. Catch-and-effort information was obtained from catch... -
Selected fishery and population parameters of eight shore-angling species in the Tsitsikamma National Park no-take marine reserve
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Götz PD Cowley H WinkerAn eight-year research angling dataset collected between February 1998 and December 2005 in the Tsitsikamma National Park marine protected area (MPA), along the south-eastern Cape coast of South Africa, was examined to provide estimates of important fishery and population parameters... -
The 'fishery' in South Africa's remaining coastal stonewall fish traps
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LV Kemp GM Branch CA Attwood SJ LamberthAncient stonewall fish traps along the southern coast of South Africa, known locally as 'vywers', have both cultural and historical significance. Most have been degraded through neglect. Only two sets of vywers are actively maintained and fished, but without legal... -
Sightings of killer whales Orcinus orca from longline vessels in South African waters, and consideration of the regional conservation status
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AJ Williams SL Petersen M Goren BP WatkinsKiller whales Orcinus orca are seldom reported from South African nearshore waters but, allowing for the bias of vessel attraction, observations from longline vessels suggest there is a resident offshore population of fish-eating killer whales. We present reports of killer... -
Size distributions and sex ratios of sharks caught by Oman's artisanal fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AC Henderson --- Department of Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultanate of Oman JL McIlwain --- Department of Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultanate of Oman HS Al-Oufi --- Department of Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultanate of Oman S Al-Sheile --- Department of Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultanate of Oman N Al-Abri --- Department of Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultanate of OmanOman's fishery resources are exploited by artisanal and industrial fisheries, but the former accounts for almost 90% of landings. Within the artisanal fishery, sharks have traditionally been harvested for their flesh, but the development of a valuable export market for... -
Effects of fishing on a temperate reef community in South Africa 1: ichthyofauna
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Götz --- , South Africa SE Kerwath --- Department of Environmental Affairs, South Africa CG Attwood --- Marine Research Institute, Department of Zoology, South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, South AfricaExploitation of temperate reef fish not only affects the target species but potentially changes the composition of reef fish assemblages. This study investigated the effect of fishing on the ichthyofaunal community at protected and exploited sites around the Goukamma Marine... -
Effects of fishing on a temperate reef community in South Africa 2: benthic invertebrates and algae
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Götz --- , South Africa SE Kerwath --- Department of Environmental Affairs, South Africa CG Attwood --- Marine Research Institute, Department of Zoology, South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, South AfricaThe effect of fishing on benthic reef communities was studied by comparing reefs within and outside the Goukamma Marine Protected Area (MPA) on the South African warm-temperate south coast. Although study sites were similar in terms of bathymetry and oceanographic... -
Optimisation of underwater visual census and controlled angling methods for monitoring subtidal temperate reef fish communities
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RH Bennett --- Department of Ichthyology and Fisheries Science, South Africa A Götz --- , South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, South Africa PD Cowley --- , South Africa RM Palmer --- , South AfricaStandardised sampling protocols for monitoring fish stocks are essential to assess changes in stock status and provide a means to evaluate the effectiveness of fisheries management measures, such as marine protected areas (MPAs). This study aimed to optimise two standard... -
Comparative embryogenesis of Australian and South African viviparous clinid fishes (Blennioidei, Teleostei)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Fishelson --- Department of Zoology, George S Wise Faculty of Life Sciences, Israel O Gon --- , South AfricaThe study follows the embryogenesis of 16 species of viviparous clinid fishes (Clinidae, Teleostei), from the Cape south coast of South Africa and from Australia, with comparative remarks on the development of juveniles in oviparous species. The sperm intromitted into... -
Value and management of the subsistence fishery at Knysna Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: VR Napier --- Percy FitzPatrick Institute of African Ornithology, South Africa JK Turpie --- Percy FitzPatrick Institute of African Ornithology, South Africa BM Clark --- Department of Zoology, South AfricaKnysna Estuary supports an estimated 30 full-time and 200 part-time subsistence fishers involved in bait collection, mud crab harvesting, and fishing. The mud prawn Upogebia africana dominates the bait-fishery, with estimated catches amounting to about 3% of the standing stock,... -
Co-occurrence of tetrodotoxin and saxitoxin in Cambodian marine pufferfish Takifugu oblongus
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Ngy --- Graduate School of Science and Technology, Japan C-F Yu --- Department of Applied Biology and Chemical Technology, China S Taniyama --- Graduate School of Science and Technology, Japan T Takatani --- Faculty of Fisheries, Japan O Arakawa --- Faculty of Fisheries, JapanThe toxicity and toxin profiles of the marine pufferfish Takifugu oblongus were investigated from fish collected from Sihanouk Ville, one of the main regions where pufferfish poisonings (PFP) have occurred in Cambodia. Standard mouse bioassay revealed that all specimens collected... -
Joint Distributions for Movements of Elements in Sattolo's and the Fisher-Yates Algorithm
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Guy Louchard Helmut Prodinger Stephan WagnerSattolo's algorithm creates a random cyclic permutation by interchanging pairs of elements in an appropriate manner; the Fisher-Yates algorithm produces random (not necessarily cyclic) permutations in a very similar way. The distributions of the movements of the elements in these... -
Reproductive biology and distribution of Syngnathus temminckii and S. watermeyeri (Pisces: Syngnathidae) in southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Mwale --- South African Institute for Aquatic Biodiversity, South Africa H Kaiser --- Department of Ichthyology and Fisheries Science, South Africa PC Heemstra --- South African Institute for Aquatic Biodiversity, South AfricaThe reproductive biology and distribution of two species of Syngnathus (S. temminckii and S. watermeyeri) were investigated using information from museum specimens, published data, survey data and samples collected during mouth-breaching events of temporarily open/closed estuaries over the period 1950–2011... -
Processes influencing the population dynamics and conservation of African penguins on Dyer Island, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Ludynia --- Marine Research Institute, Department of Biological Sciences, South Africa LJ Waller --- Western Cape Nature Conservation Board, South Africa RB Sherley --- Marine Research Institute, Department of Biological Sciences, South Africa F Abadi --- Animal Demography Unit, Department of Biological Sciences, South Africa Y Galada --- Marine Research Institute, Department of Biological Sciences, South Africa D Geldenhuys --- Western Cape Nature Conservation Board, South Africa RJM Crawford --- Animal Demography Unit, Department of Biological Sciences, South Africa LJ Shannon --- Marine Research Institute, Department of Biological Sciences, South Africa A Jarre --- Marine Research Institute, Department of Biological Sciences, South AfricaDyer Island, South Africa, supported the largest African penguin Spheniscus demersus colony in 1979 (22 655 breeding pairs), but population dynamics of the species have not followed the trends of adjacent colonies in years of high fish abundance or shifts... -
Estimating present and future profits within the Namibian hake industry: a bio-economic analysis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CH Kirchner --- Graduate School of Business, South AfricaNamibia's fishing industry is managed using a system of fishing rights and individual fishing quotas. This property rights system was intended to encourage the local fishing industry to exploit the resource responsibly. Unfortunately, unintended perverse incentives have promoted induced overcapacity... -
Changes in the trophic structure, abundance and species diversity of exploited fish assemblages in the artisanal fisheries of the northern coast, Senegal, West Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: I Ndour --- Institut Sénégalais de Recherches Agricoles [ISRA]/Centre de Recherche Océanographique de Dakar-Thiaroye [CRODT], Sénégal F Le Loc'h --- Institut de Recherche pour le Développement [IRD], Laboratoire des sciences de l'Environnement Marin [UMR 6539 LEMAR] (Centre national de la recherche scientifique [CNRS], France J Kantoussan --- Université Gaston Berger [UGB], Sénégal M Thiaw --- Institut Sénégalais de Recherches Agricoles [ISRA]/Centre de Recherche Océanographique de Dakar-Thiaroye [CRODT], Sénégal HD Diadhiou --- Institut Sénégalais de Recherches Agricoles [ISRA]/Centre de Recherche Océanographique de Dakar-Thiaroye [CRODT], Sénégal JM Ecoutin --- Institut de Recherche pour le Développement [IRD], Sénégal L Tito de Morais --- Institut de Recherche pour le Développement [IRD], Laboratoire des sciences de l'Environnement Marin [UMR 6539 LEMAR] (Centre national de la recherche scientifique [CNRS], France OT Thiaw --- L'Institut Universitaire de Pêche et d'Aquaculture [IUPA], SénégalThis work investigates the effects of changes in both fishing pressure and the environment on the trophic dynamics, abundance and diversity of species in the artisanal commercial fisheries off the northern coast of Senegal. Using artisanal commercial fishing data (provided... -
Prioritising species for research, conservation and management: a case study of exploited fish species
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SJ Lamberth --- Branch: Fisheries Management, Department of Agriculture, South Africa AR Joubert --- Southern Waters Ecological Research and Consulting, South AfricaStudies that categorise species according to their conservation status often fall short in their implementation by not having taken into account the impacts on, or the response from, those that either benefit from, or exploit, the resource under consideration. This... -
Genetic diversity and gene flow in Clarias gariepinus from Lakes Victoria and Kanyaboli, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JE Barasa --- Department of Fisheries and Aquatic Sciences, Kenya R Abila --- Department of Fisheries Management and Aquaculture Technology, Kenya JP Grobler --- Department of Genetics, South Africa OG Dangasuk --- Department of Biological Sciences, Molecular Genetics Section, Kenya MN Njahira --- Biosciences eastern and central Africa - International Livestock Research Institute Hub (BecA-ILRI Hub), Kenya B Kaunda-Arara --- Department of Fisheries and Aquatic Sciences, KenyaThe African catfish Clarias gariepinus is an important species in the rapidly expanding aquaculture industry in East Africa. Most Kenyan catfish farmers use stocks with unknown genetic characteristics, with uncertified seeds and inter-basin exchange of brood stocks threatening the genetic... -
Metal bioaccumulation in the fish of the Olifants River, Limpopo province, South Africa, and the associated human health risk: a case study of rednose labeo Labeo rosae from two impoundments
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Jooste --- Department of Biodiversity, South Africa SM Marr --- Department of Biodiversity, South Africa A Addo-Bediako --- Department of Biodiversity, South Africa WJ Luus-Powell --- Department of Biodiversity, South AfricaThe Olifants River, Limpopo River system, is now one of the most polluted rivers in South Africa. The concentrations of metals in fish muscle tissue from two impoundments on the Olifants River, Flag Boshielo Dam and Phalaborwa Barrage, were measured... -
Response of endemic Clarias species’ life-history biometrics to land use around the papyrus-dominated Mpologoma riverine wetland, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GA Ssanyu --- Department of Biological Sciences, Uganda J Kipkemboi --- Department of Biological Sciences, Kenya JM Mathooko --- Global Research Akademik and Mentoring Services (GRAMS), Kenya J Balirwa --- Department of Fish Biology, UgandaThe Mpologoma River wetland is highly negatively impacted by rice growing and yet it provides habitat to endemic Clarias species that are important to the wetland fishery. Variations in life-history biometrics of small Clarias species at various wetland sites in... -
Diurnal and water salinity-dependent metabolic activity of juvenile white steenbras Lithognathus lithognathus
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: K Kandjou --- Department of Ichthyology and Fisheries Science, South Africa H Kaiser --- Department of Ichthyology and Fisheries Science, South AfricaThe euryhaline white steenbras Lithognathus lithognathus is an important estuarine-dependent fish species in the South African marine and estuarine environment. Its tolerance to water quality fluctuations, in particular its metabolic rate responses to salinity changes, has not been studied. In... -
Effect of Moringa oleifera on the histology, haematology and growth of Oreochromis mossambicus in aquadams® fertilised with chicken manure in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MM Rapatsa --- Aquaculture Research Unit, School of Agricultural and Environmental Sciences, South Africa NAG Moyo --- Aquaculture Research Unit, School of Agricultural and Environmental Sciences, South AfricaThe effect of Moringa oleifera seed powder on water quality and the histology, haematology and growth of Oreochromis mossambicus was investigated. Five dosage levels, 0, 100, 200, 300 and 400 mg l–1, of M. oleifera seed powder were applied to... -
Winners and losers – responses to recent environmental change by South African seabirds that compete with purse-seine fisheries for food
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Robert JM Crawford --- Branch Oceans and Coasts, South Africa Azwianewi B Makhado --- Branch Oceans and Coasts, South Africa Lauren J Waller --- CapeNature, South Africa Philip A Whittington --- Department of Zoology, South AfricaThere were recent changes in the distributions of the main prey of four seabirds off South Africa, with sardine Sardinops sagax and anchovy Engraulis encrasicolus shifting from South Africa's north-west coast towards the south-east. This contributed to numbers of African... -
Confronting stereotypes in the fishing industry in post-apartheid South Africa: A case study of women on the West Coast in the Western Cape, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Sharon Groenmeyer --- Centre for the Study of Democracy, South AfricaDrawing on research conducted in fish processing and allied industries, the women in this study engage in shoreline activities collecting mussels, red bait, shellfish, seaweed; catching crayfish and fish or cleaning fish and mending nets. Women's role in fishing is... -
Microcystin-LR equivalent concentrations in fish tissue during a postbloom Microcystis exposure in Loskop Dam, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Nchabeleng --- Department of Biodiversity, South Africa P Cheng --- CSIR Natural Resources and the Environment, South Africa PJ Oberholster --- CSIR Natural Resources and the Environment, South Africa A-M Botha --- Department of Genetics, South Africa WJ Smit --- Department of Biodiversity, South Africa WJ Luus-Powell --- Department of Biodiversity, South AfricaThe effects of a decomposing cyanobacteria bloom on water quality and the accumulation of microcystin-LR equivalent toxin in fish at Loskop Dam were studied in May 2012. Enzyme-linked immunosorbent assay [ELISA] was used to confirm the presence of microcystin-LR equivalent... -
Efficiency of using green algae as biological controllers against toxic algal taxa in cultured Nile tilapia Oreochromis niloticus, based on histopathological examinations
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Aly --- Department of Pathology, Faculty of Veterinary Medicine, Egypt EM Ali --- Department of Environmental Sciences, Faculty of Sciences, Egypt AA Dessouki --- Department of Pathology, Faculty of Veterinary Medicine, Egypt AA Dawah --- Department of Limnology, EgyptThe incidence of harmful cyanobacterial blooms in surface waters has increased in frequency and outbreaks have become more severe. This research aimed at studying the effect of a culture of two green algal species as biological control of the growth... -
Analysis of active rotenone concentration during treatment of the Rondegat River, Cape Floristic Region, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: E Slabbert --- Department of Microbiology, South Africa MS Jordaan --- CapeNature Scientific Services, South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaMost endemic freshwater fish species of the Cape Floristic Region are listed as threatened, due mainly to the impacts of invasive alien fish species. The piscicide rotenone has been identified as a potential tool to aid the conservation of indigenous... -
Assessing the suitability of commercial fisheries data for local-scale marine spatial planning in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Chalmers --- Department of Ichthyology and Fisheries Science, South Africa A Oosthuizen --- Park Planning and Development, South African National Parks, South Africa A Götz --- Department of Ichthyology and Fisheries Science, South Africa A Paterson --- South African Institute for Aquatic Biodiversity, South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, South AfricaThis study integrates fisheries logbook data with observer and vessel monitoring system (VMS) data in order to assess the accuracy of reported data and to develop high-resolution spatial data suitable for use in local-scale marine spatial planning analyses. Spatial assessments... -
Predation by introduced largemouth bass Micropterus salmoides on indigenous marine fish in the lower Kowie River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: ML Magoro --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa AK Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa L Carassou --- Department of Zoology and Entomology, South AfricaThe predatory impact of introduced largemouth bass Micropterus salmoides on the juveniles of estuary-associated indigenous marine fish species in the lower Kowie River and estuary headwaters was investigated in 2012–2013. Stomach contents and stable isotope analyses were employed to assess... -
Effect of rotenone on gill-respiring and plastron-respiring insects
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AJ Booth --- Department of Ichthyology and Fisheries Science, South Africa S Moss --- Department of Ichthyology and Fisheries Science, South Africa OLF Weyl --- Department of Ichthyology and Fisheries Science, South AfricaRotenone, a commonly-used piscicide, interferes with the cellular respiration of aquatic vertebrates and invertebrates by preventing the uptake of oxygen. While dose-response relationships have been developed for fish, there are limited comparative data available on aquatic insects that respire either... -
Biochemical, haematological and morphological variations in juvenile Clarias gariepinus exposed to Carbendazim® fungicide
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CD Nwani --- Department of Zoology and Environmental Biology, Nigeria MC Omah --- Department of Applied Biology and Biotechnology, Nigeria N Ivoke --- Department of Zoology and Environmental Biology, Nigeria HO Nwamba --- Department of Applied Biology and Biotechnology, Nigeria C Ani --- Department of Applied Biology, Nigeria SU Ogbonna --- Department of Applied Biology, NigeriaThe biochemical, haematological and morphological variations in juvenile Clarias gariepinus exposed to Carbendazim® (methyl-2-benzimidazole carbamate; CBZ), a fungicide effective for the control of fungal pathogens in plants, were determined. The 96 h LC50 value of CBZ determined by probit analysis... -
Biochemical and haematological responses in African catfish Clarias gariepinus following chronic exposure to NPK (15:15:15) fertiliser
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MNO Ajima --- Department of Fisheries and Aquaculture Technology, Nigeria OA Ogo --- Department of Biochemistry, Nigeria LE Akpa --- Department of Zoology, Nigeria I Ajaero --- Department of Fisheries and Aquaculture Technology, NigeriaThe indiscriminate use of inorganic fertilisers to boost plant productivity has resulted in negative consequences in aquatic ecosystems. The effects of chronic exposure to NPK (15:15:15) fertiliser at 0.40, 0.80 and 1.60 g l−1 on the haematological and biochemical responses... -
The nursery role of a sheltered surf-zone in warm-temperate southern Africa
Item type: Journal Article • Journal: African Zoology • Authors: Gavin M Rishworth --- Department of Zoology, Nelson Mandela Metropolitan University, South Africa Nadine A Strydom --- Department of Zoology, Nelson Mandela Metropolitan University, South Africa Warren M Potts --- Department of Ichthyology and Fisheries Science, Rhodes University, South AfricaMarine fish nurseries such as surf-zones have usually been classified as nurseries based solely on the density of pre-adult fish, yet the full suite of developmental stages are seldom assessed because of difficulties associated with sampling these habitats. The larval... -
First record of the Southeast Asian walking catfish, Clarias batrachus (Pisces: Clariidae), from the island of Mauritius, south-western Indian Ocean
Item type: Journal Article • Journal: African Zoology • Authors: Irfan Nunkoo --- Marine Research Institute, Department of Biological Sciences, University of Cape Town, South Africa Cecile Reed --- Marine Research Institute, Department of Biological Sciences, University of Cape Town, South Africa Sven Kerwath --- Marine Research Institute, Department of Biological Sciences, University of Cape Town, South AfricaThe presence of Southeast Asian walking catfish, Clarias batrachus, in Mauritian freshwater systems has been confirmed. Three female Clarias batrachus were caught in Rivière Sèche, close to the town of Phoenix, Mauritius (20°17′ S, 57°33′ E). This constitutes the first... -
A morphological description of the sagittal otoliths of two mormyrids, Marcusenius macrolepidotus and Petrocephalus catostoma (Family: Mormyridae)
Item type: Journal Article • Journal: African Zoology • Authors: N.N. Nicolaai --- Department of Zoology and Biology, South Africa A. Jooste --- Department of Zoology and Biology, South AfricaThe morphology of the sagittal otoliths of two South African mormyrid fish, Marcusenius macrolepidotus and Petrocephalus catostoma, were studied to determine possible morphological significance. The sagittae of M. macrolepidotus and P. catostoma are kidney-shaped and oblong, respectively. The ventral margin... -
Studies on aspects of the biology of Tilapia mariae (Boulenger, 1899) (Osteichthyes Cichlidae) in Ethiope River, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Zoology • Authors: Robert B. Ikomi --- Department of Zoology, Nigeria Happy O. Jessa --- Department of Zoology, NigeriaAspect of the biology of Tilapia mariae Boulenger, 1899, in Ethiope River were examined. T. mariae was captured in the river throughout the year and constituted about 31% of the cichlid catch. It attained a standard length of 17.5 cm;... -
Movements and habitat utilization of nembwe, Serranochromis robustus (Günther, 1864), in the Upper Zambezi River
Item type: Journal Article • Journal: African Zoology • Authors: Eva B. Thorstad --- Norwegian Institute for Nature Research (NINA), Norway Clinton J. Hay --- Ministry of Fisheries and Marine Resources, Namibia Tor F. Næsje --- Norwegian Institute for Nature Research (NINA), Norway Ben Chanda --- Ministry of Agriculture and Co-operatives, Department of Research and Specialised Services, Zambia Finn Økland --- Norwegian Institute for Nature Research (NINA), NorwayFifteen adult nembwe Serranochromis robustus (Günther, 1864) were tagged with radio transmitters in the Zambezi River, Namibia, from 4–15 November 2000 to record behaviour and outline the implications for fisheries management. The fish were tracked on average every 3.7 days... -
Life history characteristics of Alticus monochrus, a supratidal blenny of the southern Indian Ocean
Item type: Journal Article • Journal: African Zoology • Authors: M. Bhikajee --- Faculty of Science, University of Mauritius, Mauritius J. M. Green --- Department of Biology, Canada R. Dunbrack --- Department of Biology, CanadaThe blenny Alticus monochrus Bleeker inhabits exposed rocky shores of Mauritius and other islands of the southwestern Indian Ocean. A. monochrus is an amphibious species and remains almost exclusively above the water line, migrating vertically with the tide while feeding... -
The influence of selected environmental parameters on the distribution of the dominant demersal fishes in the Kariega Estuary channel, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Naomi Richardson --- Department of Ichthyology and Fisheries Science, South Africa Alan K. Whitfield --- South African Institute for Aquatic Biodiversity, South Africa Angus W. Paterson --- South African Institute for Aquatic Biodiversity, South AfricaThe Kariega Estuary channel was sampled using an otter trawl and the demersal fish catch analysed using the PRIMER statistical package. A biological-environmental (BIOENV) analysis was undertaken using the catch per unit effort ichthyofaunal data from the spring/summer period of... -
An analysis of the recreational shore fishery in the Goukamma Marine Protected Area
Item type: Journal Article • Journal: African Zoology • Authors: P. Pradervand --- Oceanographic Research Institute, South Africa R. Hiseman --- Western Cape Nature Conservation Board, South AfricaTen years (1993–2002) of shore fishing catch and effort data collected during routine patrols in the Goukamma Marine Protected Area in theWestern Cape Province were analysed. Of a total of 35 species recorded, the most common were backtail, Diplodus sargus... -
First record of predation by the alien invasive freshwater fish Micropterus salmoides L. (Centrarchidae) on migrating estuarine fishes in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Olaf L. F. Weyl --- Department of Ichthyology and Fisheries Science, South Africa Hylton Lewis --- Department of Ichthyology and Fisheries Science, South AfricaThis study presents results from stomach content analysis of 123 largemouth bass, Micropterus salmoides, sampled at the mouth of the fishway leading into a 3 m high weir at the tidal limit of the Kowie River, Eastern Cape Province (33°32‘39“S,... -
Are wild African lungfish obligate air breathers? Some evidence from radio telemetry
Item type: Journal Article • Journal: African Zoology • Authors: C. M. Mlewa --- Department of Fisheries, Kenya J. M. Green --- Department of Biology, Canada A1B 3X9 R. Dunbrack --- Department of Biology, Canada A1B 3X9Laboratory studies have resulted in classification of the marbled African lungfish, Protopterus aethiopicus, as an obligate air-breather. However, there have been no investigations of the extent of dependence on aerial respiration by this species in the wild. We used radio... -
Long-term trends in the competitive shore fishery along the KwaZulu-Natal coast, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: P. Pradervand --- Oceanographic Research Institute, South Africa B. Q. Mann --- Oceanographic Research Institute, South Africa M. F. Bellis --- Records Officer, South African Shore Angling Association, South AfricaTwenty-four years (1977–2000) of competitive shore angling catch and effort data from the KwaZulu-Natal Coastal Anglers Union for the province of KwaZulu-Natal were analysed. Of a minimum of 117 species recorded, the most commonly caught species were dusky shark (Carcharhinus... -
Effects of temperature and salinity on resting metabolism in two South African rock pool fish: the resident gobiid Caffrogobius caffer and the transient sparid Diplodus sargus capensis
Item type: Journal Article • Journal: African Zoology • Authors: J. O. G. Kemp [AN0001]Intertidal rock pools are inherently dynamic environments that experience marked changes in physico-chemical parameters over diel, tidal and seasonal time scales. Fish that inhabit the intertidal zone can generally be characterized as either permanent residents or transients/visitors. This study investigates... -
First assessment of estuarine space use and home range of juvenile white steenbras, Lithognathus lithognathus
Item type: Journal Article • Journal: African Zoology • Authors: R. H. Bennett --- Department of Ichthyology and Fisheries Science, South Africa A. R. Childs --- Department of Ichthyology and Fisheries Science, South Africa P. D. Cowley --- South African Institute for Aquatic Biodiversity, South Africa T. F. Næsje --- Norwegian Institute for Nature Research, Norway E. B. Thorstad --- Norwegian Institute for Nature Research, Norway F. Økland --- Norwegian Institute for Nature Research, NorwayThe spatial dynamics and home range sizes of early juvenile white steenbras (Lithognathus lithognathus Cuvier, 1829) in the permanently open Great Fish Estuary, South Africa, were assessed using acoustic telemetry. Seven individuals (154–184 mm fork length) tagged with acoustic transmitters... -
A comparison of three techniques for fluorochrome marking of juvenile Clarias gariepinus otoliths
Item type: Journal Article • Journal: African Zoology • Authors: Reece Wartenberg --- Department of Ichthyology and Fisheries Science, South Africa Anthony J. Booth --- South African Institute for Aquatic Biodiversity, South Africa Olaf L. F. Weyl --- South African Institute for Aquatic Biodiversity, South AfricaIntramuscular injection of the antibiotic oxytetracycline (OTC) has been the only method previously employed for chemically marking C. gariepinus otoliths for ageing studies. This study compared intramuscular injection, immersion, and dietary incorporation methods of administering OTC to determine the most... -
Aspects of the ecology of Cichlidogyrus philander collected from Pseudocrenilabrus philander philander from the Padda Dam, Gauteng, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Louise E. le Roux --- Department of Zoology, South Africa A. Avenant-Oldewage --- Department of Zoology, South Africa F. C. van der Walt --- Department of Statistics, South AfricaCichlidogyrus philander was originally described from Pseudocrenilabrus philander philander in Lake Kariba, Zimbabwe. Specimens from four fish species were collected during this study over a 14-month period from the Padda Dam, Johannesburg, transported to the laboratory and killed. Following examination,... -
Conservation status and distribution of freshwater fishes in South African national parks
Item type: Journal Article • Journal: African Zoology • Authors: I. A. Russell --- South African National Parks, South AfricaThirteen of South Africa’s national parks contain aquatic systems which support 63 indigenous and 11 alien freshwater fishes. Indigenous fishes include 43 species of the Zambezian faunal group (70% of the national total), eight Karroid (47%), five Cape (31%) and... -
Invasive alien freshwater fishes in the Wilderness Lakes System, a wetland of international importance in the Western Cape Province, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: A. A. Olds --- Department of Ichthyology and Fisheries Science, South Africa M. K. S. Smith --- South African National Parks, Scientific Services, South Africa O. L. F. Weyl --- South African Institute for Aquatic Biodiversity, South Africa I. A. Russell --- South African National Parks, Scientific Services, South AfricaThe Wilderness Lakes System incorporates a RAMSAR listed wetland. Previous ichthyological surveys reported three invasive freshwater fishes; Oreochromis mossambicus (Mozambique tilapia), Gambusia affinis (mosquitofish) and Micropterus salmoides (largemouth bass) from this system. To assess the status of these alien fishes,... -
Marine connectivity and fish length frequencies of selected species in two adjacent temporarily open/closed estuaries in the Eastern Cape Province, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Poogendri Reddy --- South African Institute for Aquatic Biodiversity, South Africa Nicola C. James --- South African Institute for Aquatic Biodiversity, South Africa Alan K. Whitfield --- South African Institute for Aquatic Biodiversity, South Africa Paul D. Cowley --- South African Institute for Aquatic Biodiversity, South AfricaThe effects of timing, frequency and duration of mouth opening and marine overwash events on fish assemblages in two, adjacent temporarily open/closed estuaries were investigated. Sampling was conducted biannually over two years during summer and winter, using selective sampling gear... -
Monogenean parasite species descriptions from Labeo spp. hosts in the Vaal Dam, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Dionne Crafford --- Department of Zoology, South Africa Wilmien Luus-Powell --- School of Molecular and Life Sciences, Department of Biodiversity, South Africa Annemarié Avenant-Oldewage --- Department of Zoology, South AfricaSpecimens of Labeo capensis (n = 13) and Labeo umbratus (n = 26) from the Vaal Dam (South Africa) were collected and examined for gill and skin monogenean parasites. Three new Dactylogyrus and one new Dogielius species are described. Dactylogyrus... -
Residency and small-scale movement behaviour of three endemic sparid fishes in their shallow rocky subtidal nursery habitat, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Peter A. Watt-Pringle --- Department of Ichthyology and Fisheries Science, Rhodes University, South Africa Paul D. Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa Albrecht Götz --- Elwandle Node, South African Environmental Observation Network (SAEON), South AfricaThe residency and small-scale movements of early juveniles (<175 mm fork length) of three sparid fish species were examined in the shallow subtidal zone along a 500 m stretch of rocky coastline near Schoenmakerskop (Eastern Cape Province, South Africa). A... -
Determining the most suitable method of otolith preparation for estimating the age of tigerfish, Hydrocynus vittatus in the Pongolapoort Dam, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: M. Soekoe --- Department of Zoology, South Africa F. H. van der Bank --- Department of Zoology, South Africa N. J. Smit --- North-West University, PotchefstroomThis study compares sectioned and whole lapillus and asterisci otoliths as suitable structures for ageing tigerfish, Hydrocynus vittatus. Fifty tigerfish were collected from the Pongolapoort Dam, KwaZulu-Natal, South Africa. Growth zone counts on sectioned lapilli showed the greatest percentage agreement... -
First record of an introduction of the giant pangasius, Pangasius sanitwongsei Smith 1931, into an African river
Item type: Journal Article • Journal: African Zoology • Authors: Tuuli Mäkinen --- South African Institute for Aquatic Biodiversity, South Africa Olaf L. F. Weyl --- South African Institute for Aquatic Biodiversity, South Africa Kerry-Ann van der Walt --- South African Institute for Aquatic Biodiversity, South Africa Ernst R. Swartz --- South African Institute for Aquatic Biodiversity, South AfricaA catfish captured in the Breede River (33°56 41.6”S 20°4’45.6”E) in South Africa was identified using morphological and genetic techniques as the giant pangasius, Pangasius sanitwongsei Smith 1931, a new record for South Africa. The wild-caught specimen was a genetic... -
Fish utilization of surf-zones. Are they changing? A case study of the Sheltered, warm-temperate King’s Beach
Item type: Journal Article • Journal: African Zoology • Authors: Gavin M. Rishworth --- Department of Zoology, South Africa Nadine A. Strydom --- Department of Zoology, South Africa Warren Potts --- Department of Ichthyology and Fisheries Science, South AfricaSurf-zone fish communities and their shifts over time are generally poorly understood. The aim of this study was to compare the current surf-zone fish assemblage at King's Beach, South Africa, to a similar study conducted three decades ago, before the... -
Ecology of diplostomid (Trematoda: Digenea) infection in freshwater fish in southern Africa
Item type: Journal Article • Journal: African Zoology • Authors: Andri Grobbelaar --- Department Zoology and Entomology, South Africa Liesl L. Van As --- Department Zoology and Entomology, South Africa Hennie J.B. Butler --- Department Zoology and Entomology, South Africa Jo G. Van As --- Department Zoology and Entomology, South AfricaThe complex life cycles of most trematode parasites include three hosts. The first intermediate host is a snail, the second is normally a teleost fish and a piscivorous bird serves as the definitive host. Lymnaeid snails are most likely to... -
An exploratory investigation of the fish communities associated with reefs on the central Agulhas Bank, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Albrecht Götz --- Elwandle Node, South African Environmental Observation Network (SAEON), South Africa Sven E. Kerwath --- Fisheries Research, Department of Agriculture, South Africa Toufiek Samaai --- Department of Environmental Affairs, South Africa Charlene da Silva --- Fisheries Research, Department of Agriculture, South Africa Christopher G. Wilke --- Fisheries Research, Department of Agriculture, South AfricaDespite their ecological and economic importance, the temperate reef habitats of the central Agulhas Bank remain poorly studied. From 2008 to 2010, multiple stations grouped into six general sites of varying depth, profile and distance offshore, were surveyed. A combination... -
Preliminary evaluation of the impact of invasive smallmouth bass Micropterus dolomieu on native fish abundance in the Witte River, Cape Floristic Region, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Jeremy M. Shelton --- Department of Biological Sciences, South Africa Jenny A. Day --- Department of Biological Sciences, South Africa N. Dean Impson --- CapeNature Scientific Services, South AfricaThe impact of invasive smallmouth bass, Micropterus dolomieu, on the abundance of two native fish species, Breede River redfin, Pseudobarbus burchelli, and Cape kurper, Sandelia capensis, was investigated in the Witte River tributary of the Breede River in South Africa’s... -
Dynamics of recruitment of larval and juvenile Cape stumpnose Rhabdosargus holubi (Teleostei: Sparidae) into the Swartkops and Sundays estuaries, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: Y Kisten --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa P Pattrick --- Department of Zoology, South Africa NA Strydom --- Department of Zoology, South Africa R Perissinotto --- DST/NRF Research Chair in Shallow Water Ecosystems, South AfricaRecruitment of early life stages into estuaries is an integral part of the life cycle of many marine fish species. Although estuaries are naturally environmentally dynamic, they also are subject to anthropogenic disturbances, including land use and climate change, which... -
Ecosystem modelling in the southern Benguela: comparisons of Atlantis, Ecopath with Ecosim, and OSMOSE under fishing scenarios
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MD Smith --- Department of Zoology, Australia EA Fulton --- CSIRO [Commonwealth Scientific and Industrial Research Organisation], Australia RW Day --- Department of Zoology, Australia LJ Shannon --- Marine Research Institute and Department of Biological Sciences, South Africa Y-J Shin --- Marine Research Institute and Department of Biological Sciences, South AfricaEcosystem-based management of marine fisheries requires the use of simulation modelling to investigate the system-level impact of candidate fisheries management strategies. However, testing of fundamental assumptions such as system structure or process formulations is rarely done. In this study, we... -
Shoebill Balaeniceps rex foraging behaviour in the Bangweulu Wetlands, Zambia
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Ralf HE Mullers --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Arjun Amar --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South AfricaShoebills (Balaeniceps rex) are endemic to large, well-vegetated wetlands in central-eastern Africa. Populations are believed to be declining throughout their range and knowledge about their ecology, behaviour and distribution is vital for their effective conservation. In this study we quantified... -
Influence of mouth status on population structure of southern African endemic estuarine-spawning ichthyofauna in a temperate, temporarily open/closed estuary
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GP Tweddle --- Coastal Research Unit of Zululand, Department of Zoology, South Africa PW Froneman --- Department of Zoology and Entomology, South AfricaThe effect of mouth status on the population structure of three endemic estuarine-spawning fish species was assessed using seine nets from November 2005 to October 2007 in the temporarily open/closed Mpekweni Estuary, Eastern Cape, South Africa. Collectively, these three species... -
Marine fish parasitology in South Africa: history of discovery and future direction
Item type: Journal Article • Journal: African Zoology • Authors: Nico J Smit --- Water Research Group (Parasitology), Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, South Africa Kerry A Hadfield --- Water Research Group (Parasitology), Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, South AfricaAlmost 200 years have passed since the first description of a marine fish parasite from South Africa. It is therefore an opportune time to look back, take stock of and reflect on the history of discovery within this field and,... -
Review of Mothocya Costa, in Hope, 1851 (Crustacea: Isopoda: Cymothoidae) from southern Africa, with the description of a new species
Item type: Journal Article • Journal: African Zoology • Authors: Kerry A Hadfield --- Water Research Group (Ecology), Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, South Africa Niel L Bruce --- Water Research Group (Ecology), Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, South Africa Nico J Smit --- Water Research Group (Ecology), Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, South AfricaThree species of Mothocya are reported from the east coast of southern Africa: Mothocya plagulophora (Haller, 1880) from Maputo, Mozambique, from the gills of Hemiramphus far (Forsskål, 1775); Mothocya renardi (Bleeker, 1857) from diverse localities in South Africa and Mozambique,... -
Distribution of Contracaecum (Nematoda: Anisakidae) larvae in freshwater fish from the northern regions of South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Sareh Tavakol --- Department of Biodiversity, University of Limpopo, South Africa Willem J Smit --- Department of Biodiversity, University of Limpopo, South Africa Joseph R Sara --- Department of Biodiversity, University of Limpopo, South Africa Ali Halajian --- Department of Biodiversity, University of Limpopo, South Africa Wilmien J Luus-Powell --- Department of Biodiversity, University of Limpopo, South AfricaA total of 1 847 fishes (16 species) from 14 reservoirs in northern and north-eastern regions of South Africa were collected and examined for larval Contracaecum spp. between 2005 and 2013. This study, the first to examine several potential second... -
The current status and management of South Africa's chondrichthyan fisheries
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C da Silva --- Branch: Fisheries Management, Department of Agriculture, South Africa AJ Booth --- Department of Ichthyology and Fisheries Science, South Africa SFJ Dudley --- Branch: Fisheries Management, Department of Agriculture, South Africa SE Kerwath --- Branch: Fisheries Management, Department of Agriculture, South Africa SJ Lamberth --- Branch: Fisheries Management, Department of Agriculture, South Africa RW Leslie --- Branch: Fisheries Management, Department of Agriculture, South Africa ME McCord --- South African Shark Conservancy (SASC), South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, South Africa T Zweig --- South African Shark Conservancy (SASC), South AfricaChondrichthyans (sharks, skates, rays and chimaeras) are captured in many marine fisheries. Management and research efforts directed at chondrichthyan fishing are often neglected because of low product value, taxonomic uncertainty, low capture rates, and harvesting by multiple fisheries. In South... -
Pelagic shark fisheries of Indonesia's Eastern Indian Ocean Fisheries Management Region
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: Fahmi --- Research Centre for Oceanography, Indonesian Institute of Sciences, Indonesia Dharmadi --- Research Centre for Fisheries Management and Conservation, Ministry of Marine Affairs and Fisheries, IndonesiaSharks are commonly caught in Indonesian waters both by target fisheries and as bycatch. Fishers targeting sharks mostly employ drift longlines, whereas tuna longlines and gillnets are the gear mostly responsible for shark bycatch. Our studies on shark fisheries have... -
Fisheries management and conservation of sharks in Indonesia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: Dharmadi --- Research Centre for Fisheries Management and Conservation, Indonesia Fahmi --- Research Centre for Oceanography, Indonesia F Satria --- Research Centre for Fisheries Management and Conservation, IndonesiaIndonesian waters have a high diversity of sharks and rays, with at least 118 species belonging to 25 families found throughout the vast archipelago. Indonesia also has the highest shark landings globally and nearly all high‑value shark species are overexploited... -
Introduction, establishment and spread of the Southern mouthbrooder Pseudocrenilabrus philander in the Baakens River, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Cuen Muller --- Zoology Department, South Africa Olaf LF Weyl --- South African Institute for Aquatic Biodiversity, South Africa Nadine A Strydom --- Zoology Department, South AfricaThis paper provides evidence for the extralimital establishment and spread of Pseudocrenilabrus philander in the Baakens River, Eastern Cape, South Africa. Since the first occurrence record at a single locality in 1994 this species has now spread throughout the river... -
Movement patterns of Lichia amia (Teleostei: Carangidae): results from a long-term cooperative tagging project in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Stuart W Dunlop --- Oceanographic Research Institute, South Africa Bruce Q Mann --- Oceanographic Research Institute, South Africa Paul D Cowley --- South African Institute for Aquatic Biodiversity, South Africa Taryn S Murray --- South African Institute for Aquatic Biodiversity, South Africa Jade Q Maggs --- Oceanographic Research Institute, South AfricaUnderstanding fish movement patterns and migrations is important for fisheries management as well as the identification and conservation of critical habitats. Data collected by the Oceanographic Research Institute's Cooperative Fish Tagging Project (ORI-CFTP) were used to describe the large-scale movement... -
Molecular species identification and population genetics of chondrichthyans in South Africa: current challenges, priorities and progress
Item type: Journal Article • Journal: African Zoology • Authors: Aletta E Bester-van der Merwe --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa Katie S Gledhill --- South African Shark Conservancy, South AfricaMolecular genetic techniques, such as DNA barcoding and genotyping, are increasingly being used to assist with the conservation and management of chondrichthyans worldwide. Southern Africa is a shark biodiversity hotspot, with a large number of endemic species. According to the... -
A review of the assessments of the major fisheries resources in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CL de Moor --- Marine Resource Assessment and Management Group (MARAM), Department of Mathematics and Applied Mathematics, South Africa SJ Johnston --- Marine Resource Assessment and Management Group (MARAM), Department of Mathematics and Applied Mathematics, South Africa A Brandão --- Marine Resource Assessment and Management Group (MARAM), Department of Mathematics and Applied Mathematics, South Africa RA Rademeyer --- Marine Resource Assessment and Management Group (MARAM), Department of Mathematics and Applied Mathematics, South Africa JP Glazer --- Branch: Fisheries Management, Department of Agriculture, South Africa LB Furman --- Marine Resource Assessment and Management Group (MARAM), Department of Mathematics and Applied Mathematics, South Africa DS Butterworth --- Marine Resource Assessment and Management Group (MARAM), Department of Mathematics and Applied Mathematics, South AfricaThe waters off South Africa's coastline boast a rich mix of commercially fished species. Quantitative assessments of these marine resources have developed from simple methods first applied in the 1970s, to models that encompass a wide range of methodologies. The... -
The effects of stock size and environmental variability on Cape hake recruitment in Namibia: an unsolved puzzle (a comment on Kainge et al. 2013)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J-P Roux --- Lüderitz Marine Research, Namibia MR Wilhelm --- Marine Science Institute, USAMeasuring and forecasting recruitment are central to the understanding and management of fish stocks. Kainge et al. (2013) studied the effect of spawning stock size and environmental fluctuations on the recruitment levels of the Cape hake Merluccius capensis in Namibia... -
Insights into the diet of a poorly known species: pygmy killer whale Feresa attenuata from Cape Verde, West Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PR O'Dwyer --- Marine Biodiversity Research Group, Ireland S Berrow --- Marine Biodiversity Research Group, Ireland P López-Suárez --- Bios, C Oujo Lamao --- Bios,Despite having a worldwide distribution in tropical waters, knowledge on pygmy killer whales Feresa attenuata, including diet, is poor, with only a few studies carried out to date. The presence of otoliths and beaks in stomachs that have been examined... -
Rapid fish stock depletion in previously unexploited seamounts: the case of
Beryx splendens from the Sierra Leone Rise (Gulf of Guinea)Item type: Journal Article • Journal: African Journal of Marine Science • Authors: F Salmerón --- Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Málaga, Spain JC Báez --- Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Málaga, Spain D Macías --- Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Málaga, Spain L Fernandez-Peralta --- Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Málaga, Spain A Ramos --- IEO, Centro Oceanográfico de Vigo, Subida a Radio Faro, Vigo (Pontevedra), SpainFish stocks associated with seamounts may be particularly susceptible to overexploitation. From January to July 2001, the Spanish Oceanographic Institute (IEO) conducted an experimental fishing survey entitled ‘Palguinea-2001’ on the seamounts of the Sierra Leone Rise. Beryx splendens (commonly called... -
HER2 testing: ASCO/CAP guidelines and beyond – implications for South Africa
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: S J Nayler --- Gritzman and Thatcher Laboratory, South AfricaHER2 status in breast cancer has major significance in terms of prognostication and prediction of response to chemotherapeutic agents, as well as being an absolute indicator for the use of trastuzumab. Recent guidelines for the testing and interpretation for HER2... -
The Behaviour and Brain Function of the Cichlid Fish Hemihaplochromis Philander
Item type: Journal Article • Journal: Zoologica Africana • Authors: A.J. Ribbink --- Department of Zoology and Entomology,Forebrain extirpations from Hemihaplochromis philander (Pisces: Cichlidae) resulted in a decrease of aggressive (territorial), courtship, and spontaneous behaviour. The stimulus-response latency was found to be increased by the extirpations. Forebrainless males were unable to distinguish between male and female conspecifics... -
Feeding biology of the giant clingfish Chorisochismus dentex – implications for limpet populations
Item type: Journal Article • Journal: African Zoology • Authors: Y.A.R.G. Lechanteur --- Marine Biology Research Institute, South Africa K. Prochazka --- Marine Biology Research Institute, South AfricaThe behaviour of the giant clingfish, Chorisochismus dentex, feeding on limpets was investigated in the laboratory and in the field. Prey size and species preference were determined in captivity, and compared with observations of stomach contents obtained from fishes in... -
Fish associated with artificial reefs in False Bay, South Africa: a preliminary survey
Item type: Journal Article • Journal: African Zoology • Authors: Y.A.R.G Lechanteur --- Marine Biology Research Institute, South Africa C.L. Griffiths --- Marine Biology Research Institute, South AfricaThis study compares the suprabenthic fish assemblages inhabiting eight shipwrecks in False Bay with those found on adjacent natural reefs. 3411 fishes of 18 species were recorded on the wrecks. Species densities recorded on wrecks in both shallow and deep... -
Composition and seasonal variability of the suprabenthic reef-fish assemblage in False Bay, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Y.A.R.G. Lechanteur --- Marine Biology Research Institute, Department of Zoology, South Africa C.L. Griffiths --- Marine Biology Research Institute, Department of Zoology, South AfricaThe composition and seasonal variability of a False Bay suprabenthic reef-fish assemblage was investigated monthly at a protected reef site (to a depth of 25 m) for 14 months. In total, 25 484 fish from 28 species (26 demersal) were... -
Behaviour and habitat of the Indian Ocean amphibious blenny, Alticus monochrus
Item type: Journal Article • Journal: African Zoology • Authors: M. Bhikajee --- Faculty of Science, Mauritius J.M. Green --- Department of Biology, CanadaBehaviour and habitat of the Indian Ocean amphibious blenny, Alticus monochrus -
Assessment of catches in shore angling competitions from the border region of the Eastern Cape, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: P. Pradervand --- Oceanographic Research Institute, South Africa R.D. Govender --- Oceanographic Research Institute, South AfricaSeventeen years (1982 1998) of competitive shore angling catch and effort data from the Border region (Great Fish RiverKei River) of the Eastern Cape of South Africa were analysed. Of a total of 34 species recorded, the most commonly caught... -
Subsistence utilization of the crab Neosarmatium meinerti in the Kosi Lakes ecosystem, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Carsten Pedersen --- Andreas Bjorns gade 14, Denmark Bernadine I. Everett --- Oceanographic Research Institute, South Africa Peter J. Fielding --- FieldWork, South Africa Wendy D. Robertson --- Oceanographic Research Institute, South Africa Robert Kyle --- , South AfricaMembers of the rural communities living around the edges of the Kosi Lake system in northern KwaZulu Natal have been subsistence users of the resources of the lakes, estuary and surrounding swamp forest for many generations. Women and children dig... -
The role of estuarine type in characterizing early stage fish assemblages in warm temperate estuaries, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: N.A. Strydom --- Department of Ichthyology and Fisheries Science, South Africa A.K. Whitfield --- South African Institute for Aquatic Biodiversity, South Africa T.H. Wooldridge --- Department of Zoology, South AfricaAssemblages of early stage fishes (larval and early juvenile stages) were investigated and compared in seven permanently open and five intermittently open estuarine systems on the warm temperate Eastern Cape coast of South Africa. Estuarine type, by virtue of mouth... -
Life history traits of Bathyclarias nyasensis (Siluroidei) in Lake Malawi
Item type: Journal Article • Journal: African Zoology • Authors: E. Kaunda --- Department of Ichthyology and Fisheries Science, South Africa T. Hecht --- Department of Ichthyology and Fisheries Science, South AfricaLife history traits, including age, growth, reproduction and diet of Bathyclarias nyasensis from Lake Malawi were studied between December 1996 and November 1998. Owing to reabsorp tion of pectoral spines with increasing fish size, and the relatively low number of... -
A preliminary investigation of the effects of an Inter Basin Transfer on the ichthyofauna of a small river in northern KwaZulu-Natal,South Africa
Item type: Journal Article • Journal: African Zoology • Authors: A. Viljoen [AN0001] D.P. Cyrus --- Coastal Research Unit of Zululand, South AfricaA study was carried out to provide baseline data so that future impacts of an Inter Basin Transfer on the fish fauna of the Mvuzana River could be assessed. Seven species of fish were recorded, and all were present under... -
Long-term trends in the shore fishery of the Transkei coast, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: P. Pradervand --- Oceanographic Research Institute, South AfricaTwenty four years (1977 2000) of competition shore angling catch and effort data from the Natal Coastal Anglers Union for the Transkei were analysed. Of a total of 71 species recorded, the most commonly caught species were Pomatomus saltatrix (19%),... -
Investigation of a parasitic outbreak of Lernaea cyprinacea Linnaeus (Crustacea: Copepoda) in fish from Zimbabwe
Item type: Journal Article • Journal: African Zoology • Authors: Maxwel Barson [AN0001] Atridah Mulonga --- Department of Biological Sciences, Laboratory of Aquatic Ecology and Evolutionary Biology, Zimbabwe, Belgium Tamuka Nhiwatiwa --- Department of Biological Sciences, Laboratory of Aquatic Ecology and Evolutionary Biology, Zimbabwe, BelgiumInfestation of fish by the crustacean ectoparasite Lernaea cyprinacea Linnaeus, 1758 was investigated to establish the extent of infestation, potential effects of the parasite and its ecological adaptations. Fish samples were collected from impoundments in the Malilangwe Wildlife Reserve in... -
Asymmetric interspecific territorial competition over food resources amongst Lake Malawi cichlid fishes
Item type: Journal Article • Journal: African Zoology • Authors: Atsushi Maruyama --- Faculty of Science and Technology, Ryukoku University, Japan Bosco Rusuwa --- Department of Biology, Malawi Masahide Yuma --- Faculty of Science and Technology, Ryukoku University, JapanThe rock-dwelling cichlids in Lake Malawi comprise the most diverse freshwater fish community in the world. Individuals frequently interact with heterospecifics through feeding territoriality. Underwater observations and experiments were conducted to examine interspecific variation in the frequencies of territorial behaviour... -
Near-shore distribution of Heaviside’s (Cephalorhynchus heavisidii) and dusky dolphins (Lagenorhynchus obscurus) at the southern limit of their range in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: S.H. Elwen --- Mammal Research Institute, University of Pretoria, South Africa M. Thornton --- Mammal Research Institute, University of Pretoria, 0001 Pretoria c/o Iziko South African Museum, South Africa D. Reeb --- Mammal Research Institute, University of Pretoria, South Africa P.B. Best --- Mammal Research Institute, University of Pretoria, 0001 Pretoria c/o Iziko South African Museum, South AfricaPhoto-identification surveys over three years along 390 km of coastline north of Cape Town, revealed that Heaviside’s dolphin distribution was consistent between years and higher in areas more exposed to swells and with greater long-term availability of small hake Merluccius... -
Ecology of metazoan parasites of Clarias gariepinus (Osteichthyes: Clariidae) from the Nwanedi-Luphephe Dams of the Limpopo River System, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: G.N. Madanire-Moyo --- Department of Biodiversity, South Africa W.J. Luus-Powell --- Department of Biodiversity, South Africa P.A.S. Olivier --- Department of Biodiversity, South AfricaA total of 7748 parasites, belonging to 17 metazoan species, was recorded from 45 specimens of Clarias gariepinus (Burchell, 1822) caught from the Nwanedi-Luphephe Dams, Limpopo River System, South Africa. All host specimens were parasitized by one or more metazoan... -
Current distribution of the southern barred minnow, Opsaridium peringueyi (Pisces: Cyprinidae), in South Africa:Is there reason for concern?
Item type: Journal Article • Journal: African Zoology • Authors: J.A. Venter --- School of Biological and Conservation Sciences, South Africa P.S.O. Fouché --- Zoology Department, South Africa W. Vlok --- Centre for Aquatic Research, Department of Zoology, South AfricaIn South Africa, relatively small, but healthy populations of Opsaridium peringueyi remain in the middle reaches of the Luvuvhu, Blyde, Sabie and Pongolo Rivers. The species may be extinct in some rivers like the Shingwedzi and lower-Olifants and its status... -
Movement behaviour of alien largemouth bass Micropterus salmoides in the estuarine headwater region of the Kowie River, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Taryn S Murray --- South African Institute for Aquatic Biodiversity, South Africa Mandla L Magoro --- South African Institute for Aquatic Biodiversity, South Africa Alan K Whitfield --- South African Institute for Aquatic Biodiversity, South Africa Paul D Cowley --- South African Institute for Aquatic Biodiversity, South AfricaThe movement behaviour of largemouth bass Micropterus salmoides in the estuarine headwater region of the Kowie River, South Africa, was investigated using passive acoustic telemetry. Ten adult fish were tagged and released in four discrete pools below a weir that... -
Occurrence of Tetracampos ciliotheca (Cestoda: Bothriocephalidea) in the gall bladder of Clarias anguillaris in Burkina Faso
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Y Sinaré --- Laboratoire de Biologie et Ecologie Animales, Département de Biologie et Physiologie Animales, Burkina Faso M Boungou --- Laboratoire de Biologie et Ecologie Animales, Département de Biologie et Physiologie Animales, Burkina Faso A Ouéda --- Laboratoire de Biologie et Ecologie Animales, Département de Biologie et Physiologie Animales, Burkina Faso K Mano --- Laboratoire de Biologie et Ecologie Animales, Département de Biologie et Physiologie Animales, Burkina Faso WN Kpoda --- Laboratoire de Biologie et Ecologie Animales, Département de Biologie et Physiologie Animales, Burkina Faso NG Sakiti --- Département de Zoologie, Benin GB Kabré --- Laboratoire de Biologie et Ecologie Animales, Département de Biologie et Physiologie Animales, Burkina FasoThe presence of the bothriocephalidean cestode Tetracampos ciliotheca Wedl, 1861 is reported from the gall bladders of the catfish Clarias anguillaris from Loumbila and Ziga reservoirs, Burkina Faso, in 2010–2011. Of the 159 specimens examined, 47 were infected. Mean intensity... -
First survey of fishes in the Betty's Bay Marine Protected Area along South Africa's temperate south-west coast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Roberson --- Marine Research Institute, Department of Biological Sciences, South Africa H Winker --- South African National Biodiversity Institute, Kirstenbosch Research Centre, South Africa C Attwood --- Marine Research Institute, Department of Biological Sciences, South Africa L De Vos --- Marine Research Institute, Department of Biological Sciences, South Africa C Sanguinetti --- Percy FitzPatrick Institute of African Ornithology, South Africa A Götz --- Elwandle Node, South AfricaThis first survey of fish in the Betty's Bay Marine Protected Area (MPA), on the south coast of South Africa, was conducted using baited remote underwater video systems (BRUVs). A total of 58 deployments recorded 42 species in 20 km2, including... -
Response of instream animal communities to a short-term extreme event and to longer-term cumulative impacts in a strategic water resource area, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SH Foord --- Department of Zoology, Chair in Biodiversity Value and Change, Centre for Invasion Biology, South Africa PSO Fouché --- Department of Zoology, South AfricaDisturbance plays an integral part in generating heterogeneity required for ecosystem persistence, but the increased amplitude and duration of disturbances linked to drivers of global change could result in ecosystem shifts or collapse. Biomonitoring over time provides insights into trajectories... -
Observations of terrestrial locomotion in wild Polypterus senegalus from Lake Albert, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TY Du --- Redpath Museum, Canada HCE Larsson --- Redpath Museum, Canada EM Standen --- Department of Biology, CanadaPolypterids, the most basal actinopterygians, are a group of fish long-considered living fossils and holding a key position for understanding fish and tetrapod evolution. Knowledge of the natural history of Polypterus is limited, their having been studied in little detail... -
Physiological response of one of South Africa’s premier freshwater sport angling species, the Orange-Vaal smallmouth yellowfish Labeobarbus aeneus, to catch-and-release angling
Item type: Journal Article • Journal: African Zoology • Authors: Nico J Smit --- Water Research Group (Ecology), Unit for Environmental Sciences and Management, Potchefstroom Campus, South Africa Ruan Gerber --- Department of Zoology, Kingsway Campus, South Africa Richard Greenfield --- Department of Zoology, Kingsway Campus, South Africa Glyn Howatson --- Water Research Group (Ecology), Unit for Environmental Sciences and Management, Potchefstroom Campus, South AfricaThe practice of catch-and-release fishing has been widely promoted by angling fraternities as a fisheries manage- ment tool. The aim of this investigation was to determine the physiological response of Orange-Vaal smallmouth yellowfish, Labeobarbus aeneus, to catch-and-release angling in the... -
Characterisation of the dietary relationships of two sympatric hake species, Merluccius capensis and M. paradoxus, in the northern Benguela region using fatty acid profiles
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JA Iitembu --- Department of Fisheries and Aquatic Sciences, Namibia NB Richoux --- Department of Zoology and Entomology, South AfricaThe two sympatric species of Cape hake, Merluccius capensis and M. paradoxus, have been the main targets of bottom-trawl fisheries off Namibia for several decades. The feeding ecology of these hakes has been studied mainly using stomach content analyses and... -
Spatial characterisation of the Benguela ecosystem for ecosystem-based management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SP Kirkman --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa L Blamey --- Marine Research Institute, South Africa T Lamont --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa JG Field --- Marine Research Institute, South Africa G Bianchi --- Food and Agriculture Organization, Italy JA Huggett --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa L Hutchings --- Marine Research Institute, South Africa J Jackson-Veitch --- Marine Research Institute, South Africa A Jarre --- Marine Research Institute, South Africa C Lett --- Institut de Recherche pour le Développement [IRD], UMR MARBEC 248, France MR Lipiński --- Department of Ichthyology and Fisheries Science, South Africa SW Mafwila --- Department of Fisheries and Aquatic Sciences, Namibia MC Pfaff --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa T Samaai --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa LJ Shannon --- Marine Research Institute, South Africa Y-J Shin --- Marine Research Institute, South Africa CD van der Lingen --- Marine Research Institute, South Africa D Yemane --- Marine Research Institute, South AfricaThe three countries of the Benguela Current Large Marine Ecosystem (BCLME), namely Angola, Namibia and South Africa, have committed to implementing ecosystem-based management (EBM) including an ecosystem approach to fisheries (EAF) in the region, to put in practice the principles... -
Morphometric variation in the cutlassfish Trichiurus lepturus on the Kenyan coast: implications for stock identification and management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SM Mwakiti --- University of Eldoret, Kenya B Kaunda-Arara --- University of Eldoret, Kenya CM Mlewa --- Pwani University, Kenya R Ruwa --- Kenya Marine Fisheries Research Institute, KenyaMorphometric variation was used to study population structure of the cutlassfish Trichiurus lepturus on the Kenyan coast. In all, 16 morphometric measurements taken from 193 individuals from six sites were subjected to multivariate statistical analysis in order to determine possible... -
Age and growth of Cape stumpnose Rhabdosargus holubi (Pisces: Sparidae) in the Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MW Farthing --- Department of Ichthyology and Fisheries Science, South Africa NC James --- South African Institute for Aquatic Biodiversity, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaRhabdosargus holubi is a small (maximum weight=2.4 kg) yet important fishery species in the estuaries of the south-east coast of South Africa. Little is known of its biology and specifically its growth rate, which is essential for sustainable management of the... -
Anchoring to determine negotiated catch limits: a case study of an industrial fishery in Oman
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: HS Al-Masroori --- Department of Marine Science and Fisheries, Sultanate of Oman S Bose --- Department of Natural Resource Economics, Sultanate of OmanDespite refinement in scientific methods of setting total allowable catches (TACs), the choice of values is affected by uncertainty that arises as a result of incomplete information and the behavioural intentions of resource users, among others. In this context, this... -
Influence of the annual flood-pulse on catch per unit effort, condition and reproduction of Clarias gariepinus from the upper Okavango Delta, Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Bokhutlo --- Department of Biology and Biotechnological Sciences, Botswana OLF Weyl --- South African Institute for Aquatic Biodiversity, South Africa K Mosepele --- Okavango Research Institute (University of Botswana), Botswana GG Wilson --- Ecosystem Management, School of Environmental and Rural Science, AustraliaCatch per unit effort (CPUE), length, weight and maturity data for Clarias gariepinus were collected during monthly gillnet surveys in the upper Okavango Delta between 2001 and 2009 to investigate their relationship with the annual flood-pulse. CPUE, condition factor (K)... -
Past and present fish species recorded in the estuarine Lake Ichkeul, northern Tunisia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Shaiek --- Research Unit Ecosystems and Aquatic Resources (UR13AGRO1), National Agronomy Institute of Tunisia (INAT), Tunisia C Fassatoui --- Research Unit Ecosystems and Aquatic Resources (UR13AGRO1), National Agronomy Institute of Tunisia (INAT), Tunisia MS Romdhane --- Research Unit Ecosystems and Aquatic Resources (UR13AGRO1), National Agronomy Institute of Tunisia (INAT), TunisiaLake Ichkeul in northern Tunisia is a Ramsar site, a MAB Biosphere Reserve and a UNESCO World Heritage Site. The system is one of the most important coastal wetlands in North Africa, especially as an over-wintering area for migratory birds,... -
Nile perch and the transformation of Lake Victoria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Taabu-Munyaho --- National Fisheries Resources Research Institute (NaFIRRI), Uganda BE Marshall --- Lake Victoria Fisheries Organisation (LVFO), New Zealand T Tomasson --- United Nations University – Fisheries Training Programme (UNU–FTP), Marine Research Institute, Iceland G Marteinsdottir --- Institute of Biology, IcelandThe transformation of Lake Victoria that began in 1980 followed the population explosion of Nile perch Lates niloticus, causing the apparent extirpation of 500+ endemic haplochromine species and dramatic physico-chemical changes. Officially introduced in 1962–1963, but present earlier, the reasons... -
Extensive netting in Albasini and Nandoni dams: a potential threat to fish as a sustainable food source in the Vhembe District, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: IEJ Barnhoorn --- Department of Zoology, South Africa JC van Dyk --- Department of Zoology, South Africa GM Wagenaar --- Department of Zoology, South AfricaFish populations in Albasini and Nandoni dams are negatively affected by extensive netting practices. This observation was made by the authors following a number of fish health assessment surveys related to aquatic pollution in the Luvuvhu River catchment. A comparison... -
Population parameters and exploitation rate of Sarotherodon galilaeus galilaeus (Cichlidae) in Lakes Doukon and Togbadji, Benin
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D Lederoun --- Laboratory of Functional and Evolutionary Morphology, Belgium P Vandewalle --- Laboratory of Functional and Evolutionary Morphology, Belgium AA Brahim --- Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, Benin J Moreau --- Department of Aquatic Environment, France PA Lalèyè --- Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, BeninGrowth, mortality, recruitment and relative yield per recruit of Sarotherodon galilaeus galilaeus from Lakes Doukon and Togbadji were studied. Data on total length, total weight and sex were recorded on a monthly basis between January and December 2013 for S... -
Influence of prey abundance and abiotic factors on the long-term home-range and movement dynamics of spotted grunter Pomadasys commersonnii in an intermittently open estuary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BA Maree --- Department of Ichthyology and Fisheries Science, South Africa PD Cowley --- Department of Ichthyology and Fisheries Science, South Africa TF Næsje --- South African Institute for Aquatic Biodiversity, South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa AI Terörde --- Arcus Consulting, South Africa EB Thorstad --- Norwegian Institute for Nature Research, NorwayLong-term home-range and movement dynamics of spotted grunter Pomadasys commersonnii and the distribution of their dominant prey, the sandprawn Callichirus kraussi, were investigated in the intermittently open East Kleinemonde Estuary, South Africa. In addition, the effects of fish length, diel... -
Structure and dynamics of demersal fish assemblages over three decades (1985–2012) of increasing fishing pressure in Guinea
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ML Camara --- Centre National des Science Halieutiques de Boussoura (CNSHB), Republic of Guinea B Mérigot --- Université de Montpellier, France F Leprieur --- Université de Montpellier, France JA Tomasini --- Université de Montpellier, France I Diallo --- Centre National des Science Halieutiques de Boussoura (CNSHB), Republic of Guinea M Diallo --- Centre National des Science Halieutiques de Boussoura (CNSHB), Republic of Guinea D Jouffre --- Institut de Recherche pour le Développement, SenegalIn a context of growing fishing pressures and recommendations for an ecosystem approach to fisheries, there is a need to monitor changes in fish communities over time. In this study, we analysed data from scientific trawl surveys carried out on... -
Health assessment of freshwater fish species from Albasini Dam, outside a DDT-sprayed area in Limpopo province, South Africa: a preliminary study
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: UMC Nibamureke --- Department of Zoology, South Africa IEJ Barnhoorn --- Department of Zoology, South Africa GM Wagenaar --- Department of Zoology, South AfricaDuring 2006 to 2008, the water, sediment and fish in Albasini Dam, used as a reference site outside a DDT-sprayed area, had been found to be as affected as those in the nearby DDT-sprayed area were. Accordingly, the aim of... -
Penaeid and carid community changes in the St Lucia estuarine lake system, South Africa, under low water level, extended closed periods and marine reconnection conditions
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GP Tweddle --- Coastal Research Unit of Zululand, Department of Zoology, South Africa DP Cyrus --- Coastal Research Unit of Zululand, Department of Zoology, South Africa L Vivier --- Coastal Research Unit of Zululand, Department of Zoology, South AfricaPenaeid and carid communities were assessed in St Lucia over a wide range of saline conditions, water level conditions and mouth states, including a six-month marine connection and various connections to the Mfolozi Estuary. Samples were collected biannually in spring... -
Dark times for dageraad Chrysoblephus cristiceps: evidence for stock collapse
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Parker --- Department of Biological Sciences, South Africa H Winker --- South African National Biodiversity Institute, South Africa CG Attwood --- Department of Biological Sciences, South Africa SE Kerwath --- Department of Biological Sciences, South AfricaThe declaration of a state of emergency in the South African linefishery in 2000 has had a positive impact on a few overexploited endemic seabreams (Family Sparidae). However, the population of the reef-dwelling dageraad Chrysoblephus cristiceps has been unresponsive to... -
Monitoring the recovery of a previously exploited surf-zone fish community in the St Lucia Marine Reserve, South Africa, using a no-take sanctuary area as a benchmark
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- Oceanographic Research Institute, South Africa H Winker --- South African National Biodiversity Institute, South Africa JQ Maggs --- Oceanographic Research Institute, South Africa SN Porter --- Oceanographic Research Institute, South AfricaLimiting accessibility to a fishing area can reduce fishing effort effectively and may therefore promote local recovery of depleted stocks. In January 2002, beach driving was banned in South Africa, thereby reducing angler access to large areas of the coastline,... -
Bioaccumulation of heavy metals in two morphotypes of African large barb Labeobarbus intermedius (Osteichthyes: Cyprinidae) in Lake Hawassa, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Sorsa --- Department of Biology, College of Natural and Computational Sciences, Ethiopia A Gezahagn --- Ethiopian Rift Valley Lakes Basin Authority, Ethiopia E Dadebo --- Department of Biology, College of Natural and Computational Sciences, EthiopiaWater and muscle tissue samples from two morphotypes of the African large barb Labeobarbus intermedius collected from three sites in Lake Hawassa in 2012–2013 were analysed for eight heavy metals, including Cd, Co, Cr, Cu, Mn, Ni, Pb and Zn... -
Organochlorine pesticides in Cyprinus carpio from Sidi Salem Dam, north-western Tunisia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Mzoughi --- Institut National des Sciences et Technologies de la Mer, Laboratoire Milieu Marin, R Ennouri --- Institut National des Sciences et Technologies de la Mer, Laboratoire Milieu Marin, L Chouba --- Institut National des Sciences et Technologies de la Mer, Laboratoire Milieu Marin,Cyprinus carpio (Linnaeus, 1758) caught in Sidi Salem Dam in 2011 were analysed for the levels of organochlorine pesticides (OCPs), including hexachlorobenzene (HCB), aldrin, heptachlor, lindane, dieldrin, endrin, and pp′-DDT and its two main metabolites pp′-DDD and pp′-DDE, in order... -
Distribution and community structure of Ostracoda (Crustacea) in shallow waterbodies of southern Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: B Rumes --- Limnology Unit, Department of Biology, Belgium T Van der Meeren --- Limnology Unit, Department of Biology, Belgium K Martens --- Limnology Unit, Department of Biology, Belgium D Verschuren --- Limnology Unit, Department of Biology, BelgiumThe current study presents the ostracod communities recovered from 26 shallow waterbodies in southern Kenya, combined with an ecological assessment of habitat characteristics. A total of 37 waterbodies were sampled in 2001 and 2003, ranging from small ephemeral pools to... -
Using stable isotope analysis to study the diet of Gilchristella aestuaria larvae: preliminary insights into the foodwebs of six South African estuaries
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D Costalago --- Department of Ecology, Environment and Plant Sciences, Sweden NAF Miranda --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Zoology, South Africa NA Strydom --- Department of Zoology, South Africa R Perissinotto --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Zoology, South AfricaSouth African estuarine systems are becoming increasingly altered by anthropogenic and environmental factors, but the consequences of such changes for these systems are still not fully understood. The most common approach for evaluating the ecological status of aquatic systems is... -
Impacts of cage culture on physico-chemical and bacteriological water quality in Lake Volta, Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MNK Clottey --- Department of Marine and Fisheries Sciences, R Asmah --- Council for Scientific and Industrial Research, Water Research Institute, PK Ofori-Danson --- Department of Marine and Fisheries Sciences, MY Ameworwor --- Department of Marine and Fisheries Sciences, AY Karikari --- Council for Scientific and Industrial Research, Water Research Institute,The effects of cage fish farming on physico-chemical and bacteriological water quality in Lake Volta, Ghana, were investigated in 2013–2014. Farmed and unfarmed (control) areas of the lake were selected for monitoring. Nutrients, temperature, dissolved oxygen, conductivity, turbidity, pH, total... -
Assessing trophic adaptability is critical for understanding the response of predatory fishes to climate change: a case study of Pomatomus saltatrix in a global hotspot
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WM Potts --- Department of Ichthyology and Fisheries Science, South Africa RSJ Bealey --- Department of Ichthyology and Fisheries Science, South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South AfricaThere is a growing need to incorporate biotic interactions, particularly those between predators and their prey, when predicting climate-driven shifts in marine fishes. Predators dependent on a narrow range of prey species should respond rapidly to shifts in the distribution... -
Ocean robotics in support of fisheries research and management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Swart --- Ocean Systems and Climate, South Africa JJ Zietsman --- Defence, Peace, Safety and Security, South Africa JC Coetzee --- Branch: Fisheries Management, South Africa DG Goslett --- Defence, Peace, Safety and Security, South Africa A Hoek --- Sea Technology Services (Pty) Ltd, South Africa D Needham --- Sea Technology Services (Pty) Ltd, South Africa PMS Monteiro --- Ocean Systems and Climate, South AfricaSouth Africa’s small-pelagic fishery is a socio-economically important component of the country’s commercial fisheries sector, second in value only to the demersal trawl fishery. Management of this sector relies on infrequent hydro-acoustic surveys, which provide measures of anchovy Engraulis encrasicolus... -
Seasonally and spatially referenced estimates of recreational shore-angling effort, catch composition, catch rates and total catch in the Goukamma Marine Protected Area, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CG Attwood --- Department of Biological Sciences, South Africa CS van Zyl --- Department of Nature Conservation, Faculty of Natural Resource Management, South Africa AT Lombard --- Institute for Coastal and Marine Research, Nelson Mandela Metropolitan University, South Africa C McCagh --- School of Animal Biology, Faculty of Natural and Agricultural Sciences, AustraliaA roving creel survey of the recreational shore fishery along the 16.4-km coastline in the Goukamma Marine Protected Area on the south coast of South Africa was conducted from 2009 to 2011. Some 838 patrols were stratified equally among months,... -
Factors determining the occurrence of Pleurodeles poireti (Caudata: Salamandridae) on Edough Peninsula, northeastern Algeria
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Jihène Ben Hassine --- , , Tunisia Daniel Escoriza --- , , Spain Badis Bakhouche --- , , AlgeriaPleurodeles poireti is one of the lesser-known amphibians in the Mediterranean region. This species is strictly endemic to the Edough Peninsula in northeastern Algeria. Here we investigated the factors that determine the presence of P. poireti, by affecting its selection... -
Acoustic fish biomass assessment in a deep Tunisian reservoir: effects of season and diel rhythm on survey results
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: I Djemali --- Institut National des Sciences et Technologies de la Mer, Tunisia H Laouar --- Centre Technique de l’Aquaculture, TunisiaTo determine the best acoustic sampling period for obtaining fish biomass estimates of a Mediterranean deep reservoir in Tunisia, day and night surveys were performed in spring (April), summer (September), autumn (December) and winter (March). A Simrad EK60 echosounder, equipped... -
Sheddable armour: identification of osteoderms in the integument of Geckolepis maculata (Gekkota)
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Daniel J. Paluh --- , , USA Aaron H. Griffing --- , , USA Aaron M. Bauer --- , , USAOsteoderms are bony deposits that form within the dermal layer of skin in vertebrates. Within geckos, osteoderms are uncommon, only described in Gekko gecko and the genus Tarentola. A previous report of osteoderms in the Afro-Malagasy gekkonid genus Geckolepis has... -
Significant genetic differentiation among meroplanktonic barrel jellyfish Rhizostoma pulmo (Cnidaria: Scyphozoa) in the Mediterranean Sea
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AR Ben Faleh --- Marine Biology Unit, Faculty of Sciences of Tunis, Tunisia H Allaya --- Marine Biology Unit, Faculty of Sciences of Tunis, Tunisia A Armani --- FishLab, Department of Veterinary Sciences, Italy AAB Shahin --- Department of Zoology, Faculty of Science, EgyptMolecular data have shown that jellyfishes are more geographically restricted and evolutionarily divergent than previously thought. We examined genetic variation and divergence within the meroplanktonic barrel jellyfish Rhizostoma pulmo in the Mediterranean Sea; specific sampling areas were the northern Adriatic,... -
Patterns and trends in seabird bycatch in the pelagic longline fishery off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: DP Rollinson --- FitzPatrick Institute of African Ornithology, DST/NRF Centre of Excellence, South Africa RM Wanless --- FitzPatrick Institute of African Ornithology, DST/NRF Centre of Excellence, South Africa PG Ryan --- FitzPatrick Institute of African Ornithology, DST/NRF Centre of Excellence, South AfricaBoth foreign and domestic pelagic longline fishing vessels operate in South Africa’s Exclusive Economic Zone and adjacent international waters where they kill hundreds of seabirds each year as bycatch. To update assessments of the impact of the pelagic longline fishery... -
Genetic stock structure of white steenbras Lithognathus lithognathus (Cuvier, 1829), an overexploited fishery species in South African waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RH Bennett --- South African Institute for Aquatic Biodiversity, South Africa K Reid --- Molecular Ecology and Evolution Programme, Department of Genetics, South Africa G Gouws --- South African Institute for Aquatic Biodiversity, South Africa P Bloomer --- Molecular Ecology and Evolution Programme, Department of Genetics, South Africa PD Cowley --- South African Institute for Aquatic Biodiversity, South AfricaWhite steenbras Lithognathus lithognathus (Teleostei: Sparidae) is an overexploited marine fish species endemic to South Africa. Overexploitation in recreational, subsistence and commercial fisheries has resulted in stock collapse and the need for improved management of the species. Adults are thought... -
Philopatry and dispersal of juvenile leervis Lichia amia (Teleostei: Carangidae) tagged in a warm-temperate South African estuary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Murray --- South African Institute for Aquatic Biodiversity, South Africa P Cowley --- South African Institute for Aquatic Biodiversity, South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa R Bennett --- South African Institute for Aquatic Biodiversity, South AfricaUnderstanding and characterising movement and area-use patterns of fishes within estuaries, as well as understanding the degree of connectivity between estuaries and the marine environment, can provide important insights into a species’ ecology, which is fundamental for effective management and... -
Distribution, abundance and population structure of Hexaplex trunculus and Bolinus brandaris (Gastropoda: Muricidae) in offshore areas of the Gulf of Gabès, southern Tunisia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Elhasni --- Institut National des Sciences et Technologies de la Mer, Tunisia P Vasconcelos --- Instituto Português do Mar e da Atmosfera, Portugal K Dhieb --- Institut National des Sciences et Technologies de la Mer, Tunisia H El Lakhrach --- Institut National des Sciences et Technologies de la Mer, Tunisia M Ghorbel --- Institut National des Sciences et Technologies de la Mer, Tunisia O Jarboui --- Institut National des Sciences et Technologies de la Mer, TunisiaThe banded murex Hexaplex trunculus and purple dye murex Bolinus brandaris are frequently caught as bycatch by bottom trawlers operating in the Gulf of Gabès, southern Tunisia. Although these muricid gastropods might importantly constitute an additional source of income for... -
Estuarine and coastal connectivity of an estuarine-dependent fishery species, Pomadasys commersonnii (Haemulidae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MH Dames --- Department of Ichthyology and Fisheries Science, South Africa PD Cowley --- South African Institute for Aquatic Biodiversity, South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa RH Bennett --- South African Institute for Aquatic Biodiversity, South Africa EB Thorstad --- Norwegian Institute for Nature Research, Norway TF Næsje --- Norwegian Institute for Nature Research, NorwayUnderstanding the level of connectivity between estuarine and coastal waters is essential for appropriate management of estuarine-associated taxa. Most studies have focused on the role of a single estuary, while limited research exists on the importance of multiple estuaries to... -
The ecological integrity of the Lower Olifants River, Limpopo province, South Africa: 2009–2015 – Part A: Olifants River main stem
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Marr --- South African Institute for Aquatic Biodiversity, South Africa TD Mohlala --- SAEON Ndlovu Node, Kruger National Park, South Africa A Swemmer --- SAEON Ndlovu Node, Kruger National Park, South AfricaThe major rivers of the South African ‘Lowveld’ (low-latitude savanna) suffer numerous impacts from upstream economic activities. Whereas monitoring these rivers is required to detect biodiversity losses, record pollution events and devise mitigation strategies, current monitoring programmes are inadequate. In... -
Tono Reservoir fishery contribution to poverty reduction among fishers in northern Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DN Akongyuure --- Department of Fisheries and Watershed Management, Faculty of Renewable Natural Resources, Ghana S Amisah --- Department of Fisheries and Watershed Management, Faculty of Renewable Natural Resources, Ghana TK Agyemang --- Department of Fisheries and Watershed Management, Faculty of Renewable Natural Resources, Ghana RE Edziyie --- Department of Fisheries and Watershed Management, Faculty of Renewable Natural Resources, GhanaFishery characteristics and livelihood status of fishers at Tono Reservoir, Ghana, were investigated between January 2015 and June 2016. Data on fisher demography, fishing gears, fishing methods, perceptions of the state of fish stocks, management practices, income and consumption of... -
The ecological integrity of the lower Olifants River, Limpopo province, South Africa: 2009–2015 – Part B: Tributaries of the Olifants River
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Marr --- South African Institute for Aquatic Biodiversity, South Africa TD Mohlala --- SAEON Ndlovu Node, Kruger National Park, South Africa A Swemmer --- SAEON Ndlovu Node, Kruger National Park, South AfricaMonitoring on the Lowveld reaches of the Olifants River, Limpopo River System, and its Steelpoort, Blyde, Klaserie and Selati tributaries was initiated in 2009. Analysis of the 2009–2015 data from four Olifants River sites showed deterioration in the river’s ecological... -
Space use by Rhabdosargus holubi in a southern African estuary, with emphasis on fish movements and ecosystem connectivity
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GN Grant --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa RH Bennett --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa TS Murray --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa AK Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaTwenty-one juvenile Cape stumpnose Rhabdosargus holubi (140–190 mm fork length) were tagged with internal acoustic transmitters in the lower, middle and upper reaches of the Kowie Estuary, South Africa. The movements of each fish were continually monitored from October 2014... -
When plenty is not enough: an assessment of the white stumpnose (Rhabdosargus globiceps) fishery of Saldanha Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Parker --- Fisheries Management Branch, Department of Agriculture, South Africa SE Kerwath --- Fisheries Management Branch, Department of Agriculture, South Africa TF Næsje --- Norwegian Institute for Nature Research (NINA), Norway CJ Arendse --- South African National Parks, Rondevlei Scientific Services (Garden Route National Park), South Africa FJ Keulder-Stenevik --- Sars Centre for Marine Molecular Biology, Norway K Hutchings --- Anchor Environmental Consultants, South Africa BM Clark --- Anchor Environmental Consultants, South Africa H Winker --- Fisheries Management Branch, Department of Agriculture, South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa CG Attwood --- Department of Biological Sciences, South AfricaWhite stumpnose Rhabdosargus globiceps is the main target of the linefishery in Saldanha Bay. Increased fishing pressure over the last three decades, particularly by the recreational sector, has led to concerns regarding sustainability of the local white stumpnose stock. The... -
Eelgrass beds and bare substrata – sparid and mugilid composition in contrasting littoral estuarine habitats
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Pollard --- Department of Zoology and Entomology, South Africa AN Hodgson --- Department of Zoology and Entomology, South Africa HM Kok --- Port Elizabeth Museum, South Africa AK Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaSeagrass beds serve as nursery grounds for many fish species and often play an important role in the juvenile stages of economically and recreationally important fishes. The eelgrass Zostera capensis is the dominant submerged macrophyte in permanently open South African... -
Birds as major predators of fishes in the East Kleinemonde Estuary
Item type: Journal Article • Journal: African Zoology • Authors: Paul D Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa Anja I Terörde --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa Alan K Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaThis study provides a quantitative account of fish predation by piscivorous birds in the temporarily open/closed East Kleinemonde Estuary and represents the first global attempt to simultaneously relate such consumption to production by a fish community in the same estuary... -
Human health risks of metals and metalloids in muscle tissue of Synodontis zambezensis Peters, 1852 from Flag Boshielo Dam, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JR Sara --- Department of Biodiversity, South Africa SM Marr --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa WJ Smit --- Department of Biodiversity, South Africa LJC Erasmus --- Department of Physiology and Environmental Health, South Africa WJ Luus-Powell --- Department of Biodiversity, South AfricaMuscle tissue from 63 Synodontis zambezensis collected bimonthly in 2013 at Flag Boshielo Dam were analysed for metals and metalloids in a desktop human health risk assessment. The Hazard Quotient, based on a weekly meal of 67 g of fish... -
Use of otolith-shape analysis for stock discrimination of Boops boops along the Algerian coast (southwestern Mediterranean Sea)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Ider --- Laboratoire de Zoologie Appliquée et d’Ecophysiologie Animale, Faculté des Sciences de la Nature et de la Vie, Algeria Z Ramdane --- Laboratoire de Zoologie Appliquée et d’Ecophysiologie Animale, Faculté des Sciences de la Nature et de la Vie, Algeria K Mahé --- Laboratoire Ressources Halieutiques de Boulogne, France JL Duffour --- Laboratoire Ressources Halieutiques de Boulogne, France M Bacha --- Laboratoire d’Océanologie et de Géosciences – Centre National de la Recherche Scientifique (CNRS), France R Amara --- Laboratoire d’Océanologie et de Géosciences – Centre National de la Recherche Scientifique (CNRS), FranceOtolith-shape analysis was examined to determine its utility for biological stock identification of the bogue Boops boops along the Algerian coast of the Mediterranean Sea. The outlines of 179 sagittal otolith pairs from fish collected at three locations (Oran, Bejaia... -
Fishery benefits from exploiting spawning aggregations not solely dependent on enhanced fish density
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Robinson --- Australian Research Council (ARC) Centre of Excellence for Coral Reef Studies, Australia NAJ Graham --- Australian Research Council (ARC) Centre of Excellence for Coral Reef Studies, Australia A Grüss --- Department of Marine Biology and Ecology, Rosenstiel School of Marine and Atmospheric Science, USA C Gerry --- Seychelles Fishing Authority, Seychelles J Bijoux --- Seychelles Fishing Authority, SeychellesThe vulnerability of spawning aggregations to exploitation varies among fisheries as a result of differences in the population-density changes associated with this behaviour. However, vulnerability to fishing is also influenced by technology, environmental factors, and fish and fisher behaviours. Focusing... -
Phylogeny of the Sepia officinalis species complex in the eastern Atlantic extends the known distribution of Sepia vermiculata across the Benguela upwelling region
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AJE Healey --- Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, Wales NJ McKeown --- Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, Wales WM Potts --- Department of Ichthyology and Fisheries Science, South Africa CL de Beer --- Department of Ichthyology and Fisheries Science, South Africa W Sauer --- Department of Ichthyology and Fisheries Science, South Africa PW Shaw --- Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, WalesAccurate species identification and biogeographic characterisation are fundamental for appropriate management of expanding cephalopod fisheries. This study addresses this topic within the common cuttlefish Sepia officinalis species complex (S. officinalis, S. hierredda and S. vermiculata), with an emphasis on occurrence... -
Changes in recreational shore anglers’ attitudes towards, and awareness of, linefish management along the KwaZulu-Natal coast, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RW Kramer --- Oceanographic Research Institute (ORI), South Africa BQ Mann --- Oceanographic Research Institute (ORI), South Africa SW Dunlop --- Oceanographic Research Institute (ORI), South Africa JB Mann-Lang --- Oceanographic Research Institute (ORI), South Africa D Robertson-Andersson --- School of Life Sciences, South AfricaManagement of recreational fisheries cannot be based on biological and stock assessment data alone but needs to include appropriate social aspects (including knowledge, attitudes and behaviour) of anglers within the fishery. The primary purpose of this study was to evaluate... -
Focusing on monofilament nets while overlooking the priorities of artisanal fisheries governance in Senegal
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Thiao --- Centre de Recherches Océanographiques de Dakar-Thiaroye (CRODT), Senegal A Mbaye --- Centre de Recherches Océanographiques de Dakar-Thiaroye (CRODT), Senegal M Dème --- Centre de Recherches Océanographiques de Dakar-Thiaroye (CRODT), Senegal HD Diadhiou --- Centre de Recherches Océanographiques de Dakar-Thiaroye (CRODT), SenegalDespite its legal prohibition since 1998, the nylon monofilament net is still widely used in Senegalese artisanal fisheries. To achieve a complete ban on monofilament use, it is necessary to understand the main arguments for its continued use and what... -
Heavy metal concentrations in, and human health risk assessment of, three commercially valuable fish species in the lower Niger River, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JC Madu --- Department of Zoology and Environmental Biology, Nigeria GE Odo --- Department of Zoology and Environmental Biology, Nigeria CN Asogwa --- Department of Zoology and Environmental Biology, Nigeria CD Nwani --- Department of Zoology and Environmental Biology, NigeriaThe concentrations of Fe, Mn, Ni, Pb and V in water, sediment and the gill, liver and muscle tissues of Synodontis resupinatus, Heterotis niloticus and Clarias gariepinus, all commercially important fish species of the lower Niger River, were investigated in... -
Effect of large weirs on abundance and diversity of migratory Labeobarbus species in tributaries of Lake Tana, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: G Shewit --- Fisheries, Wetlands and Wildlife Management Department, Ethiopia A Getahun --- Department of Zoological Sciences, Ethiopia W Anteneh --- Biology Department, Ethiopia B Gedif --- Institute of Disaster Risk Management and Food Security Studies, Bahir Dar University, Ethiopia B Gashu --- Fisheries, Wetlands and Wildlife Management Department, Ethiopia B Tefera --- Agricultural Economics Department, Ethiopia Z Berhanie --- Agricultural Economics Department, Ethiopia D Alemaw --- Faculty of Civil and Water Resource Engineering, EthiopiaLake Tana has a remarkable fish diversity, including 17 endemic Labeobarbus species, of which nine spawn in the inflowing rivers. Three of the migratory species are threatened, namely the endangered Labeobarbus macrophtalmus and the vulnerable L. acutirostris and L. platydorsus... -
Systematic reinstatement of Schilbe depressirostris (Peters, 1852), based on differences in DNA barcoding and morphology, from Schilbe intermedius Rüppell, 1832 (Siluriformes, Schilbeidae)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HF van der Bank --- African Centre for DNA Barcoding, Kingsway Campus, South Africa BS Bezeng --- African Centre for DNA Barcoding, Kingsway Campus, South Africa PH Skelton --- South African Institute for Aquatic Biodiversity, South AfricaClimate change poses an unprecedented threat to biodiversity worldwide. Consequently, unrecognised taxa may not receive adequate conservation attention to survive. We used molecular and morphological data to address the challenge of species delimitation within the genus Schilbe. The presence or... -
Age and growth of narrow-barred Spanish mackerel Scomberomorus commerson in the coastal waters of southern Mozambique and KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: B Lee --- Oceanographic Research Institute (ORI), South Africa BQ Mann --- Oceanographic Research Institute (ORI), South AfricaThe narrow-barred Spanish mackerel Scomberomorus commerson is one of the most important linefish species caught in KwaZulu-Natal and southern Mozambique waters, forming the basis of important commercial, artisanal and recreational fisheries. A total of 439 S. commerson were sampled along... -
Multi-stakeholder collaboration yields valuable data for cetacean conservation in Gamba, Gabon
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: G Minton --- WWF Gabon, Gabon JR Kema Kema --- WWF Gabon, Gabon A Todd --- Gabon Biodiversity Program, Center for Conservation and Sustainability, Gabon L Korte --- Gabon Biodiversity Program, Center for Conservation and Sustainability, Gabon PB Maganga --- WWF Gabon, Gabon JR Migoungui Mouelet --- Brigade de Peche de Gamba/Department des Pêches et d’Aquaculture, Gabon AM Nguema --- Agence National des Parc Nationaux, Gabon E Moussavou --- Brigade de Peche de Gamba/Department des Pêches et d’Aquaculture, Gabon GK Nguélé --- Agence National des Parc Nationaux, GabonPrivate industry, the Government of Gabon and two international NGOs collaborated to conduct marine surveys off the coast of Gabon, Central Africa. Surveys addressed multiple objectives of surveillance and monitoring, the documentation of the distribution of and threats to the... -
The ‘suitcase hypothesis’: Can entrainment of meroplankton by eddies provide a pathway for gene flow between Madagascar and KwaZulu-Natal, South Africa?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Ockhuis --- Cape Peninsula University of Technology, South Africa JA Huggett --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa G Gouws --- African Coelacanth Ecosystem Programme (ACEP), South Africa C Sparks --- Cape Peninsula University of Technology, South AfricaSimilarities in the marine fauna found off the coasts of southern Madagascar and KwaZulu-Natal Province (KZN), South Africa, led to the development of the ‘suitcase project,’ with the aim of establishing whether eddies that form off southern Madagascar may package... -
Reflection on the first five years of South Africa’s Acoustic Tracking Array Platform (ATAP): status, challenges and opportunities
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa RH Bennett --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa TS Murray --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaThe Acoustic Tracking Array Platform (ATAP) is a marine science programme that monitors the movements and migrations of inshore marine animals along the South African coastline. Acoustically tagged animals are monitored by an expanded network of approximately 100 automated data-logging... -
Comparative genetic structure in two high-dispersal prawn species from the south-west Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TK Mkare --- Kenya Marine and Fisheries Research Institute, Kenya JC Groeneveld --- Oceanographic Research Institute (ORI), South Africa PR Teske --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South Africa CA Matthee --- Evolutionary Genomics Group, Department of Botany and Zoology, South AfricaThe penaeid prawns Fenneropenaeus indicus and Metapenaeus monoceros support shallow-water prawn fisheries in the south-west Indian Ocean. They are sympatric and have similar life histories, including developmental stages that depend on estuarine and marine habitats and a short dispersal duration... -
Movement patterns of an endangered fishery species, Lithognathus lithognathus (Sparidae), and the role of no-take marine protected areas as a management tool
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RH Bennett --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa A-R Childs --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa CG Attwood --- Department of Biological Sciences, South Africa L Swart --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa TF Næsje --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaUnderstanding movement behaviour is essential for effective management of fishery species. Dart tags were used to study coastal movement patterns of white steenbras Lithognathus lithognathus, an overexploited seabream (Sparidae) in South Africa. In total, 6 962 fish (190–1 080 mm... -
The impact of river flooding and high flow on the demersal fish assemblages of the freshwater-dominated Great Fish Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P Nodo --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa NC James --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa MDV Nakin --- Department of Biological and Environmental Sciences, South AfricaFreshwater inflow has a strong impact on the biological, chemical and physical characteristics of estuaries, which in turn affect the distribution and abundance of estuarine organisms. Increased climatic variability associated with climate change is predicated to modify precipitation patterns, which... -
Population connectivity of an overexploited coastal fish, Argyrosomus coronus (Sciaenidae), in an ocean-warming hotspot
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Henriques --- Evolutionary Genomics Group, Department of Botany and Zoology, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South Africa CV Santos --- Faculdade de Ciências da Universidade Agostinho Neto (FCUAN), Angola WHH Sauer --- Department of Ichthyology and Fisheries Science, South Africa PW Shaw --- Department of Ichthyology and Fisheries Science, South AfricaThe West Coast dusky kob Argyrosomus coronus is a commercially exploited fish with a distribution confined to the Angola–Benguela Frontal Zone (ABFZ) of the southeastern Atlantic Ocean. A previous study revealed that during a recent period of local warming the... -
Intraspecific cleaning by juvenile Cape white seabream Diplodus capensis (Sparidae) off eastern South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PC Sikkel --- Department of Biological Sciences and Environmental Sciences Program, USA NJ Smit --- Water Research Group, Unit for Environmental Sciences and Management, South AfricaJuveniles of the Cape white seabream Diplodus capensis were observed cleaning adult conspecifics in a large tidepool off Sodwana Bay, South Africa. Although nine other tropical fish species were present and interacted with a nearby pair of Labroides cleaner wrasses,... -
Metabolic activity throughout early development of dusky kob Argyrosomus japonicus (Sciaenidae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Edworthy --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa NC James --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa B Erasmus --- Department of Ichthyology and Fisheries Science, South Africa JOG Kemp --- Department of Ichthyology and Fisheries Science, South Africa H Kaiser --- Department of Ichthyology and Fisheries Science, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaThe physiology of fishes in the early stages of development remains poorly assessed despite the importance of identifying energy bottlenecks in organisms faced with changing environmental conditions. This study describes the metabolic activity of dusky kob Argyrosomus japonicus throughout its... -
Occurrence of oestrogenic pollutants and widespread feminisation of male tilapia in peri-urban dams in Bulawayo, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: C Teta --- Department of Environmental Science and Health, Zimbabwe; Current address: Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, South Africa BF Holbech --- Institute of Biology, University of Southern Denmark, Denmark L Norrgren --- Department of Pathology, Faculty of Veterinary Medicine, Sweden YS Naik --- Research and Innovation, ZimbabwePeri-urban water bodies are at risk from excessive pollution as they are direct sinks for urban effluents. The occurrence of oestrogenic and androgenic endocrine disrupting chemicals (EDCs) in effluents and water bodies around the city of Bulawayo, Zimbabwe, and their... -
Diet of bluegill Lepomis macrochirus in a South African reservoir during winter and summer
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PM Ndaleni --- Department of Ichthyology and Fisheries Science, South Africa RJ Wasserman --- South African Institute for Aquatic Biodiversity, South Africa BR Ellender --- South African Institute for Aquatic Biodiversity, South Africa OLF Weyl --- Department of Ichthyology and Fisheries Science, South AfricaAlien fishes are considered a major threat to aquatic biodiversity in South Africa, yet relatively little regional information on their biology and ecology is available for many of these species. Seasonal changes in the diet of the bluegill Lepomis macrochirus... -
Madagascar Fish Eagle productivity in the Tsimembo-Manambolomaty Protected Area and surrounding habitat of western Madagascar
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Gilbert Razafimanjato --- The Peregrine Fund Madagascar Project, Madagascar Lily-Arison René de Roland --- The Peregrine Fund Madagascar Project, Madagascar Marius Rakotondratsima --- The Peregrine Fund Madagascar Project, Madagascar Stephanie Razakaratrimo --- The Peregrine Fund Madagascar Project, Madagascar Yverlin ZM Pruvot --- The Peregrine Fund Madagascar Project, Madagascar Tsiresy M Razafimanantsoa --- Mention: Zoologie et Biodiversité Animale, Facultés des Sciences, Madagascar Aristide Andrianarimisa --- The Peregrine Fund Madagascar Project, Madagascar Russell Thorstrom --- The Peregrine Fund, USAWe monitored the productivity of the critically endangered Madagascar Fish Eagle Haliaeetus vociferoides inside and outside of the Tsimembo-Manambolomaty Protected Area (T-M PA), western Madagascar from 2010 to 2015. We recorded 14 breeding pairs inside and 13 outside T-M PA... -
How many can you catch? Factors influencing the occurrence of multi-prey loading in provisioning Greater Crested Terns
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Davide Gaglio --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Timothée R Cook --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Richard B Sherley --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Peter G Ryan --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South AfricaSeabirds use several methods to transport food to their chicks; most species carry food in their stomachs or crops, but some terns and auks carry prey in their bills. Terns usually only carry one prey item at a time, limiting... -
Acute toxicity effects of ibuprofen on behaviour and haematological parameters of African catfish Clarias gariepinus (Burchell, 1822)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EO Ogueji --- Department of Fisheries and Aquaculture, Nigeria CD Nwani --- Department of Zoology and Environmental Biology, Nigeria SC Iheanacho --- Department of Fisheries and Aquaculture, Nigeria CE Mbah --- Department of Zoology, Zaria CO Okeke --- Department of Biology/Microbiology/Biotechnology, Nigeria A Yaji --- Department of Fisheries, NigeriaIndiscriminate discharge of pharmaceutical waste into the aquatic ecosystem may pose serious health challenges to aquatic biota. The effect of acute exposure to ibuprofen was evaluated using changes in behaviour and haematological parameters under static bio-assay method in Clarias gariepinus... -
A multimetric-index approach using fisheries data to assess fish assemblage structure in relation to salinity gradient in a tropical West African estuary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Kantoussan --- Université Gaston Berger de Saint-Louis, Senegal JM Ecoutin --- Institut de Recherche pour le Développement (IRD), France R Laë --- Institut de Recherche pour le Développement (IRD), France OT Thiaw --- Institut Universitaire de Pêche et d’Aquaculture (IUPA), Université Cheikh Anta Diop de Dakar, Senegal L Tito de Morais --- Institut de Recherche pour le Développement (IRD), FranceThis study examines the effects of increasing salinity on fish assemblage structure in the Casamance Estuary, Senegal, using a series of indices. The study data were derived from commercial fishery surveys conducted between April and July 2005. Analysis of within-trophic-group... -
The age and growth of hottentot seabream Pachymetopon blochii before and after the South African linefish state of emergency in 2000
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MW Farthing --- Department of Ichthyology and Fisheries Science, South Africa AC Winkler --- Department of Ichthyology and Fisheries Science, South Africa K Anderson --- Department of Ichthyology and Fisheries Science, South Africa S Kerwath --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa C Wilke --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaThe hottentot seabream Pachymetopon blochii is a small-sized (maximum 2.67 kg) sparid endemic to southern Africa. It is an important target in South Africa's Western Cape traditional linefishery, particularly in the absence of more valuable pelagic species (such as Thyrsites... -
Population abundance and seasonal migration patterns indicated by commercial catch-per-unit-effort of hakes (Merluccius capensis and
M. paradoxus ) in the northern Benguela Current Large Marine Ecosystem Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JN Kathena --- National Marine Information and Research Centre (NatMIRC), Ministry of Fisheries and Marine Resources, Namibia D Yemane --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa N Bahamon --- Centre d’Estudis Avançats de Blanes (CEAB – CSIC), Spain T Jansen --- National Institute of Aquatic Resources (DTU Aqua), DenmarkWe developed generalised additive models (GAMs) to estimate standardised time-series of population abundance indices for assessment purposes and to infer ecological and behavioural information on northern Benguela hakes, Merluccius capensis and M. paradoxus, using haul-by-haul commercial trawl catch-rate data as... -
A mass mortality of fishes caused by receding water levels in the vegetated littoral zone of the West Kleinemonde Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AK Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaOn 15 November 2017 the mouth of the West Kleinemonde Estuary breached following heavy catchment rains and increased river flow. The water level in the estuary following mouth opening decreased by 1.65 m within 24 h, resulting in an almost... -
Health and chemical burdens of fish species from polluted and hyper-eutrophic freshwater ecosystems in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GM Wagenaar --- Department of Zoology, South Africa IEJ Barnhoorn --- Department of Zoology, South AfricaThree aquatic ecosystems in South Africa, the Hartbeespoort, Klipvoor and Bospoort Dams, are classified as hyper-eutrophic, because of high nutrient loads and chemical pollution. Water and two fish species, Clarias gariepinus and Cyprinus carpio, were collected from these dams to... -
Biomarkers of toxicity in Clarias gariepinus exposed to sublethal concentrations of polycyclic aromatic hydrocarbons
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TO Sogbanmu --- Ecotoxicology and Conservation Unit, Department of Zoology, Faculty of Science, Nigeria AO Osibona --- Department of Marine Sciences, Faculty of Science, Nigeria OA Oguntunde --- Department of Anatomic and Molecular Pathology, Faculty of Basic Medical Sciences, Nigeria AA Otitoloju --- Ecotoxicology and Conservation Unit, Department of Zoology, Faculty of Science, NigeriaPhysiological, biochemical and histological indices in Clarias gariepinus broodstock, and teratogenic indices in embryos exposed to sublethal concentrations of naphthalene, phenanthrene and pyrene were investigated in 2014 using a static-renewal bioassay protocol. Phenanthrene (1.41 mg l−1) was the most toxic,... -
Sources of fish in the ephemeral western iishana region of the Cuvelai–Etosha Basin in Angola and Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MHT Hipondoka --- Department of Geography, History and Environmental Studies, Namibia BCW van der Waal --- Department of Zoology, South Africa MH Ndeutapo --- Independent Researcher, Angola L Hango --- Ministry of Agriculture, Water and Forestry, Department of Water Affairs and Forestry, NamibiaThe triangle between the Kavango and Kunene rivers is drained by the Cuvelai, an ephemeral and deltaic drainage system covering more than 100 000 km2. In good rainfall years, the area becomes populated by fish communities dominated by five species... -
Preliminary evaluation of non-native rainbow trout (Oncorhynchus mykiss) impact on the Cederberg ghost frog (Heleophryne depressa) in South Africa’s Cape Fold Ecoregion
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Avidon --- Department of Conservation Ecology and Entomology, South Africa JM Shelton --- Department of Conservation Ecology and Entomology, South Africa SM Marr --- DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South Africa TA Bellingan --- Centre for Invasion Biology, South Africa KJ Esler --- Department of Conservation Ecology and Entomology, South Africa OLF Weyl --- DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South AfricaWe evaluated the impact of non-native rainbow trout Oncorhynchus mykiss on a population of endemic Cedarberg ghost frog Heleophryne depressa in the upper Krom River (Olifants-Doring River Catchment, Cape Fold Ecoregion). We compared H. depressa abundance (using kick-sampling and underwater... -
First report on OH-PAHs in South African Clarias gariepinus bile from an urban impacted system
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Pheiffer --- Water Research Group, Unit for Environmental Science and Management, South Africa N Bortey-Sam --- Laboratory of Toxicology, Department of Environmental Veterinary Science, Japan Y Ikenaka --- Water Research Group, Unit for Environmental Science and Management, South Africa SMM Nakayama --- Laboratory of Toxicology, Department of Environmental Veterinary Science, Japan H Mizukawa --- Department of Environmental Veterinary Science, Graduate School of Veterinary Medicine, Japan M Ishizuka --- Laboratory of Toxicology, Department of Environmental Veterinary Science, Japan NJ Smit --- Water Research Group, Unit for Environmental Science and Management, South Africa R Pieters --- Water Research Group, Unit for Environmental Science and Management, South AfricaThe concentrations of selected hydroxylated polycyclic aromatic hydrocarbons (OH-PAHs) were determined in the bile of the African sharptooth catfish Clarias gariepinus from impoundments in the urban impacted Klip River system in Soweto, South Africa. Fish were sampled from three impoundments... -
Evaluating the effects of catch-and-release angling on Cape stumpnose Rhabdosargus holubi in a South African estuary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NK Arkert --- Department of Ichthyology and Fisheries Science, South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa MC Parkinson --- Department of Ichthyology and Fisheries Science, South Africa AC Winkler --- Department of Ichthyology and Fisheries Science, South Africa E Butler --- Department of Ichthyology and Fisheries Science, South Africa S Mannheim --- Department of Ichthyology and Fisheries Science, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaFisheries managers are increasingly promoting catch-and-release (C&R) to manage recreationally angled fish stocks. Despite this, there is a scarcity of information on the effects of C&R on estuarine-dependent species. Cape stumpnose Rhabdosargus holubi dominates the recreational fisheries catch and provides... -
Quantifying the largest aggregation of giant trevally Caranx ignobilis (Carangidae) on record: implications for management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Daly --- Port Elizabeth Museum at Bayworld, South Africa CAK Daly --- Save Our Seas Foundation (SOSF) D’Arros Research Centre, Switzerland RH Bennett --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa MAM Pereira --- Centro Terra Viva, Mozambique JD Filmalter --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaThe giant trevally Caranx ignobilis (Forsskål) is an important apex predatory fish typically associated with coral reef communities. It is prized in recreational and commercial fisheries, yet little is known about its aggregation dynamics and susceptibility to fishing pressure. This... -
Macroparasites of angelfish Brama brama (Bonnaterre, 1788) in the southern Benguela Current ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AL Mackintosh --- Department of Biological Sciences, South Africa CC Reed --- Department of Biological Sciences, South Africa MAI Nunkoo --- Department of Biological Sciences, South Africa PH King --- Department of Biology, South Africa CD van der Lingen --- Department of Biological Sciences, South AfricaThe angelfish Brama brama is a mesopelagic species distributed circumglobally in temperate to warm-temperate waters, including continental-shelf-edge and upper-slope waters of the Benguela Current ecosystem. Little is known about the parasite assemblage of Benguela B. brama, with only three parasite... -
Effect of graded levels of dietary carbohydrate on growth, feed utilisation and intestinal microbial community structure in dusky kob Argyrosomus japonicus fed a pelleted diet
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NC Mabasa --- Department of Ichthyology and Fisheries Science, South Africa PJ Britz --- Department of Ichthyology and Fisheries Science, South Africa CLW Jones --- Department of Ichthyology and Fisheries Science, South Africa A Nel --- Department of Ichthyology and Fisheries Science, South AfricaThe ability to utilise carbohydrates is limited for many predatory marine fishes. Graded levels of dietary carbohydrate (4.1–24.6%) were formulated using pregelatinised maize starch, to determine optimal levels for dusky kob Argyrosomus japonicus, an emerging mariculture finfish for which pelleted... -
Assessment of the likely sensitivity to climate change for the key marine species in the southern Benguela system
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Ortega-Cisneros --- Department of Ichthyology and Fisheries Science, South Africa S Yokwana --- Department of Ichthyology and Fisheries Science, South Africa W Sauer --- Department of Ichthyology and Fisheries Science, South Africa K Cochrane --- Department of Ichthyology and Fisheries Science, South Africa A Cockcroft --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa NC James --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South Africa L Singh --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa M Smale --- Department of Zoology and Coastal and Marine Research, South Africa A Wood --- Gleneagles Environmental Consulting, South Africa G Pecl --- Institute for Marine and Antarctic Studies, AustraliaClimate change is altering many environmental parameters of coastal waters and open oceans, leading to substantial present-day and projected changes in the distribution, abundance and phenology of marine species. Attempts to assess how each species might respond to climate change... -
Data-moderate assessments of Cape monkfish Lophius vomerinus and west coast sole Austroglossus microlepis in Namibian waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JN Kathena --- National Marine Information and Research Centre (NatMIRC), Ministry of Fisheries and Marine Resources (MFMR), Namibia A Kokkalis --- National Institute of Aquatic Resources (DTU Aqua), Denmark MW Pedersen --- National Institute of Aquatic Resources (DTU Aqua), Denmark JE Beyer --- National Institute of Aquatic Resources (DTU Aqua), Denmark UH Thygesen --- National Institute of Aquatic Resources (DTU Aqua), DenmarkThere is global interest in providing scientific advice on optimal harvesting of all commercially exploited fish stocks. Nevertheless, many commercially important stocks lack analytical assessments. Therefore, we evaluate a data-moderate stock assessment method: the stochastic surplus production model in continuous... -
Socioeconomic dynamics of the Ghanaian tuna industry: a value-chain approach to understanding aspects of global fisheries
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Drury O’Neill --- Stockholm Resilience Centre, Sweden NK Asare --- Department of Fisheries and Aquatic Sciences, Ghana DW Aheto --- Department of Fisheries and Aquatic Sciences, GhanaThis study investigated how an industrial tuna fishery functions in terms of procedures, practices, governance and finance in the context of Ghana, West Africa. Tuna is Ghana’s biggest seafood export, contributing significantly to the domestic fisheries sector. A case-study approach... -
A new Dactylogyrus species (Dactylogyridae: Monogenea) from Enteromius mattozi, Cyprinidae, at Piet Gouws Dam, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: SN Mashego --- Biodiversity, School of Molecular and Life Science, South Africa KS Matlou --- Biodiversity, School of Molecular and Life Science, South AfricaEnteromius mattozi Guimaraes, 1884, a popular eating fish among local people, were examined for monogenean parasites as part of a larger study to ascertain the feasibility of establishing aquaculture production in Limpopo, South Africa. In this study a new monogenean... -
Oxidative stress responses of juvenile catfish, Clarias gariepinus exposed to potassium dichromate at sublethal concentrations in south-eastern Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FN Ekeh --- Department of Zoology and Environmental Biology, Nigeria EN Ekechukwu --- Department of Zoology and Environmental Biology, Nigeria CI Atama --- Department of Zoology and Environmental Biology, Nigeria FI Ezenwajiaku --- Department of Zoology and Environmental Biology, Nigeria CM Ohanu --- Department of Zoology and Environmental Biology, Nigeria JI Nzei --- Department of Zoology and Environmental Biology, Nigeria ION Aguzie --- Department of Zoology and Environmental Biology, Nigeria GE Odo --- Department of Zoology and Environmental Biology, Nigeria UME Dibuah --- Department of Microbiology, NigeriaThe oxidative stress responses of Clarias gariepinus exposed to potassium dichromate at sublethal concentrations for 28 days were studied in 2017. Fish were exposed to 0.165, 0.0825 and 0.033 mg l−1 corresponding to 1/10, 1/20 and 1/50 of the 96... -
The spatial ecology of adult Labeobarbus marequensis and their response to flow and habitat variability in the Crocodile River, Kruger National Park
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MJ Burnett --- Centre for Aquatic Research, Zoology Department, South Africa GC O’Brien --- School of Biology and Environmental Sciences, South Africa V Wepener --- Water Research Group, Unit for Environmental Sciences and Management, South Africa D Pienaar --- Scientific Services Skukuza, Kruger National Park, South AfricaThe spatial movement of Labeobarbus marequensis was evaluated by attaching radio transmitters to 16 adult fish and tracking them from August 2009 to July 2012 in the Crocodile River, Kruger National Park, South Africa. Monthly monitoring surveys acquired 1 620... -
Long-term physico-chemical and faunal changes in a small, rural South African estuary
Item type: Journal Article • Journal: African Zoology • Authors: M Kajee --- Department of Biological Sciences and Centre for Invasion Biology, South Africa CL Griffiths --- Department of Biological Sciences and Centre for Invasion Biology, South Africa SJ Lamberth --- Fisheries Management, Department of Agriculture, South AfricaThe Palmiet Estuary is a small, rural estuary in the Western Cape that only closes briefly during dry summers. The system was previously surveyed during 1979 to 1980 and we repeated the survey in April 2015 (mouth closed) and September... -
Fifty-five-year longevity for the largest member of the family Sparidae: the endemic red steenbras Petrus rupestris from South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AH Andrews --- , United States MJ Smale --- , South Africa PD Cowley --- , South Africa N Chang --- , South AfricaA previous study that explored the age and growth of red steenbras Petrus rupestris (Valenciennes, 1830), a large sparid (family Sparidae, seabreams or porgies) endemic to South Africa and reported to approach 2 m in length, provided estimates as a... -
Unique co-occurrence of two genera of cymothoid ectoparasitic isopods on the same individual fish host
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RL Welicky --- , South Africa NJ Smit --- , South AfricaParasitism of a host fish by a single species of cymothoid is regularly reported. For the first time on a temperate-fish host and in South African waters, we observed two species of cymothoids, the flesh-infesting Anilocra capensis and the tongue-infesting... -
Age, growth and natural mortality of blue jack mackerel Trachurus picturatus (Carangidae) from the Canary Islands, Spain (NW Africa)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Jurado-Ruzafa --- , Spain MTG Santamaría --- , SpainStatus assessment of exploited fish populations is a general requirement to ensure sustainability of fisheries in both global and local contexts. The blue jack mackerel Trachurus picturatus (Bowdich, 1825) remains unassessed in a data-limited fishery in the eastern central Atlantic,... -
Bathymetry, substrate and fishing areas of Southeast Atlantic high-seas seamounts
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: OA Bergstad --- Institute of Marine Research (IMR), Norway ÅS Høines --- Institute of Marine Research (IMR), Norway R Sarralde --- Instituto Espanol de Oceanografia, Centro Oceanografico de Canarias, Spain G Campanis --- South East Atlantic Fisheries Organisation (SEAFO), Namibia M Gil --- Departamento de Ecología y Biología Animal, Edificio de Ciencias Experimentales, Spain F Ramil --- Departamento de Ecología y Biología Animal, Edificio de Ciencias Experimentales, Spain E Maletzky --- Ministry of Fisheries and Marine Resources, Namibia E Mostarda --- Food and Agriculture Organization of the United Nations (FAO), Italy L Singh --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa MA António --- Secretary of State of Affairs, Ministry of Agriculture, Rural Development and Fisheries, AngolaMost of the Southeast Atlantic Ocean is abyssal, and global bathymetries suggest that only ∼3.2% of the areas beyond national jurisdiction (ABNJ; also known as the high seas, as defined in the United Nations Convention on the Law of the... -
Megabenthos and benthopelagic fishes on Southeast Atlantic seamounts
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: OA Bergstad --- Institute of Marine Research (IMR), Norway M Gil --- Departamento de Ecología y Biología Animal, Edificio de Ciencias Experimentales, Spain ÅS Høines --- Institute of Marine Research (IMR), Norway R Sarralde --- Instituto Espanol de Oceanografia, Centro Oceanografico de Canarias, Spain E Maletzky --- Ministry of Fisheries and Marine Resources, Namibia E Mostarda --- Food and Agriculture Organization of the United Nations (FAO), Italy L Singh --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa MA António --- Secretary of State of Affairs, Ministry of Agriculture, Rural Development and Fisheries, Angola F Ramil --- Departamento de Ecología y Biología Animal, Edificio de Ciencias Experimentales, Spain P Clerkin --- Pacific Shark Research Center (PSRC), Moss Landing Marine Laboratories, United States G Campanis --- South East Atlantic Fisheries Organisation (SEAFO) Secretariat, NamibiaIn a descriptive study of megafauna of several Southeast Atlantic seamounts, multiple video-transects on upper slopes and summits documented the occurrence of benthic invertebrate taxa, primarily corals, regarded as indicators of vulnerable marine ecosystems (VMEs) as defined in international guidelines... -
Movement patterns of an endemic South African sparid, the black musselcracker Cymatoceps nasutus, determined using mark-recapture methods
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TS Murray --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa BQ Mann --- Oceanographic Research Institute (ORI), South Africa JQ Maggs --- Oceanographic Research Institute (ORI), South Africa G Gouws --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaThis study made use of data from three long-term fish tagging projects along the South African coastline to investigate the movement behaviour of the endemic black musselcracker Cymatoceps nasutus (Sparidae). From 1984 to 2016, a total of 3 430 C... -
Ovarian activity and plasma sex steroid levels of Distichodus antonii in relation to environmental conditions in the upper basin of the Congo River
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JS Osombause --- Research Unit in Environmental and Evolutionary Biology, Belgium SNM Mandiki --- Research Unit in Environmental and Evolutionary Biology, Belgium JA-P Ulyel --- Département d’Hydrobiologie, Congo J-C Micha --- Research Unit in Environmental and Evolutionary Biology, Belgium P Kestemont --- Research Unit in Environmental and Evolutionary Biology, BelgiumDistichodus antonii is an endemic fish species of the Congo River basin in which the stocks of wild populations are threatened by overfishing pressure. Knowledge of its reproductive biology would be useful in consideration of conservation and management options for... -
Morphological and molecular characterization of Glossidium pedatum Looss, 1899 and Orientocreadium batrachoides Tubangui, 1931 from sharptooth catfish, Clarias gariepinus (Burchell, 1822)
Item type: Journal Article • Journal: African Zoology • Authors: José Chissiua Dumbo --- Department of Zoology, South Africa Quinton Marco Dos Santos --- Department of Zoology, South Africa Annemariè Avenant-Oldewage --- Department of Zoology, South AfricaThe superfamily Plagiorchioidea has a considerable number of genera and species with great uncertainty of their phylogenetic position. The objectives of the current study were to specifically describe the morphology and determine for the first time the phylogenetic position of... -
Bait collecting by subsistence and recreational fishers in Knysna Estuary may impact management and conservation
Item type: Journal Article • Journal: African Zoology • Authors: C Simon --- Department of Botany and Zoology, South Africa AN du Toit --- Department of Botany and Zoology, South Africa MKS Smith --- Rondevlei Scientific Services, South Africa L Claassens --- Knysna Basin Project, South Africa F Smith --- Knysna Basin Project, South Africa P Smith --- Knysna Basin Project, South AfricaTo facilitate development of tailored management strategies for bait species within Knysna Estuary (South Africa), demand for bait, harvesting activity and perceptions around conservation among recreational and subsistence bait fishers were investigated. In 2015 and 2016, bait collectors were interviewed... -
Reef fish and benthic community structures of the Santa Luzia Marine Reserve in the Cabo Verde islands, eastern central Atlantic Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Freitas --- Faculdade de Engenharia e Ciências do Mar, República de Cabo Verde TC Mendes --- Departamento de Ecologia, Brazil C Almeida --- Faculdade de Engenharia e Ciências do Mar, República de Cabo Verde T Melo --- Biosfera I – Associação para Defesa do Meio Ambiente, República de Cabo Verde RC Villaça --- Departamento de Biologia Marinha, Brazil R Noguchi --- Programa de Engenharia Ambiental, Brazil SR Floeter --- Laboratório de Biogeografia e Macroecologia Marinha, Departamento de Ecologia e Zoologia, Brazil CA Rangel --- Centro Nacional de Avaliação da Biodiversidade e de Pesquisa e Conservação do Cerrado (CBC), Brazil CEL Ferreira --- Departamento de Biologia Marinha, BrazilUnderstanding ecological structures and the dynamics of reef fish assemblages is a fundamental step in current conservation biology. Patterns of abundance and biomass of reef fish communities of the tropical Cabo Verde Archipelago (eastern central Atlantic Ocean) have not been... -
Spatial distribution, seasonal abundance and exploitation status of shark species in Kenyan coastal waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BK Kiilu --- Kenya Fisheries Services, Kenya B Kaunda-Arara --- Department of Fisheries and Aquatic Sciences, Kenya RM Oddenyo --- Coral Reef Conservation Project, Kenya P Thoya --- Kenya Marine and Fisheries Research Institute, Kenya JM Njiru --- Kenya Marine and Fisheries Research Institute, KenyaEfforts to conserve and manage shark populations are often hampered by a lack of basic data, such as species-specific landings and distribution ranges. We bridge this gap in coastal East Africa by providing data on the distributions, catch rates, morphometrics,... -
Histological alterations of selected tissues (gill, liver, kidney and stomach) in two common fish species within two eutrophic peri-urban lakes in Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: B Utete --- Department of Wildlife Ecology and Conservation, Zimbabwe N Mabika --- Department of Anatomy, Zimbabwe J Chiwara --- Department of Applied Biosciences and Biotechnology, Zimbabwe J Makaure --- Department of Applied Biosciences and Biotechnology, Zimbabwe C Phiri --- Department of Freshwater and Fishery Science, Zimbabwe SS Mlambo --- Department of Biotechnology Science, Zimbabwe N Muboko --- Department of Wildlife Ecology and Conservation, Zimbabwe J Tsamba --- Department of Biology, ZimbabwePollution threatens fish health in the eutrophic lakes, Chivero and Manyame, in Zimbabwe. Histopathological tissue alterations of two commonly consumed fish: catfish, Clarias gariepinus, and; tilapia, Oreochromis niloticus, from Lakes Chivero and Manyame were assessed between 2015 and 2016. Seventy-one... -
First record of Labeo capensis (Smith, 1841) in the Crocodile River (West) system: another successful non-native freshwater fish introduction in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JH Erasmus --- Water Research Group, Unit for Environmental Sciences and Management, South Africa W Malherbe --- Water Research Group, Unit for Environmental Sciences and Management, South Africa R Gerber --- Water Research Group, Unit for Environmental Sciences and Management, South Africa OLF Weyl --- DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South Africa B Sures --- Aquatic Ecology and Centre for Water and Environmental Research, Germany V Wepener --- Water Research Group, Unit for Environmental Sciences and Management, South Africa NJ Smit --- Water Research Group, Unit for Environmental Sciences and Management, South AfricaSouth Africa is one of six global fish invasion hotspots and as a result, non-native fishes are common components of the fish assemblages in all of the major river systems. The rate of establishment for introduced fish into South African... -
Growth and mortality parameters of the black-chinned tilapia Sarotherodon melanotheron melanotheron (Pisces: Cichlidae) in a small lagoon in the Central Region of Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GA Tibu --- Department of Fisheries and Aquatic Sciences, Ghana DW Aheto --- Department of Fisheries and Aquatic Sciences, Ghana J Blay --- Department of Fisheries and Aquatic Sciences, GhanaThis study quantified growth, mortality, and exploitation rate of the black-chinned tilapia (Sarotherodon melanotheron melanotheron) population in Etsir Lagoon, a small brackish waterbody at Abandze (5°11′ N, 1°5′ W) in the Central Region of Ghana for management of the stock... -
Accessing HIV treatment and care services in fishing communities around Lake Victoria in Uganda: mobility and transport challenges
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Christopher Tumwine --- Centre for Social Research in Health, Australia Peter Aggleton --- Centre for Social Research in Health, Australia Stephen Bell --- Kirby Institute for Infection and Immunity in Society, AustraliaQualitative research exploring the influence of community-level factors on access to and use of HIV treatment and care services among people living in fishing communities is limited, especially with respect to those already in receipt of HIV care and on... -
Can long-term content analysis of print media be used to examine species composition, population demography and changes in distributional range of recreational fishery species?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WM Potts --- Department of Ichthyology and Fisheries Science, South Africa T Jordan --- Department of Ichthyology and Fisheries Science, South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South AfricaAlthough marine recreational fisheries are socially and economically important, there is often limited funding for their monitoring and assessment. With South African anglers reporting catch declines for almost all targeted species and little long-term monitoring data available, novel methods need... -
Prevalence of Kudoa thyrsites (Myxozoa) in South African sardine Sardinops sagax, kingklip Genypterus capensis, and Cape hakes Merluccius capensis and M. paradoxus
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SS Henning --- Department of Food Science and Technology, South Africa M Krügel --- Department of Food Science, South Africa M Manley --- Department of Food Science, South AfricaPrevalence of infection with the myxozoan parasite Kudoa thyrsites is not well documented in sardine Sardinops sagax, the Cape hakes Merluccius capensis and M. paradoxus, and kingklip Genypterus capensis. Quantitative polymerase chain reaction assays were used to determine the prevalence... -
Smooth fan lobster Ibacus novemdentatus in the southwestern Indian Ocean: an overlooked fisheries resource?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Groeneveld --- Oceanographic Research Institute (ORI), South Africa LD Zacarias --- Instituto Nacional de Investigação Pesqueira (IIP), Mozambique SP Singh --- Oceanographic Research Institute (ORI), South AfricaBottom-trawl data collected by the RV Dr Fridtjof Nansen off Mozambique (in 1990, 2007 and 2018) and off eastern South Africa (in 2018) were analysed to investigate the distribution, abundance and size composition of the smooth fan lobster Ibacus novemdentatus... -
Patterns of juvenile reef-fish recruitment in Kenya’s shallow fringing- lagoon reefs
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GM Okemwa --- Kenya Marine and Fisheries Research Institute, Kenya B Kaunda-Arara --- Department of Fisheries and Aquatic Sciences, Kenya EN Kimani --- Kenya Marine and Fisheries Research Institute, KenyaStudies to understand local-scale patterns in the recruitment of juvenile coral-reef fishes within the western Indian Ocean (WIO) region are few, yet such knowledge is important in fisheries management. Underwater visual census surveys were conducted at five shallow fringing-lagoon reef... -
Age, growth and per-recruit stock assessment of southern mullet Chelon richardsonii in Saldanha Bay and Langebaan Lagoon, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Horton --- Department of Biological Sciences, South Africa D Parker --- Department of Biological Sciences, South Africa H Winker --- Branch: Fisheries Management, Department of Agriculture, South Africa SJ Lamberth --- Branch: Fisheries Management, Department of Agriculture, South Africa K Hutchings --- Anchor Environmental Consultants, South Africa SE Kerwath --- Department of Biological Sciences, South AfricaThe southern mullet Chelon richardsonii (Mugilidae) is the main target species of the inshore net fishery (gillnet and beach-seine) on the west coast of South Africa. The stock has displayed symptoms of overfishing, with a 28% reduction in the standardised... -
Diet of catfish Clarias buthupogon Sauvage, 1879 (Clariidae) in two rivers in the Yoko Reserve, Tshopo Province, Democratic Republic of the Congo
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RB Mahamba --- Department of Phytotechnics, Democratic Republic of the Congo JN Ndjaki --- Department of Hydrobiology, Democratic Republic of the Congo AB Kankonda --- Department of Hydrobiology, Democratic Republic of the Congo J-C Micha --- Environmental Biology Research Unit (URBE), BelgiumThe diet of the catfish, Clarias buthupogon, was studied in two forest rivers in the Yoko Reserve, the Yoko and Biaro Rivers, from September 2008 to August 2009. Gill nets, long lines and traditional traps were used to catch the... -
Catch distribution and size structure of Nile tilapia (Oreochromis niloticus) in Lake Tana, Ethiopia: implications for fisheries management
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DA Tefera --- Bahir Dar University College of Agriculture and Environmental Sciences, Ethiopia MM Zerihun --- Fisheries, Wetlands and Wildlife Management, Ethiopia YTG Wolde-Meskel --- Hawassa University College of Agriculture, EthiopiaNile tilapia (Oreochromis niloticus) is the most important species for consumption and economic purposes in Lake Tana, yet, tilapia stocks have declined drastically over the past decades because of anthropogenic impacts. Thus, effective conservation management is required urgently. The aim... -
Diet of Glossogobius callidus (Teleostei: Gobiidae) in freshwater impoundments in the Sundays River Valley of the Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Mofu --- Department of Ichthyology and Fisheries Science, South Africa DJ Woodford --- Centre for Invasion Biology, School of Animal, Plant and Environmental Sciences, South Africa RJ Wasserman --- South African Institute for Aquatic Biodiversity, South Africa T Dalu --- South African Institute for Aquatic Biodiversity, South Africa OLF Weyl --- Department of Ichthyology and Fisheries Science, South AfricaDespite the high abundance of the gobiid fish Glossogobius callidus in many freshwater ecosystems in South Africa, very few studies have assessed the biology and ecology of the species. Here, we investigated the diet of G. callidus populations sourced from... -
The purse-seine fishery for small pelagic fishes off the Madeira Archipelago
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Tejerina --- Observatório Oceânico da Madeira, Agência Regional para o Desenvolvimento da Investigação, Tecnologia e Inovação (OOM/ARDITI) [Oceanic Observatory of Madeira/Regional Agency for the Development of Research, Technology and Innovation], Portugal M Hermida --- Observatório Oceânico da Madeira, Agência Regional para o Desenvolvimento da Investigação, Tecnologia e Inovação (OOM/ARDITI) [Oceanic Observatory of Madeira/Regional Agency for the Development of Research, Technology and Innovation], Portugal G Faria --- Research Service, Direção Regional de Pescas (DRP) [Regional Directorate of Fisheries], Portugal J Delgado --- Research Service, Direção Regional de Pescas (DRP) [Regional Directorate of Fisheries], PortugalSmall pelagic fishes constitute a valuable food resource for human consumption and are also important components of marine food webs. At Madeira, a Portuguese archipelago in the eastern Atlantic, they are the target of a year-round purse-seine fishery operating mainly... -
Population structure and growth of the beaked clam Eumarcia paupercula (Bivalvia, Veneridae) in Maputo Bay, Mozambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ED Mugabe --- Centre of Coastal Studies and School of Marine and Coastal Sciences, Mozambique CA Amoda --- Centre of Coastal Studies and School of Marine and Coastal Sciences, Mozambique CL Griffiths --- Marine Research Institute and Department of Biological Sciences, South AfricaThe edible beaked clam Eumarcia paupercula (Holten, 1802) is an abundant component of the intertidal infauna in Maputo Bay, Mozambique, and is an important source of food and income for local communities. This study investigates the population structure and estimates... -
A snapshot assessment of the diet of Cape fur seals Arctocephalus pusillus pusillus at Ilha dos Tigres, Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Winkler --- Department of Ichthyology and Fisheries Science, South Africa S Mannheim --- Department of Ichthyology and Fisheries Science, South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa C Santos --- Biologia Faculdade de Ciências, Angola C de Beer --- Department of Ichthyology and Fisheries Science, South Africa MJ Smale --- Department of Zoology and Institute for Coastal and Marine Research, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaThe population of Cape fur seal Arctocephalus pusillus pusillus at Ilha dos Tigres off the coast of southern Angola is expanding. Until now the only available biological information on the population has been its demographic parameters, and this insufficiency has... -
A tale of two habitats: preliminary comparison of fish abundance and diversity between saltmarsh- and mangrove-dominated creeks in the Nahoon Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Keur --- Department of Biodiversity and Conservation Biology, Faculty of Natural Science, South Africa N James --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa A Rajkaran --- Department of Biodiversity and Conservation Biology, Faculty of Natural Science, South AfricaA preliminary assessment of abundance and richness of fishes utilising saltmarsh and mangrove habitats in the Nahoon Estuary, situated on the eastern coast of South Africa, was undertaken during July 2017. The structural composition and complexity of the two habitats... -
Life history, distribution and seasonal movements of a threatened South African endemic seabream, Chrysoblephus gibbiceps
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CG Attwood --- Department of Biological Sciences and the Marine Research Institute, South Africa ME Dawson --- Department of Biological Sciences and the Marine Research Institute, South Africa SE Kerwath --- Department of Biological Sciences and the Marine Research Institute, South Africa C Wilke --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South AfricaThe red stumpnose Chrysoblephus gibbiceps (Sparidae) is a South African endemic seabream that has been severely depleted by fishing. A total of 678 C. gibbiceps were sampled by line and trawl fishing for a study of their morphology, age, growth,... -
Oxygen and temperature influence the distribution of deepwater Cape hake Merluccius paradoxus in the southern Benguela: a GAM analysis of a 10-year time-series
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: FL Mbatha --- Department of Biological Sciences and Marine Research Institute, South Africa D Yemane --- Department of Biological Sciences and Marine Research Institute, South Africa M Ostrowski --- Institute of Marine Research (IMR), Norway CL Moloney --- Department of Biological Sciences and Marine Research Institute, South Africa MR Lipiński --- Department of Ichthyology and Fisheries Science, South AfricaGeneralised additive models (GAMs) were applied to survey data to assess the influence of dissolved oxygen, water temperature and year of sampling upon the presence/absence of small (≤15 cm TL), medium (16–34 cm TL) and large (≥35 cm TL) size... -
Restoration of Lake St Lucia, the largest estuary in South Africa: historical perceptions, exploitation, management and recent policies
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NT Forbes --- Marine and Estuarine Research, Hyper-by-the-Sea, South Africa AT Forbes --- Marine and Estuarine Research, Hyper-by-the-Sea, South Africa B James --- iSimangaliso Wetland Park Authority, Dredger Harbour, South AfricaRestoration of estuarine function to the Lake St Lucia system, the largest estuary in South Africa, was initiated in 2010. Significant change began with the reversal of a mouth management policy that was adopted in 1952 and maintained for the... -
Review of fish life history strategies associated with warm temperate South African estuaries and a call for effective integrated management
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NA Strydom --- Department of Zoology, South Africa Y Kisten --- Department of Zoology, South AfricaRefuge and feeding areas for young fish in estuaries are important for the survival of fish and replenishment of coastal fish stocks, particularly in the temperate south east coast of southern Africa. Larvae and juveniles of important fishery species recruit... -
High flow variability and storm events shape the ecology of the Mbhashe Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NC James --- South African Institute for Aquatic Biodiversity, South Africa JB Adams --- Institute for Coastal and Marine Research, South Africa AD Connell --- South African Institute for Aquatic Biodiversity, South Africa SJ Lamberth --- South African Institute for Aquatic Biodiversity, South Africa CF MacKay --- Oceanographic Research Institute, South Africa GC Snow --- Institute for Coastal and Marine Research, South Africa L van Niekerk --- Institute for Coastal and Marine Research, South Africa AK Whitfield --- South African Institute for Aquatic Biodiversity, South AfricaThe possible impacts of extreme events on the ecology of selected aquatic biota within the Mbhashe Estuary were investigated during a four year (2010–2013) spring sampling programme. During periods of low to average flow conditions the estuary is shallow, turbid... -
Using stable δ13C and δ15N isotopes to assess foodweb structures in an African subtropical temporary pool
Item type: Journal Article • Journal: African Zoology • Authors: L de Necker --- Water Research Group, Unit for Environmental Sciences and Management, South Africa A Manfrin --- Environmental Campus Birkenfeld, Germany Y Ikenaka --- Water Research Group, Unit for Environmental Sciences and Management, South Africa M Ishizuka --- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Japan L Brendonck --- Water Research Group, Unit for Environmental Sciences and Management, South Africa JHJ van Vuren --- Water Research Group, Unit for Environmental Sciences and Management, South Africa B Sures --- Department of Aquatic Ecology and Centre for Water and Environmental Research (ZWU), Germany V Wepener --- Water Research Group, Unit for Environmental Sciences and Management, South Africa NJ Smit --- Water Research Group, Unit for Environmental Sciences and Management, South AfricaSouthern Africa has one of the highest densities of temporary pools and some of the most understudied temporary wetlands in the world. Additionally, the eastern African annual killifishes (Nothobranchius spp.) are rare in southern Africa and found exclusively in temporary... -
Spatial patterns and environmental risks of ringnet fishing along the Kenyan coast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P Thoya --- Kenya Marine and Fisheries Research Institute, Kenya S Pérez-Jorge --- Marine and Environmental Sciences Centre (MARE) and Institute of Marine Research (IMAR), Portugal GM Okemwa --- Kenya Marine and Fisheries Research Institute, Kenya H Mwamlavya --- Kenya Marine and Fisheries Research Institute, Kenya A Tuda --- Kenya Wildlife Service, Kenya N Wambiji --- Kenya Marine and Fisheries Research Institute, Kenya JM Maina --- Department of Environmental Sciences, AustraliaRingnet fishing began in the early 20th century and is practised worldwide, mainly to target nearshore pelagic species. The method was introduced to Kenya’s coastal waters by migrant fishers from Tanzania. However, the impacts of this fishing gear remain poorly... -
Reproductive biology of the mackerel scad Decapterus macarellus from Cabo Verde and the implications for its fishery management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MPV Costa --- Instituto Nacional do Desenvolvimento das Pescas [National Institute for Fisheries Development ] (INDP), Cabo Verde DRS Cruz --- Faculty of Sciences of the University of Lisbon, Portugal LS Monteiro --- Federal University of Rio Grande, Brazil KSM Evora --- University of Cabo Verde, Cabo Verde LG Cardoso --- Federal University of Rio Grande, BrazilThe mackerel scad Decapterus macarellus is of great social and economic importance to Cabo Verde citizens; however, in recent years catches have shown an unexplained decline. The harvest is regulated by way of a minimum legal size and a seasonal... -
Contrasting patterns in the abundance of fish communities targeted by fishers on two coral reefs in southern Mozambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Sancelme --- Australian Institute of Marine Science, Indian Ocean Marine Research Centre, Australia J Goetze --- Global FinPrint Project, Australia S Jaquemet --- Université de La Réunion, UMR 9220 ENTROPIE [Tropical Marine Ecology Laboratory], Réunion MG Meekan --- Australian Institute of Marine Science, Indian Ocean Marine Research Centre, Australia A Flam --- Marine Megafauna Foundation, Marine Megafauna Research Center, Mozambique AM Watts --- Marine Megafauna Foundation, Marine Megafauna Research Center, Mozambique CW Speed --- Australian Institute of Marine Science, Indian Ocean Marine Research Centre, AustraliaCoastal populations of maritime countries in eastern Africa rely on fish as a primary source of protein, but baseline information on the abundance of fish communities on these coastlines is often lacking. We used baited remote underwater video stations to... -
Histopathology of the liver and gills of Labeo rosae (rednose Labeo) from Loskop Dam in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Jeffrey Lebepe --- , South Africa Johan Steyl --- , South Africa Wilmien J Luus-Powell --- , South AfricaThe Loskop Dam is the most polluted impoundment in the Olifants River, because it receives pollutants from the entire mine-dominated upper catchment. However, histopathology of fish inhabiting this polluted dam is scantly explored. The current study aimed to investigate the... -
The diet of spotted-necked otters foraging in trout-stocked waters in Mpumalanga, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Rowan K Jordaan --- , South Africa Michael J Somers --- , South Africa Grant Hall --- , South Africa Trevor McIntyre --- , South AfricaHuman-wildlife conflict is likely to increase as urbanisation increases. African clawless otters, Aonyx capensis, and spotted-necked otters, Hydrictis maculicollis, are illegally persecuted for their perceived role in reducing trout in artificially stocked habitats in South Africa. The diet of African... -
Monitoring the effects of spatial protection on the reef fish communities of the Pondoland Marine Protected Area, Eastern Cape Province, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- , South Africa JQ Maggs --- , New Zealand SN Porter --- , South Africa WN Dalton --- , South AfricaMonitoring marine protected areas (MPAs) is critical for evaluating their effectiveness and for improving management. In this study, a single-camera baited remote underwater video system (mono-BRUVS) was deployed quarterly at four sites (10–30-m depths) to quantify the reef fish communities... -
Using action cameras to estimate the abundance and habitat use of threatened fish in clear headwater streams
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: B Hannweg --- , South Africa SM Marr --- , South Africa LE Bloy --- , South Africa OLF Weyl --- , South AfricaSnorkel and electrofishing surveys are the traditional baseline methods for fish surveys in clear headwater streams. However, action cameras provide a non-harmful alternative to monitor freshwater fish populations to develop informed conservation management initiatives. In this paper, estimates from photographs... -
Relative growth of invasive and indigenous tilapiine cichlid fish in Tanzania
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SJ Bradbeer --- , United Kingdom BP Ngatunga --- , Tanzania GF Turner --- , United Kingdom MJ Genner --- , United KingdomNon-native species have been widely distributed across Africa for the enhancement of capture fisheries, but it can be unclear what benefits in terms of fisheries production the non-native species bring, compared with native species. Here we compared the relative growth... -
The effect of cadmium toxicity on Oreochromis niloticus and human health
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: K Abougabal --- , Egypt WA Moselhy --- , Egypt FMM Korni --- , EgyptCadmium levels below permissible limits can be toxic, affecting the health of exposed aquatic organisms and ultimately human health. Although cause and effect links between aquatic organisms and human health have not been elicidated, this study evaluated the effect of... -
Habitat utilisation of Pseudobarbus afer and Sandelia capensis in headwaters of the Swartkops River, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: B Hannweg --- , South Africa SM Marr --- , South Africa LE Bloy --- , South Africa OLF Weyl --- , South AfricaHabitat degradation is one of the greatest threats to endemic freshwater fish in the Cape Fold Ecoregion. One habitat restoration strategy is the replication of critical habitat using artificial materials. In this paper, we evaluate the habitat occupancy of two... -
Beta diversity of pelagic assemblages at fish aggregating devices in the open ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: F Forget --- , France L Dagorn --- , France B Mérigot --- , France JC Gaertner --- , French Polynesia J Robinson --- , Seychelles PD Cowley --- , South Africa MS Adam --- , Maldives Y Rilwan --- , Maldives M Koonjul --- , Mauritius V Mangar --- , Mauritius M Taquet --- , French Polynesia F Ménard --- , FranceOwing to difficulties in accessing the vast open ocean, the beta (β) diversity of pelagic fish assemblages remains poorly studied. We investigated the relationship between assemblage similarity and geographical distance between anchored fish aggregating devices (FADs), sampled by standardised underwater... -
Utilization of collapsible fish tank innovation among homestead fish farmers in Osun State, Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Idris Olabode Badiru --- , Nigeria Theophilus Opeyemi Amure --- , NigeriaThis study ascertained the utilization of collapsible fish tanks among homestead fish farmers in Osun State of Nigeria. A structured questionnaire was used to elicit data on fish farmers’ awareness, disposition, influencing/limiting factors and utilization of the fish tank innovation... -
Cadmium and lead levels in three freshwater fish species from the Zambezi region, Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: O Madzingira --- , Namibia LZ Lifumbela --- , Namibia E Kandiwa --- , Namibia L Kandjengo --- , Namibia B Mushonga --- , NamibiaMuscle tissue from three-spotted tilapia (Oreochromis andersonii) (n = 11), sharp tooth catfish (Clarias gariepinus) (n = 14) and tigerfish (Hydrocynus vittatus) (n = 12) were sampled from a market in the Zambezi region, Namibia in June 2018 and analysed... -
Age and growth of Nile tilapia Oreochromis niloticus (Linnaeus, 1758) from Lake Tana, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Degsera --- , Ethiopia M Minwyelet --- , Ethiopia T Yosef --- , EthiopiaAge and growth of Nile tilapia, Oreochromis niloticus, from Lake Tana were studied from June 2016 to May 2017. In total, 1 597 otoliths were collected from three representative sampling sites for macrozone analysis. Otoliths were ground and examined under... -
Host selection and notes on the distribution of Chonopeltis australis Boxshall, 1976 in southern Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LAM Neethling --- , South Africa A Avenant-Oldewage --- , South AfricaThe parasite Chonopeltis australis Boxshall, 1976 has been recorded from tributaries of the Orange-Vaal River System. It is host-specific, preferring the cyprinids Labeo capensis (Smith, 1841) and Labeo umbratus (Smith, 1841). Sampling was conducted between spring 2016 and autumn 2019... -
Trends in shore-based angling effort determined from aerial surveys: a case study from KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- , South Africa JB Mann-Lang --- , South AfricaUnderstanding the spatiotemporal characteristics of effort is a critical component of managing fisheries. Recreational shore-angling is the largest sector of the linefishery and one of the primary recreational activities undertaken along the coast of KwaZulu-Natal (KZN), South Africa. The aim... -
Time-course of the physiological-stress response in bronze bream Pachymetopon grande following a simulated catch-and-release angling event
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BA Pringle --- , South Africa A-R Childs --- , South Africa EC Butler --- , South Africa AC Winkler --- , South Africa MI Duncan --- , South Africa C Teta --- , South Africa WM Potts --- , South AfricaCatch-and-release (C&R) angling has increased in popularity through its mandatory and voluntary use in fisheries conservation and management. However, research has shown that fish can experience considerable stress during a C&R event. The physiological response of fishes is typically assessed... -
Accounting for linefish dependency in management of the South African small pelagic fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Parker --- , South Africa JC Coetzee --- , South Africa H Winker --- , South Africa CD van der Lingen --- , South AfricaTo further implement an ecosystem approach to management of the small pelagic fishery in South Africa, we attempted to develop functional relationships between spatialised time-series of the biomass of three small pelagic fish species and the catch per unit effort... -
High genetic diversity and limited spatial structure in an endangered, endemic South African sparid, the red steenbras Petrus rupestris
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: G Gouws --- , South Africa SE Kerwath --- , South Africa WM Potts --- , South Africa NC James --- , South Africa NG Vine --- , South Africa PD Cowley --- , South AfricaThe red steenbras Petrus rupestris is endemic to South Africa, occurring from False Bay in the Western Cape Province to St Lucia in the province of KwaZulu-Natal. This species, the largest member of the family Sparidae, has undergone a substantial... -
Quantifying the impacts of abrasion and bacterial transfer when fish are exposed to sand during a catch-and-release event
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RM Foster --- , South Africa A-R Childs --- , South Africa M Brooks --- , South Africa MW Farthing --- , South Africa EC Butler --- , South Africa WM Potts --- , South AfricaBest-practice guidelines to improve recreational fishers’ handling during catch-and-release (C&R) events are critical to improve the conservation and management of fish stocks worldwide. While best-practice research is growing, there are knowledge gaps, with the effects of sand exposure on fish... -
Physiological stress response and recovery of an important estuarine fishery species, dusky kob Argyrosomus japonicus, after a simulated catch-and-release event
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NK Arkert --- , South Africa A-R Childs --- , South Africa MI Duncan --- , South Africa M Farthing --- , South Africa WM Potts --- , South AfricaCatch and release (C&R) angling is a popular pastime the world over; however, studies have found that fish can experience considerable stress during a C&R event. To determine the effect of a C&R event on angled fishes, the physiological stress... -
Are South African linefishes recovering and what makes them prone to overexploitation?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Haupt --- , South Africa H Winker --- , South Africa D Parker --- , South Africa SE Kerwath --- , South AfricaManaging coastal fisheries is challenging as the status of many fish stocks caught in these fisheries remains unknown. In the South African linefishery, regular comprehensive assessments of the status of most linefish stocks are unattainable owing to a scarcity of... -
Editorial overview: recommendations for the promotion of a resilient linefishery in the Anthropocene
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WM Potts --- , South Africa CG Attwood --- , South Africa PD Cowley --- , South Africa A-R Childs --- , South Africa AC Winkler --- , South Africa MI Duncan --- , South Africa TS Murray --- , South Africa BQ Mann --- , South Africa JB Mann-Lang --- , South Africa‘Linefish’ is a uniquely South African term used to describe marine fishes that are captured using hook and line. The South African linefishery is a complex socio-ecological system that has a considerable impact on the coastal marine environment while generating... -
A Cowrie’s Life: The São Bento and Transoceanic Trade in the Sixteenth Century
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Justine Wintjes --- , South AfricaA collection of money cowries (Monetaria moneta) was discovered in the early 1980s inside a bronze cannon salvaged from the wreck site of the São Bento (1554), at the mouth of the Mzikaba River, Eastern Cape, South Africa. Using an... -
Spatial and ontogenetic variability in the diet and trophic ecology of two co-occurring catsharks (Scyliorhinidae) off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GM van der Heever --- , South Africa CD van der Lingen --- , South Africa RW Leslie --- , South Africa MJ Gibbons --- , South AfricaThe Izak catshark Holohalaelurus regani and the yellow-spotted catshark Scyliorhinus capensis both occur over the continental shelf around South Africa and are often caught together as bycatch in demersal trawls. Yet our understanding of their diet is fragmented, which makes... -
Application of a general methodology to understand vulnerability and adaptability of the fisheries for small pelagic species in the Benguela countries: Angola, Namibia and South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KL Cochrane --- , South Africa K Ortega-Cisneros --- , South Africa JA Iitembu --- , Namibia CI dos Santos --- , Angola WHH Sauer --- , South AfricaThe fisheries for small pelagic species in Angola, Namibia and South Africa fulfil important social and economic roles but have undergone substantial changes in recent years, some of which are likely to be related to climate change. This assessment of... -
Size at maturity, maturity stages and sex ratio of tigerfish Hydrocynus vittatus Castelnau, 1861 in Lake Kariba, Zimbabwe: assessing the influence of decades of fisheries exploitation
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Terence Magqina --- , Zimbabwe Tatenda Dalu --- , South Africa Lindah Mhlanga --- , Zimbabwe Tamuka Nhiwatiwa --- , ZimbabweSize at maturity, sex ratio and maturity stages are key population parameters in fisheries management of exploited stocks because they influence survival of fish populations. The decline in Hydrocynus vittatus catches during the tigerfish competition and along the shoreline of... -
Links between introduced fish and zooplanktonic and zoobenthic food sources in the food webs of two reservoirs of a semi-arid zone in Algeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Djezzar --- , Algeria JM Mortillaro --- , Madagascar SE Doumandji --- , Algeria T Meziane --- , FranceFew studies have focused on the trophic functioning of the reservoirs in Algeria. The study of the gut contents of fish species, as well as the analysis of the stable isotopes of 13C and 15N in the environment, were carried... -
Ten research questions to support South Africa’s Inland Fisheries Policy
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OLF Weyl --- , South Africa L Barkhuizen --- , South Africa K Christison --- , South Africa T Dalu --- , South Africa HA Hlungwani --- , South Africa D Impson --- , South Africa K Sankar --- , South Africa NE Mandrak --- , Canada SM Marr --- , South Africa JR Sara --- , South Africa NJ Smit --- , South Africa D Tweddle --- , South Africa NG Vine --- , South Africa V Wepener --- , South Africa M Zvavahera --- , South Africa IG Cowx --- , United KingdomSouth Africa is in the process of developing a National Freshwater (Inland) Wild Capture Fisheries Policy. A properly focused research strategy is essential to guide the policy development process, and thus a dedicated ‘Inland Fisheries’ workshop was convened by the... -
Stock separation of the shallow-water hake Merluccius capensis in the Benguela ecosystem using otolith shape analysis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ENG Shoopala --- , Namibia MR Wilhelm --- , Namibia SC Paulus --- , NamibiaThe fishing industry is an important economic sector in Namibia and South Africa, with the shallow-water hake Merluccius capensis being an important target species. Recent genetic studies of M. capensis found two stocks in the Benguela Current Large Marine Ecosystem,... -
Evaluating Kenya’s coastal gillnet fishery: trade-offs in recommended mesh-size regulations
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Osuka --- , Kenya JA Kawaka --- , Kenya MA Samoilys --- , KenyaGillnets are a widely used fishing gear in Kenya’s artisanal fisheries, yet their mesh sizes are inadequately monitored or regulated. This study evaluated the impacts of gillnets of seven stretched-mesh sizes, through comparative analysis of species-related metrics and catch per... -
Demersal fish communities in KwaZulu-Natal, South Africa, indicate partial congruence with proposed conservation biozones
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WN Dalton --- , South Africa SN Porter --- , South Africa T-C Livingstone --- , South Africa BQ Mann --- , South AfricaThe KwaZulu-Natal shelf, on the east coast of South Africa, is inhabited by diverse communities of demersal fishes; however, previous studies deeper than 30 m have largely investigated these with extractive techniques. Using baited remote underwater videos (BRUVs), this study... -
Cross-shelf movement of Chrysaora fulgida (Scyphozoa; Discomedusae) off Namibia inferred from stable isotopes (δ15N and δ13C)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: H Skrypzeck --- , South Africa CD van der Lingen --- , South Africa MJ Gibbons --- , South AfricaLarge and small specimens of two species of metagenic Scyphozoa (true jellyfishes) can be found in nearshore waters off central Namibia throughout the year. Whereas populations of Chrysaora africana are largely restricted to inshore waters, C. fulgida occurs across the... -
Can bait improve the efficiency of underwater video monitoring of fish in headwater streams? A case study from the Rondegat River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SZ Bajaba --- , South Africa S Hugo --- , South Africa AJ van Wyk --- , South Africa SM Marr --- , South Africa NG Vine --- , South Africa OLF Weyl --- , South AfricaThe use of action cameras for underwater video sampling provides a non-harmful alternative for monitoring endangered and threatened fish populations in clear headwater streams. Here, we examine the use of baited remote underwater video systems (BRUVS) for the monitoring of... -
Long-term variation in the breeding diets of macaroni and eastern rockhopper penguins at Marion Island (1994–2018)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: FE Dakwa --- , South Africa PG Ryan --- , South Africa BM Dyer --- , South Africa RJM Crawford --- , South Africa PA Pistorius --- , South Africa AB Makhado --- , South AfricaPopulations of the macaroni penguin Eudyptes chrysolophus and the eastern rockhopper penguin E. filholi breeding at Marion Island (Prince Edward Islands) in the sub-Antarctic Indian Ocean decreased from 1994 to 2018. We examined their diets when rearing chicks during this... -
Movement patterns and growth rate of the whitespotted wedgefish Rhynchobatus djiddensis in southern Africa based on tag-recapture data
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GL Jordaan --- , South Africa BQ Mann --- , South Africa R Daly --- , South Africa SW Dunlop --- , South Africa PD Cowley --- , South AfricaInformation on the movement ecology of endangered species is critical for the implementation of effective conservation measures. This study made use of a long-term dart tagging dataset to reveal the movement patterns and growth rates of two size classes of... -
When cooling is worse than warming: investigations into the thermal tolerance of an endemic reef fish, Boopsoidea inornata
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Allison --- , South Africa C Muller --- , South Africa A-R Childs --- , South Africa W Froneman --- , South Africa LA Bailey --- , South Africa WM Potts --- , South AfricaRecent investigations suggest that global warming is likely to alter temperature regimes along the southeastern coastline of South Africa through the increased frequency of upwelling events. Identifying thermal thresholds is fundamental in predicting the response of marine ectotherms to rapidly... -
A decade of surf-zone linefish monitoring in the Dwesa-Cwebe Marine Protected Area, with a preliminary assessment of the effects of rezoning and resource use
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Bullock --- , South Africa A Wood --- , South Africa VA Dames --- , South Africa JA Venter --- , South Africa J Greeff --- , South AfricaAn 11-year assessment of surf-zone linefish (marine fish captured on hook and line) was carried out in the Dwesa-Cwebe Marine Protected Area (MPA) in the Eastern Cape, South Africa, by research fishing to determine species and size composition, movement and... -
Day/night patterns of habitat use by dogfish sharks (Squalidae) at photic and subphotic warm-temperate reefs: evidence for diel movements and size- and sex-segregation
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Juby --- , South Africa ATF Bernard --- , South Africa A Götz --- , South AfricaDogfish sharks (genus Squalus) demonstrate complex distribution patterns that may increase their vulnerability to selective overfishing. This study investigated the day/night reef-use patterns in a population of dogfish (presumably Squalus acutipinnis) on shallow photic (13–35 m) and deep subphotic (51–99... -
Evaluating the evidence for ecological effectiveness of South Africa’s marine protected areas
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SP Kirkman --- , South Africa BQ Mann --- , South Africa KJ Sink --- , South Africa R Adams --- , South Africa T-C Livingstone --- , South Africa JB Mann-Lang --- , South Africa MC Pfaff --- , South Africa T Samaai --- , South Africa MG van der Bank --- , South Africa L Williams --- , South Africa GM Branch --- , South AfricaWe reviewed 140 papers to assess the ecological effectiveness of South Africa’s marine protected areas (MPAs). Evidence was assessed for coverage and representivity, protection of important biodiversity areas, other recognised elements of effectiveness, connectivity, and ecological effects—from the scale of... -
Occurrence of echinostomatoids (Platyhelminthes: Digenea) in Great Cormorant (Phalacrocorax carbo) and Grey Heron (Ardea cinerea): first insights into the DNA barcodes from Lake Victoria, Tanzania
Item type: Journal Article • Journal: African Zoology • Authors: Fred Chibwana --- , Tanzania Jestina Katandukila --- , TanzaniaMost migratory aquatic birds are regarded as reservoir hosts for many parasitic diseases, including digenetic trematodes that cause significant losses to farmed fish. However, in Tanzania, studies of birds focus more on their species diversity and patterns of speciation than... -
A review of the populations of tilapiine species in lakes Victoria and Naivasha, East Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Edwine Yongo --- , Kenya Laurent Cishahayo --- , Peoples Republic of China Eunice Mutethya --- , Kenya Bonface Mnang’at Alkamoi --- , Kenya Kokwon Costa --- , Kenya Nzeyimana Jean Bosco --- , Peoples Republic of ChinaThis paper discusses the catch trends, population attributes and biological characteristics of tilapiine species that are both native and that have been introduced into Lake Victoria and Lake Naivasha. Predation by Lates niloticus, species hybridisation, overfishing, pollution and eutrophication have... -
Dazzled by the light: the impact of light pollution from ships on seabirds at Tristan da Cunha
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Peter G Ryan --- , South Africa E Molly Ryan --- , South Africa James P Glass --- ,Most of the millions of burrow-nesting petrels that breed at Tristan da Cunha are susceptible to light pollution. On dark, misty nights, petrels become disoriented by artificial lights, mainly from ships. From 2013 to 2021 at least 1 823 petrels... -
Stock assessment of Nile tilapia Oreochromis niloticus (Linnaeus 1758) in Lake Tana, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Degsera --- , Ethiopia M Minwyelet --- , Ethiopia TG Yosef --- , EthiopiaNile tilapia Oreochromis niloticus is a commercially important fish species in the Lake Tana fishery and contributes to 65% of the total annual catch. This study estimated the maximum sustainable yield (MSY) and effort at maximum sustainable yield (fMSY) for... -
Is the largest African penguin colony in South Africa influencing local ocean productivity?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: G Passuni --- , South Africa LRD Human --- , South Africa SN Riddick --- , United States P Pattrick --- , South Africa M Bizani --- , South Africa SHP Deyzel --- , South Africa NA Strydom --- , South Africa TG Bornman --- , South Africa L Pichegru --- , South AfricaIn coastal waters, nutrient supplies originate principally from allochthonous sources, such as inputs from rivers, estuaries or oceanic waters. Recently, it has been suggested that marine life contributes to the nutrient load, with penguin colonies being the largest contributor worldwide... -
Reproductive biology of the lesser African threadfin Galeoides decadactylus in Gabon, Gulf of Guinea
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J-D Mbega --- , Gabon O Sadio --- , Senegal J-F Liwouwou --- , Gabon J-H Mvé Beh --- , Gabon I Bamba --- , Gabon A Eleng Spanian --- , Gabon M-L Yedi --- , Gabon F Cardiec --- , France F Le Loc’h --- , FranceThe lesser African threadfin Galeoides decadactylus (family Polynemidae) is one of the most captured marine fish species in Central Africa. This study examines aspects of the reproductive biology of G. decadactylus in the Libreville area of Gabon. Fish caught with... -
Are Cape Cormorants Phalacrocorax capensis losing the competition? Dietary overlap with commercial fisheries
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: OB Masiko --- , South Africa PG Ryan --- , South Africa CD van der Lingen --- , South Africa L Upfold --- , South Africa S Somhlaba --- , South Africa M Masotla --- , South Africa Y Geja --- , South Africa BM Dyer --- , South Africa RJM Crawford --- , South Africa AB Makhado --- , South AfricaCape Cormorants Phalacrocorax capensis breed in southern Africa’s Benguela upwelling system and in 2013 were listed as Endangered by the IUCN following a population decrease of >50% over their three most recent generations. This decrease was associated with reduced prey... -
Analysis of effectiveness of channels for information gathering and dissemination: Case of fisheries stakeholders in Mwanza and Mara regions of Tanzania
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Sadiki Lameck Kusyama --- , Tanzania Dina Machuve --- , Tanzania Michael Kisangiri --- , Tanzania Abswaid Mfanga --- , TanzaniaThe fisheries sub-sector in Tanzania is challenged with limited use of Information and Communication Technology (ICT) for information gathering and dissemination. Fishers obtain fisheries information from extension officers and their fellow fishers through mainly word of mouth in physical meetings... -
Trends in mussel cover, density and size at exploited and unexploited intertidal reefs in eastern South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Steyn --- , South Africa JC Groeneveld --- , South Africa J Santos --- , Norway XI Mselegu --- , South AfricaThe brown mussel Perna perna is the dominant indigenous mussel along the east coast of South Africa, where it is harvested by recreational and subsistence fishers. High fishing pressure near urban areas led to declining abundance and consequently to the... -
Spawning observations of Pomadasys commersonnii in the marine section of the Knysna estuarine bay, Western Cape, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EC Butler --- , South Africa A-R Childs --- , South Africa MKS Smith --- , South Africa RM Foster --- , South Africa WM Potts --- , South AfricaKnowledge of the location and timing of spawning events is critical for fisheries management. As is the case for many southern African fishes, the spotted grunter Pomadasys commersonnii was historically thought to reproduce in the coastal waters off KwaZulu-Natal Province... -
Assessing fish community response to water quality and habitat stressors in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Wesley Evans --- , South Africa Colleen T Downs --- , South Africa Matthew J Burnett --- , South Africa Gordon C O’Brien --- , South AfricaThe degradation of freshwater ecosystems can be attributed to stressors associated with the increased demand for water and other aquatic resources. Freshwater ecosystems face such challenges in supporting agriculture, industry, and high-density urban areas in KwaZulu-Natal (KZN) province, South Africa... -
Tidal influence on fish faunal occurrence and distribution in an estuarine mangrove system in Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NK Asare --- , Ghana JL Javier --- , United StatesThis study assessed the effects of tidal stages and habitat conditions on nekton assemblage and distribution in the Kakum River estuarine mangrove system in the Central Region of Ghana. Teleosts and crustaceans were sampled using pole seine and cast net... -
Using the Kariba Invitation Tiger Fishing Tournament for monitoring an invasive crayfish Cherax quadricarinatus in Lake Kariba, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LT Marufu --- , Zimbabwe C Phiri --- , Zimbabwe M Barson --- , Botswana T Nhiwatiwa --- , ZimbabweThe stomach contents of tigerfish Hydrocynus vittatus, caught in an angling competition on Lake Kariba, were examined to determine the extent to which they feed on the invasive crayfish Cherax quadricarinatus. The stomach contents of 281 tigerfish caught during three... -
Estimation of pesticide mixture interaction in Nile tilapia (Oreochromis niloticus) using survival analysis
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: KC Kanu --- , Nigeria NH Amaeze --- , Nigeria AA Otitoloju --- , NigeriaThe acute toxicity of the pesticides atrazine, mancozeb, chlorpyrifos and lambda-cyhalothrin, acting singly and jointly, was assessed on Nile tilapia (Oreochromis niloticus) fingerlings. Median lethal concentration (LC50), median lethal time (LT50), and mixture interaction were estimated, whereas survival analysis was... -
Age and growth of the Cape knifejaw Oplegnathus conwayi, an endemic South African teleost
Item type: Journal Article • Journal: African Zoology • Authors: RM Foster --- , South Africa A-R Childs --- , South Africa BQ Mann --- , South Africa WM Potts --- , South AfricaThe South African spearfishery targets a variety of data-deficient species, which are consequently poorly managed. This study aimed to describe the age and growth of one of these species, the Cape knifejaw, Oplegnathus conwayi, which is endemic to the southern... -
Movement behaviour of catface rockcod Mycteroperca (Epinephelus) andersoni (Epinephelidae) off the eastern seaboard of southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- , South Africa R Daly --- , South Africa GL Jordaan --- , South Africa WN Dalton --- , South Africa ST Fennessy --- , South AfricaMovement behaviour of the endemic epinephelid Mycteroperca andersoni (formerly allocated to genus Epinephelus) along the east coast of southern Africa was investigated using both conventional dart tagging and passive acoustic telemetry. Results from both methods showed that this species is... -
Variation of the relationships between lengths and weights applied to 123 fish species observed at Réunion Island (Indian Ocean)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Roos --- , Réunion J Taconet --- , Réunion C Gentil --- , Réunion B Brisset --- , Réunion H Evano --- , Réunion Y Aumond --- , Réunion J Huet --- , Réunion C Lepetit --- , Réunion R Boymond-Morales --- , Réunion T Rungassamy --- , Réunion R Elleboode --- , France K Mahé --- , FranceBody length–weight (L–W) relationships of 123 fish species (122 Actinopterygii and 1 Elasmobranchii) were studied from 10 218 individuals caught around Réunion Island from 2000 to 2021. All species, except for 4 with a very small number of individuals and... -
Supporting marine spatial planning with an ecosystem model of Algoa Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Ortega-Cisneros --- , South Africa E Weigum --- , South Africa R Chalmers --- , South Africa S Grusd --- , South Africa AT Lombard --- , South Africa L Shannon --- , South AfricaThe Ecopath with Ecosim (EwE) modelling framework was used to develop a model of Algoa Bay and test the ecosystem impacts of the implementation of the Addo Elephant National Park Marine Protected Area (MPA). The Ecopath model included 37 functional... -
Evidence for overfishing of tigerfish Hydrocynus vittatus (Castelnau 1861) in the Kavango River, Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FJ Jacobs --- , Namibia TF Naesje --- , Norway EM Ulvan --- , Norway CJ Hay --- , Namibia FH Khaebeb --- , Namibia OLF Weyl --- , South AfricaThe fishery for the African tigerfish Hydrocynus vittatus in northern Namibia makes a substantial contribution to surrounding food security and stimulates the local economy through subsistence and recreational fishing. However, local fishers suggest that catch rates of H. vittatus have... -
Macro- and micronutrient composition of estuarine roundherring (Gilchristella aestuaria) (Pisces: Clupeidae) in the Eastern Cape, South Africa: a potential dietary source of essential nutrients
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Zvavahera --- , South Africa S Hugo --- , South Africa NG Vine --- , South Africa OLF Weyl --- , South AfricaSouth Africa lacks research on the nutritional value of inland small fish species available to poor rural communities, despite the potential of such species to mitigate micronutrient deficiencies. Here we provide the first nutrient composition analysis for estuarine roundherring Gilchristella... -
First record from the southern hemisphere: significant range extension, new host record and molecular characterisation of Ligophorus minimus Euzet et Suriano, 1977 (Monogenea: Dactylogyridae)
Item type: Journal Article • Journal: African Zoology • Authors: Aline A Acosta --- , South Africa Kerry A Hadfield --- , South Africa Nico J Smit --- , South AfricaThe gill monogeneans from the genus Ligophorus Euzet et Suriano, 1977 are parasites strictly host specific to mugilid fishes, occurring on a number of mullet species. In South Africa, monogeneans from marine and estuarine teleost fishes are still poorly known... -
Characteristics and sociocultural impacts of small pelagic fishing by migrant fishers in Benin, West Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Ahouansou Montcho --- Université Nationale d’Agriculture, Bénin KV Salako --- University of Abomey-Calavi, Benin FJ Chadare --- Université Nationale d’Agriculture (UNA), Benin SC Gnansounou --- University of Abomey-Calavi, Benin Z Sohou --- Institut de Recherches Halieutiques et Océanologiques du Bénin (IRHOB), Bénin P Failler --- University of Portsmouth, United Kingdom R Glèlè Kakaï --- University of Abomey-Calavi, Benin AE Assogbadjo --- University of Abomey-Calavi, BeninSmall pelagic fish species contribute substantially to the food security and livelihoods of local communities in developing countries. In West Africa, and particularly in Benin, small pelagic fisheries attract many migrant fishers who are key actors in the sector. This... -
Estimating the economic damage caused by jellyfish to fisheries in Morocco
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: B Mghili --- University Abdelmalek Essaâdi, Morocco M Analla --- University Abdelmalek Essaâdi, Morocco M Aksissou --- University Abdelmalek Essaâdi, MoroccoAlthough there is great fluctuation in annual recordings of jellyfish along the Moroccan Mediterranean coast and an absence of long-term datasets, there is a common perception that jellyfish numbers are rising. To better understand the possible economic losses sustained by... -
Maturity length, fecundity and spawning season of Atlantic chub mackerel Scomber colias in the coastal waters of Ghana (west-central Gulf of Guinea)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JE Kassah --- University of Cape Coast, Ghana J Blay --- Centre for Coastal Management (Africa Centre of Excellence in Coastal Resilience), University of Cape Coast, Ghana I Okyere --- University of Cape Coast, Ghana N Lazar --- University of Rhode Island, United StatesAspects of the reproductive biology of Atlantic chub mackerel Scomber colias are reported here based on data from random samples of artisanal fish landings from Ghana. The specimens were between 13.7 cm and 40.7 cm total length (TL), and both... -
The Freshwater Biodiversity Information System (FBIS) – mobilising data for evaluating long-term change in South African rivers
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Helen Dallas --- , South Africa Jeremy Shelton --- , South Africa Tim Sutton --- , South Africa Dimas Tri Cuptura --- , South Africa Mohammed Kajee --- , South Africa Nancy Job --- , South AfricaAccess to long-term biodiversity datasets is vital for monitoring, managing and protecting freshwater ecosystems. Detecting critical ecosystem changes, such as losing unique biodiversity and ecosystem services, is dependent on access to data. A wealth of biodiversity data exists for river... -
Validation of lipid extraction and correction methods for stable isotope analysis of freshwater food webs in southern Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A van der Merwe --- , South Africa A Myburgh --- , South Africa G Hall --- , South Africa A Kaiser --- , South Africa S Woodborne --- , South AfricaStable isotope analysis is ubiquitous as a method to investigate food-web dynamics at various scales in aquatic ecology. Most studies make use of dorsal muscle tissue, which involves lethal sampling of the fish. The sampling of muscle tissue is often... -
An assessment of the impact of participation in the Oceanographic Research Institute’s Cooperative Fish Tagging Project on angler attitudes and behaviour
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JB Mann-Lang --- , South Africa BQ Mann --- , South Africa GL Jordaan --- , South Africa R Daly --- , South AfricaScientific output has proven the value of the Oceanographic Research Institute’s Cooperative Fish Tagging Project (ORI-CFTP) to biological and fisheries research, with more than 95 published manuscripts based on data from the ORI-CFTP. This study reviews the project from the... -
New host–parasite associations of Cymothoidae (Crustacea, Isopoda) infesting elasmobranch fishes in Tunisian waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: F Youssef --- El Manar University, Tunisia B Benmansouand --- El Manar University, Tunisia Z Ramdane --- University of Bejaia, AlgeriaBetween 2015 and 2020, 2 092 specimens of cartilaginous fishes (Chondrichthyes: Elasmobranchii) belonging to eight species and five genera were sampled along the Tunisian coast and examined for their cymothoid parasites, Among the eight examined elasmobranch species, only three were... -
Patterns of fish distribution in tropical rock pools at Príncipe Island, Gulf of Guinea
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Azevedo e Silva --- University of Lisbon, Portugal AJ Almeida --- University of Lisbon, Portugal M Cravo --- University of Lisbon, Portugal MP Pais --- University of Lisbon, Portugal Y Santos --- , São Tomé e Príncipe J Paula --- University of Lisbon, PortugalLittle is known about the ichthyofauna from intertidal rock pools of the west coast of Africa, especially in the Gulf of Guinea. Rock pools are characteristic habitats of the intertidal zone of structurally complex rocky shores, adding important niche space... -
Understanding the translocation dynamics of Nile tilapia (Oreochromis niloticus) and its ecological consequences in East Africa
Item type: Journal Article • Journal: African Zoology • Authors: Papius Dias Tibihika --- National Fisheries Resources Research Institute, Uganda Harald Meimberg --- Institute for Integrative Nature Conservation Research, University of Natural Resources and Life Sciences Vienna (BOKU), Austria Manuel Curto --- Institute for Integrative Nature Conservation Research, University of Natural Resources and Life Sciences Vienna (BOKU), AustriaThe Nile tilapia (Oreochromis niloticus) is the second-most economically important fish species in East African countries (EAC), surpassed only by the Nile perch (Lates niloticus). It is the most-farmed freshwater fish species in EAC and the second-most-farmed worldwide. Currently, in... -
HIV fatalism and engagement in transactional sex among Ugandan fisherfolk living with HIV
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Katelyn M. Sileo --- , , USA Laura M. Bogart --- , USA Glenn J. Wagner --- , USA William Musoke --- , Uganda Rose Naigino --- , , Uganda Barbara Mukasa --- , Uganda Rhoda K. Wanyenze --- , , UgandaHIV fatalism, or the belief that HIV acquisition and mortality is out of one's control, is thought to contribute to HIV risk in fishing populations in East Africa. The objective of this cross-sectional study was to investigate the association between... -
Southern mullets (Chelon richardsonii) as a potential biological indicator for mercury pollution in the Walvis Bay lagoon, Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Veronica Kaleinasho Kapula --- University of Namibia, Namibia Hilkka Opolili Ndahafa Ndjaula --- University of Namibia, Namibia Stephanus Hamutenya --- , Namibia Johannes Angala Iitembu --- University of Namibia, NamibiaSouthern mullet Chelon richardsonii is one of the important fish species found in the Walvis Bay lagoon (WBL) that is commercially exploited for local consumption. The southern mullet is, however, exposed to mercury (Hg) found in sediments, which forms part... -
New host and distribution records for five species of Enterogyrus Paperna, 1963 (Dactylogyridae: Ancyrocephalinae) from cichlid hosts in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Iva Přikrylová --- University of Limpopo, South Africa Sareh Tavakol --- University of Limpopo, South Africa Nico J Smit --- North-West University, South Africa Willem J Smit --- University of Limpopo, South Africa Wilmien J Luus-Powell --- University of Limpopo, South AfricaBetween March 2015 and September 2016, three species of Cichlidae (Coptodon rendalli, Oreochromis mossambicus and Tilapia sparrmanii) were screened for the presence of stomach monogeneans. Four localities across three provinces of South Africa (Limpopo, Northern Cape and North West) were... -
Colonisation theory and invasive biota: the Great Fish River case history, 35 years later
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Pule P Mpopetsi --- Rhodes University, South Africa Wilbert T Kadye --- Rhodes University, South AfricaUsing the Great Fish River, South Africa, Laurenson and Hocutt (1986) proposed a colonisation theory outlining the characteristics of successful invaders and the properties of aquatic habitats that facilitate successful fish invasions. The Great Fish River has modified flow due... -
Movement patterns and growth rate of Scotsman Polysteganus praeorbitalis (Sparidae) tagged in the Pondoland Marine Protected Area, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: BQ Mann --- Oceanographic Research Institute, South Africa WN Dalton --- Oceanographic Research Institute, South Africa GL Jordaan --- Oceanographic Research Institute, South Africa R Daly --- Oceanographic Research Institute, South AfricaA tag-recapture study was undertaken on Polysteganus praeorbitalis in the Pondoland Marine Protected Area (PMPA) on the east coast of South Africa. A total of 1 042 fish were tagged over a period of 16 years and 255 individuals (24.5%)... -
Biological and life-history parameters for Labeo rosae Steindachner, 1894 and Oreochromis mossambicus (Peters, 1852) from Flag Boshielo Dam, Olifants River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HA Hlungwani --- University of Limpopo, South Africa SM Marr --- University of Limpopo, South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa JR Sara --- University of Limpopo, South AfricaInland fisheries contribute towards food security for rural communities living close to large aquatic systems. However, sustainable inland fisheries rely on accurate biological information for the target species at the proposed fishery location. In this study, the biological information for... -
Status of diversity, abundance and seasonal variations of gill net catches of cichlids in Lake Bosumtwi, Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Asase --- University of Ghana, Ghana TL Lauridsen --- Aarhus University, Denmark PO Sanful --- University of Energy and Natural Resources, Ghana EEK Quansah --- University of Ghana, Ghana FKE Nunoo --- University of Ghana, GhanaThe cichlids in Lake Bosumtwi are under increasing pressure with a recent build-up in local fishing pressure. This study was conducted to assess the status and seasonal catch rates of fish species using gillnets over a two-year period. Four species... -
The road towards effective governance and management of marine protected areas in South Africa: evolving policies, paradigms and processes
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SP Kirkman --- , South Africa P Kowalski --- , South Africa BQ Mann --- Oceanographic Research Institute (ORI), South Africa GM Branch --- University of Cape Town, South Africa MG van der Bank --- South African National Biodiversity Institute (SANBI), South Africa KJ Sink --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa P Fielding --- , South Africa JB Mann-Lang --- Oceanographic Research Institute (ORI), South Africa MC Pfaff --- University of Cape Town, South Africa D Kotsedi --- , South Africa R Adams --- , South Africa S Dlulisa --- , South Africa SL Petersen --- , MadagascarThe efficacy of marine protected areas (MPAs) depends on their governance and management. We review their history in South Africa and recognise four periods. Period 1 (1964–1994) provided initial protection but was based on exclusionary, preservationist policies, was ad hoc... -
Movement patterns and underestimation of the maximum age of a Vulnerable endemic guitarfish species inferred from mark-recapture studies
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TS Murray --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa C Elston --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa RH Bennett --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa A-R Childs --- Rhodes University, South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaData collected from mark-recapture programmes have proven invaluable in assessing the movements and growth of numerous fishery species along the South African coastline. This short note reports on tag and recapture information on the Vulnerable endemic lesser guitarfish Acroteriobatus annulatus... -
Barriers to linkage and retention in HIV care still persist among adolescent girls and young women in western Kenya
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Zachary A Kwena --- Kenya Medical Research Institute, Kenya Rivet K Amico --- University of Michigan, USA Tsitsi B Masvawure --- College of the Holy Cross, USA Kenneth K Ngure --- Jomo Kenyatta University of Agriculture and Technology, Kenya Elizabeth A Bukusi --- Kenya Medical Research Institute, Kenya Robert H Remien --- New York State Psychiatric Institute and Columbia University, USA Perez O Ochwal --- Kenya Medical Research Institute, Kenya Nadia Nguyen --- New York State Psychiatric Institute and Columbia University, USA Joanne E Mantell --- New York State Psychiatric Institute and Columbia University, USAAdolescent girls and young women (AGYW) in sub-Saharan Africa experience delayed linkage to and poor retention in HIV care. Identifying and addressing specific barriers in HIV care programming is important to achieving the upgraded UNAIDS 95-95-95 targets and epidemic control... -
Mapping fine-scale demersal trawl effort for application in ecosystem assessment and spatial planning
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Currie --- South African National Biodiversity Institute (SANBI), South Africa LR Harris --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa LJ Atkinson --- South African Environmental Observation Network (SAEON), South Africa TP Fairweather --- Fisheries and the Environment (DFFE), South Africa KJ Sink --- South African National Biodiversity Institute (SANBI), South AfricaFine-scale maps of fishing activity are valuable information layers for fisheries management, assessments of biodiversity impacts and marine spatial planning. Our aim was to develop an accurate map of demersal trawling intensity in South Africa and to demonstrate its utility... -
Impact analysis of innovation and gendered constraints in the fisheries sector of southern Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Edward Ebo Onumah* --- University of Ghana Legon-Accra, Ghana Martha Joycelyn Makafui Dogbey --- University of Ghana Legon-Accra, Ghana Freda Elikplim Asem --- University of Ghana Legon-Accra, GhanaThis paper adopts the multinomial endogenous treatment effect approach to analyze the impact of innovation choices on the income of 230 fish workers in the Greater Accra and Central regions of Ghana, while the Kendall’s ranking technique is applied to... -
Effect of rotational harvesting on the size composition of Cape rock oysters Striostrea margaritacea on the east coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Steyn --- Oceanographic Research Institute, South Africa JC Groeneveld --- Oceanographic Research Institute, South Africa J Santos --- Norwegian College of Fishery Science, Uit – The Arctic University of Norway, NorwayA commercial fishery for the Cape rock oyster Striostrea margaritacea along the north coast of KwaZulu-Natal, South Africa (western Indian Ocean), follows a 4-year rotational cycle, with each harvest year followed by 3 fallow years across four harvest zones. We... -
The changing status of important marine fishery species in selected South African estuaries
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AK Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa BQ Mann --- Rhodes University, South AfricaThis review examines the changing status of 10 estuary-dependent marine fish species in 10 South African estuarine systems, ranging from the Kosi Estuary in the northeast to the Berg Estuary in the southwest. In all of these systems, the selected... -
Geographical and seasonal patterns in the diet of Cape fur seals Arctocephalus pusillus pusillus in Namibia, based on extensive scat analyses
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: DN Mwaala --- University of Namibia, Namibia MR Wilhelm --- University of Namibia, Namibia SP Kirkman --- Fisheries and the Environment (DFFE): Branch Oceans and Coasts, South Africa J-P Roux --- Ministry of Fisheries and Marine Resources, NamibiaNamibia's population of Cape fur seals Arctocephalus pusillus pusillus is a major constituent of top predator biomass in the northern Benguela upwelling system. Understanding their diet is key to comprehending their role in the ecosystem and potential drivers of recent... -
Impact of interactions between common bottlenose dolphins and purse-seiners in the Moroccan Mediterranean region: case study in the Al Hoceima fishing grounds
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Keznine --- Abdelmalek Essaâdi University, Morocco B Mghili --- Abdelmalek Essaâdi University, Morocco H Awadh --- Abdelmalek Essaâdi University, Morocco M Analla --- Abdelmalek Essaâdi University, Morocco M Aksissou --- Abdelmalek Essaâdi University, MoroccoThis study examines the effect of common bottlenose dolphins Tursiops truncatus on the purse-seine fishery for small pelagic fishes in the Mediterranean Sea and the economic consequences thereof. The investigation focused on the fleet registered at the port of Al... -
‘Bahari Imekufa, The Sea is Dead’: Local Perceptions of Ocean Health and Ocean Wealth among Fishers on the Kenyan Coast
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Jacky Kosgei --- WiSER, University of the Witwatersrand, South AfricaUsing narratives that I recorded in June/July 2021 on Kenya’s south coast with fishers belonging to three different generations, this paper provides insights into local articulations of changes that have happened in the sea over time. These changes — which... -
Species diversity and distribution-pattern determinants of African rivulines (Cyprinodontiformes: Nothobranchiidae) in rainforest streams of southern Cameroon
Item type: Journal Article • Journal: African Zoology • Authors: FD Messu Mandeng --- Higher Teacher’s Training College (ENS), University of Yaoundé I, Cameroon CF Bilong Bilong --- University of Yaoundé I, Cameroon JF Agnese --- University of Montpellier (CNRS, IRD, EPHE), FranceUnderstanding the community structure and ecology of fish populations in rainforest streams is a prerequisite for any actions towards their exploitation, management or conservation. We examined the community structure and species diversity of nothobranchiids (African rivulines) in rainforest streams of... -
Status and distribution of a novel redfin lineage, Pseudobarbus sp. ‘burchelli Tradouw’ from the Cape Fold Ecoregion of South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Martine S. Jordaan --- , South Africa Stuart Barrow --- , South Africa Wilbert Kadye --- Rhodes University, South Africa Albert Chakona --- NRF-South African Institute for Aquatic Biodiversity (NRF-SAIAB), South AfricaFreshwater fish are threatened globally and in addition, knowledge of their diversity is incomplete and species richness is underestimated. Within the ichthyofauna of the Cape Fold Ecoregion of South Africa, many undescribed lineages exist and for most of these, information... -
Predation on the St Joseph Callorhinchus capensis by Cape fur seals Arctocephalus pusillus pusillus in Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RH Leeney --- Namibia Nature Foundation, Namibia N Dreyer --- Ocean Conservation Namibia, NamibiaChondrichthyans form an important part of marine food webs as top predators and mesopredators. However, little is known about chondrichthyans in Namibian waters and the roles they play in ecosystem function. During efforts to disentangle Cape fur seals Arctocephalus pusillus... -
Spatial patterns and environmental drivers of demersal fish assemblages in the Swartkops and Sundays estuarine to marine seascapes, South Africa
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: P Nodo --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa AR Childs --- Rhodes University, South Africa P Pattrick --- Nelson Mandela University, South Africa NC James --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaEstuaries are often observed as the boundary between the ocean and the river, separating coastal environments, rather than being seen as a continuum. Owing to insufficient research on demersal fish communities across nearshore marine to estuarine habitats, particularly in South... -
Optimal system and conservation laws for the generalized Fisher equation in cylindrical coordinates
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A.H. Kara --- University of the Witwatersrand, South Africa Sonia Naseer --- Government College University, Pakistan Ali Raza --- Lahore School of Economics, Pakistan F.D. Zaman --- Government College University, PakistanThe reaction diffusion equation arises in physical situations in problems from population growth, genetics and physical sciences. In many practical situations, the physical domain of the problem is adequately described in cylindrical Coordinates. Therefore, we consider the Fisher equation in... -
Comparison of the acute toxicity and behavioural effects of two pyrethroids on African catfish Clarias gariepinus fingerlings
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EO Ogueji --- Alex Ekwueme Federal University, Nigeria JJ Ekpenyong --- Alex Ekwueme Federal University, Nigeria GU Amana --- Kogi State University, Nigeria EB Tabi --- Alex Ekwueme Federal University, Nigeria IB Okey --- Cross River University of Technology, Nigeria MO Olaolu --- Alex Ekwueme Federal University, Nigeria JN Nwakpa --- Ebonyi State University, NigeriaTwo of the most-commonly used pyrethroid insecticides were subjected to static bioassays to determine their acute toxicity to Clarias gariepinus fingerlings, followed by comparisons of their impact on mortality and behavioural changes in the fish. The LC50 values for deltamethrin... -
Potential for a commercial inland fishery or just another water storage facility at Spring Grove Dam, KwaZulu-Natal, South Africa?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Matthew J Burnett --- Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, South Africa Céline Hanzen --- Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, South Africa Alex Whitehead --- Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, South Africa Gordon C O’Brien --- Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, South Africa Colleen T Downs --- Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, South AfricaSouth Africa's inland fisheries are generally undervalued, though there is developing interest in the sector. Spring Grove Dam in the KwaZulu-Natal Midlands became operational as a water storage facility in 2013 to provide water to the growing urban population in... -
Future of the IUCN Endangered white steenbras Lithognathus lithognathus (Sparidae) – a tale of two estuaries
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AK Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa MKS Smith --- Rhodes University, South AfricaThis review draws on a long history of ichthyological and fisheries research to examine the changing stock status of the estuary-dependent white steenbras Lithognathus lithognathus in the South African Swartkops and Knysna estuaries. The available evidence points to a major... -
Per-recruit analysis and proposed sustainable harvest strategy for rednose labeo Labeo rosae and Mosambique tilapia Oreochromis mossambicus in Flag Boshielo Dam, Olifants River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Marr --- University of Limpopo, South Africa HA Hlungwani --- University of Limpopo, South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa JR Sara --- University of Limpopo, South AfricaInland fisheries development in South Africa has been proposed to improve rural livelihoods and food security. However, inland fisheries are susceptible to collapse through overfishing. Therefore, establishing biological reference points for these fisheries is essential for long-term sustainability. Here, spawner-biomass-per-recruit... -
Perceptions and knowledge about the use of biological indicators in freshwater ecosystem monitoring in Rwanda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Nzarora --- College of Science and Technology, University of Rwanda, Rwanda C Cocquyt --- , Belgium V Nzibaza --- Center of Excellence in Biodiversity and Natural Resources Management, University of Rwanda, Rwanda V Nsengimana --- College of Science and Technology, University of Rwanda, Rwanda PJ Mugume --- Center of Excellence in Biodiversity and Natural Resources Management, University of Rwanda, Rwanda BA Kaplin --- College of Science and Technology, University of Rwanda, RwandaThe use of biological monitoring (biomonitoring) to assess water quality is recognised alongside the use of chemical and physicochemical parameters due to its ability and efficiency in providing information about both current and long-term changes. Indeed, biomonitoring is applied in... -
A rapid fishery assessment to collect biological information and life-history parameters for rednose labeo Labeo rosae and Mozambique tilapia Oreochromis mossambicus in Loskop Dam, Olifants River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HA Hlungwani --- University of Limpopo, South Africa SM Marr --- University of Limpopo, South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa AC Hoffman --- , South Africa H Botha --- University of Limpopo, South Africa JR Sara --- University of Limpopo, South AfricaA 2-week rapid fishery assessment using various sampling gears was conducted to collect life-history data on rednose labeo Labeo rosae and Mozambique tilapia Oreochromis mossambicus in Loskop Dam on the Olifants River, Mpumalanga Province, South Africa. These native species were... -
Socio-ecological change in bait fisheries for the common sandprawn Kraussillichirus kraussi in Durban Harbour, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Chetty --- Oceanographic Research Institute (ORI), South Africa E Steyn --- Oceanographic Research Institute (ORI), South Africa JC Groeneveld --- Oceanographic Research Institute (ORI), South AfricaBait fishing for the common sandprawn Kraussillichirus kraussi in Durban Harbour, on the east coast of South Africa, has a history going back to the early 20th century and has been influenced by port development and political changes over time... -
Eunicid polychaete worms used as bait with particular reference to Australia, South Africa and France; the need for development of management plans based on their biology and ecology
Item type: Journal Article • Journal: African Zoology • Authors: Pat Hutchings --- Australian Museum Research Institute, Australia Jyothi Kara --- , South Africa Nicolas Lavesque --- CNRS, Université de Bordeaux, Bordeaux INP, EPOC,Worldwide, bait worms are collected for recreational and subsistence fishing, and fetch high prices in bait shops. While a variety of polychaete families are collected, we focus only on the “Marphysa” group (Family Eunicidae) occurring in rivers, estuaries and protected... -
Value-chain analysis of Kenya’s artisanal tuna fishery focusing on skipjack tuna Katsuwonus pelamis and kawakawa Euthynnus affinis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: FA Mzingirwa --- Rhodes University, South Africa GM Okemwa --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya O Marcone --- , United Kingdom CS Bova --- Rhodes University, South Africa S Viana --- Rhodes University, South Africa WHH Sauer --- Rhodes University, South AfricaThis study investigates the value chain of Kenya’s artisanal tuna fishery targeting skipjack tuna Katsuwonus pelamis and kawakawa Euthynnus affinis. The study used an integrated approach combining a questionnaire survey and catch assessment data at four landing sites along the... -
Size structure and reproductive biology of skipjack tuna Katsuwonus pelamis and kawakawa Euthynnus affinis in the western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: FA Mzingirwa --- Rhodes University, South Africa GM Okemwa --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya MW Farthing --- Rhodes University, South Africa CS Bova --- Rhodes University, South Africa JS Halafo --- Instituto Oceanográfico de Moçambique (InOM), Mozambique JG Mshana --- Sokoine University of Agriculture, Tanzania AA Abubakar --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya N Ishmael --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya WHH Sauer --- Rhodes University, South AfricaSkipjack tuna Katsuwonus pelamis and kawakawa Euthynnus affinis are economically important tuna species targeted by artisanal fishers in the western Indian Ocean. Both species are currently considered sustainably fished despite substantial catches. Even so, ongoing management is crucial to maintain... -
Exploratory characterisation of recreational fishing for skipjack tuna Katsuwonus pelamis and eastern little tuna Euthynnus affinis in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Viana --- University of Cape Town, South Africa MW Farthing --- Rhodes University, South Africa C Bova --- Rhodes University, South Africa O Marcone --- , United Kingdom WHH Sauer --- Rhodes University, South AfricaDespite being important to artisanal and industrial fisheries, little is known about the role of skipjack tuna Katsuwonus pelamis and the eastern little tuna (or kawakawa) Euthynnus affinis in recreational fisheries. This study used a banner-recruited, online questionnaire of recreational... -
Littoral substrates and nest properties of Coptodon rendalli vary with distance from the shoreline in a tropical impoundment, southeast Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RJ Chateya --- National University of Science and Technology, Zimbabwe HGT Ndagurwa --- National University of Science and Technology, ZimbabweThe change in littoral substrates and Coptodon rendalli nest properties along the inshore–offshore gradient of Mushandike Dam in southeast Zimbabwe, impacted by long-term water-level fluctuations, were studied in March 2016. Substrate and nest properties were measured in four contiguous 25... -
The bio-invasion and population dynamics of Cherax quadricarinatus in Zambian waters
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Eva Nambeye --- University of Zambia, Zambia Chibwe Katapa --- University of Zambia, Zambia Bernadette Chimai Mulenga --- University of Zambia, Zambia Hangoma Gordon Mudenda --- University of Zambia, Zambia Marjatta Eilitta --- , United States Michael A Rice --- University of Rhode Island, United StatesSince the 1990s, the exotic Australian redclaw crayfish, Cherax quadricarinatus, has been spreading in the Zambezi River basin in Zambia. The population structure of crayfish was determined at locations along the north shore of Lake Kariba 'near Siavonga' and the... -
First report of Dactylogyrus fimbriphallus (El Gharbi, Birgi & Lambert, 1994) infecting Luciobarbus biscarensis (Boulenger, 1911) in Oued Tadmit River of Djelfa Governorate (Algeria)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Djouhina Chabira --- University of Biskra, Algeria Badreddine Attir --- University of Biskra, Algeria Nurten Aydoğdu --- Balıkesir University, Türkiye Adel Mammeri --- University of Biskra, AlgeriaThis study aimed to determine the occurrence of dactylogyrid communities in Sahara barbel, Luciobarbus biscarensis (Boulenger, 1911), an endemic species to Algeria, according to season and host factors. A total of 78 samples of L. biscarensis were collected seasonally, over... -
Changes in the macrobenthic community structure associated with finfish farming in Richards Bay Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SF Nzama --- University of Zululand, South Africa L Vivier --- University of Zululand, South Africa A De Fortier --- University of Zululand, South AfricaGlobally, aquaculture has shown the potential to boost economic activity and enhance food security. However, controversy exists around large-scale finfish farming, with objections centred around potential environmental issues (especially eutrophication). Given this, the effects of a trial dusky kob (Argyrosomus... -
Advancing disease-resistant stock in aquaculture: a brief overview
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Nur Nashyiroh Izayati Mastor --- Borneo Marine Research Institute, Universiti Malaysia Sabah, Malaysia Wahidatul Husna Zuldin --- Borneo Marine Research Institute, Universiti Malaysia Sabah, Malaysia Norfazreena Mohd Faudzi --- Borneo Marine Research Institute, Universiti Malaysia Sabah, Malaysia Kenneth Francis Rodriques --- Higher Institution Centre of Excellence (HICoE), Borneo Marine Research Institute, Universiti Malaysia Sabah, Malaysia Julian Ransangan --- Borneo Marine Research Institute, Universiti Malaysia Sabah, MalaysiaThe effective management of diseases caused by aquatic pathogens is one of the primary challenges in aquaculture. The breeding of disease-resistant fish requires a combination of traditional and modern genetic approaches. With an increasing global population and demand for food,... -
Rapid assessment of the Seychelles octopus (Octopus cyanea) fishery value chain: insights for sustainable management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J McCafferty --- Rhodes University, South Africa A Ebrahim --- , Seychelles WHH Sauer --- Rhodes University, South Africa R Wright --- , South Africa A Vidot --- , Seychelles V Schmidt --- Food and Agriculture Organization of the United Nations (FAO), ItalyThe octopus fishery for Octopus cyanea in Seychelles plays an important role in local cuisine, culture and tourism, yet it is unmanaged unlike other octopus fisheries in the western Indian Ocean region. We conducted a rapid assessment of the octopus... -
Spatial environmental variability shapes the diversity of bottom ecosystems on the western Gulf of Guinea shelf
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Denechaud --- Institute of Marine Research (IMR), Norway E Dovlo --- Fisheries Scientific Survey Division (FSSD), Ghana T Joanny --- Centre de Recherches Océanologiques (CRO), Côte d’Ivoire VS Osei --- Fisheries Scientific Survey Division (FSSD), Ghana L Buhl-Mortensen --- Institute of Marine Research (IMR), Norway A Staby --- Institute of Marine Research (IMR), NorwayThe western Gulf of Guinea is characterised by seasonal upwellings and hosts a large diversity of marine species. Although the assemblages of bottom fishes and benthic organisms are periodically assessed, there has been little research investigating these in tandem. We... -
8. “Fish, chicken, lean meat and eggs can be eaten daily”: a food-based dietary guideline for South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Schonfeldt HC [cor1] Pretorius B --- Research Consultant Institute for Food, Nutrition and Well-being, University of Pretoria, Hall N --- Research Consultant Institute for Food, Nutrition and Well-being, University of Pretoria,Food products from animals provide a variety of macro- and micronutrients. Animal sources of food, such as fish, chicken, meat and eggs, constitute high-quantity and high-quality protein, as they contain essential amino acids in the right proportions. In South Africa,... -
Establishing a basis for recognising marine ‘other effective area-based conservation measures’ (OECMs) in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SP Kirkman --- Fisheries and the Environment (DFFE), South Africa P Kowalski --- , South Africa SD Holness --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa LJ Atkinson --- , South Africa R Brand --- Western Cape Government, South Africa L Dunga --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa TP Fairweather --- Fisheries and the Environment (DFFE), South Africa T Goldman --- Rhodes University, South Africa D Marnewick --- Eastern and Southern Africa Regional Office, South Africa J Nhleko --- Fisheries and the Environment (DFFE), South Africa R Peter --- Fisheries and the Environment (DFFE), South Africa C Smith --- World Wide Fund for Nature – South Africa (WWF-SA), South Africa MG van der Bank --- South African National Biodiversity Institute (SANBI), Kirstenbosch Research Centre, South Africa G van der Heever --- Fisheries and the Environment (DFFE), South Africa L van Niekerk --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa KA Wright --- Wildlands Conservation Trust (WILDTRUST), South Africa KJ Sink --- Institute for Coastal and Marine Research, Nelson Mandela University, South AfricaThe concept of ‘other effective area-based conservation measures’ (OECMs) and its technical guidance provide opportunities for recognising a broader range of area-based management measures that contribute to biodiversity conservation outside of protected areas. However, progress towards the recognition of OECMs... -
Listening to the voices of Namibia’s recreational anglers to improve shore-based fishery resource use and management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NMC Gusha --- University of Namibia, Namibia AM Veii --- University of Namibia, Namibia NM Nghipangelwa --- University of Namibia, Namibia AS Shikongo --- University of Namibia, Namibia CS Bova --- Rhodes University, South Africa A Kanyimba --- University of Namibia, Namibia GH Engelhard --- Fisheries and Aquaculture Science (Cefas), United Kingdom K Hyder --- Fisheries and Aquaculture Science (Cefas), United Kingdom B Snow --- Scottish Association for Marine Science (SAMS), United Kingdom WM Potts --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa MR Wilhelm --- University of Namibia, NamibiaIn most fisheries, the traditional centralised, top-down management approach is still prevalent despite its limited success. While a bottom-up ecosystem-based approach is increasingly preferred, a shift in focus from purely ecological considerations to a socio-ecological system approach is necessary. The... -
Impact of catch and release on the welfare of bronze seabream Pachymetopon grande in the South African marine shore-based fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EC Butler --- Rhodes University, South Africa MW Farthing --- Rhodes University, South Africa CS Bova --- Rhodes University, South Africa A-R Childs --- Rhodes University, South Africa WM Potts --- Rhodes University, South AfricaThe practice of catch-and-release (C&R) angling is increasingly being integrated into recreational fisheries as a conservation strategy to promote sustainability. However, C&R can still have lethal or sublethal effects owing to various stressors involved in the act of angling. Using... -
The movements of adult leerfish Lichia amia in the Breede Estuary, Western Cape, South Africa: insights from acoustic telemetry
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WM Kilian --- Rhodes University, South Africa TS Murray --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa JD Filmalter --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa TF Næsje --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa RJ Wasserman --- Rhodes University, South AfricaLeerfish Lichia amia inhabit estuaries as juveniles before moving between estuaries and the marine environment as sub-adults and adults. While adults remain mostly in the marine environment, philopatry has been observed, with individuals returning to areas previously used, including estuaries... -
Influence of the Benguela Upwelling System on the genetic connectivity of blacktail seabream Diplodus capensis across southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WF Olivier --- Genetics and Microbiology, University of Pretoria, South Africa WM Potts --- Rhodes University, South Africa A-R Childs --- Rhodes University, South Africa C Santos --- Agostinho Neto University, Angola PW Shaw --- Aberystwyth University, R Henriques --- Genetics and Microbiology, University of Pretoria, South AfricaOceanographic features such as upwelling cells and currents contribute to shaping the evolutionary history of marine fishes, including species that may be important socio-economic resources. However, the impacts of these barriers are often cryptic and may change, particularly in a... -
Horizon scanning to identify priority research questions for the South African marine shore-based recreational fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Hewett --- Rhodes University, South Africa CS Bova --- Rhodes University, South Africa EC Butler --- Rhodes University, South Africa A-R Childs --- Rhodes University, South Africa MW Farthing --- Rhodes University, South Africa BQ Mann --- Rhodes University, South Africa JB Mann-Lang --- Rhodes University, South Africa AC Winkler --- Rhodes University, South Africa K Hyder --- Centre for Environment Fisheries and Aquaculture Science, United Kingdom WM Potts --- Rhodes University, South AfricaThe marine shore-based recreational fishery (MSBRF) is the largest sector of the South African linefishery. The high rate of participation, widely dispersed effort, the diversity of motivations, attitudes and perceptions of its participants, and the large number of target species... -
Individual variability in the thermal limits of juvenile dusky kob Argyrosomus japonicus from a permanently open estuary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Frachet --- Rhodes University Department of Ichthyology and Fisheries Sciences, South Africa A-R Childs --- Rhodes University Department of Ichthyology and Fisheries Sciences, South Africa AC Winkler --- Rhodes University Department of Ichthyology and Fisheries Sciences, South Africa MW Farthing --- Rhodes University Department of Ichthyology and Fisheries Sciences, South Africa CD Hempel --- Rhodes University Department of Ichthyology and Fisheries Sciences, South Africa WM Potts --- Rhodes University Department of Ichthyology and Fisheries Sciences, South AfricaGlobally, fish are facing the pressure of increasing thermal variability, which challenges the physiological capacity and resilience of species at the level of the individual, population and community. As transition zones, estuarine ecosystems are becoming increasingly thermally dynamic, which affects... -
Unravelling the mystery of a unique giant trevally Caranx ignobilis aggregation in the Mtentu Estuary, Pondoland Marine Protected Area, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RB Dixon --- Rhodes University, South Africa BQ Mann --- Rhodes University, South Africa TS Murray --- Rhodes University, South Africa PD Cowley --- Rhodes University, South Africa R Daly --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaThe giant trevally Caranx ignobilis (family Carangidae) is an iconic apex predatory fish valued by recreational and commercial fisheries globally. A seasonal but episodic aggregation of up to ∼1 000 individuals takes place in the Mtentu Estuary in the Eastern... -
Using DNA barcoding to identify the early life history stages of demersal coastal fishes in shallow nearshore and estuarine benthic habitats of Algoa Bay
Item type: Journal Article • Journal: African Zoology • Authors: P Nodo --- South African Institute for Aquatic Biodiversity, South Africa P Pattrick --- Nelson Mandela University, South Africa A-R Childs --- South African Institute for Aquatic Biodiversity, South Africa NC James --- South African Institute for Aquatic Biodiversity, South AfricaThe accurate identification of early life history stages of fishes, including larval and transformation stages to species level, is critical in spatial and temporal studies of coastal fish assemblages. This enables a better understanding of species-specific settlement patterns, nursery habitat... -
HIVST in the presence of a partner among fishermen in Western Kenya: A qualitative study
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Peter Abade --- Impact Research and Development Organization, Kenya Phoebe Olugo --- Impact Research and Development Organization, Kenya Sarah A. Gutin --- Department of Community Health Systems, School of Nursing, University of California San Francisco, USA Holly Nishimura --- Department of Medicine, Division of Prevention Sciences, University of California San Francisco, USA Jayne Lewis-Kulzer --- Department of Obstetrics, Gynecology and Reproductive Sciences, University of California San Francisco, USA Marguerite Thorp --- Division of Infectious Diseases, University of California, USA Benard Ayieko --- Impact Research and Development Organization, Kenya Lennah Oluoch --- Impact Research and Development Organization, Kenya David Angawa --- Impact Research and Development Organization, Kenya Carol S. Camlin --- Department of Medicine, Division of Prevention Sciences, University of California San Francisco, USA Zachary A. Kwena --- Kenya Medical Research Institute, Kenya -
Fish community dynamics of seasonal rivers of the Incomati Basin, Kruger National Park, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Kaiser-Reichel --- School of Biology and Environmental Sciences, University of Mpumalanga, South Africa GC O’Brien --- Gulbali Institute, Charles Sturt University, Australia R Petersen --- Garden Route National Park, South Africa National Parks, South Africa TW Khoza --- School of Biology and Environmental Sciences, University of Mpumalanga, South Africa A Van der Merwe --- School of Biology and Environmental Sciences, University of Mpumalanga, South Africa E Riddell --- Kruger National Park, South Africa National Parks, South Africa N Smit --- Unit for Environmental Sciences and Management, North-West University, South Africa T Dalu --- School of Biology and Environmental Sciences, University of Mpumalanga, South AfricaSeasonal rivers play a critical role in shaping aquatic ecosystems and provide essential ecosystem services in freshwater systems. Due to a limited understanding of seasonal rivers and how ecological indicators such as fish communities are structured, it is important to... -
Assessing instream structures to evaluate river connectivity of urban streams in the city of Pietermaritzburg, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Nolwazi B Ngcobo --- University of KwaZulu-Natal, South Africa Matthew J Burnett --- University of KwaZulu-Natal, South Africa Céline C Hanzen --- University of KwaZulu-Natal, South Africa Colleen T Downs --- University of KwaZulu-Natal, South AfricaArtificial barriers in freshwater ecosystems may hinder fish movement by altering their habitat and fragmenting rivers. We assessed the impact of anthropogenic structures on river connectivity in Pietermaritzburg, KwaZulu-Natal, South Africa. We mapped the barriers on eight watercourses using the... -
Body condition metrics and reproductive aspects of three spiny eels (Teleostei: Mastacembelidae) from littoral habitats in southern Lake Tanganyika
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Mabo --- Department of Agriculture and Aquatic Sciences, Kapasa Makasa University, Zambia APH Bose --- Department of Wildlife, Fish & Environmental Studies, Swedish University of Agricultural Sciences, Sweden B Mutale --- Department of Agriculture and Aquatic Sciences, Kapasa Makasa University, Zambia LH Haambiya --- Nsumbu Tanganyika Conservation Programme, Frankfurt Zoological Society, Zambia K Kunda --- Lake Tanganyika Research Unit, Department of Fisheries, ZambiaThe body condition metrics and reproductive aspects of three spiny eel species (Mastacembelus moorii, M. ellipsifer and M. cunningtoni) inhabiting littoral habitats in southern Lake Tanganyika were evaluated. As Mastacembelids are important in artisanal fisheries, the study aimed to provide... -
Comparative study of the occurrence and distribution of parasites in pond and cage-cultured Nile tilapia (Oreochromis niloticus) in the Lake Victoria Crescent, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AN Luttamaguzi --- , Uganda JJ Kisakye --- Makerere University, Uganda T Mudumba --- CAB International, Kenya C Agoe --- National Fisheries Resources Research Institute, National Agricultural Research Organization, Uganda M Sserwadda --- Mountains of the Moon University, Uganda JK Walakira --- National Fisheries Resources Research Institute, National Agricultural Research Organization, UgandaDespite ongoing biosecurity and control efforts, aquaculture intensification in the Lake Victoria Crescent has led to a persistent increase in parasitic disease occurrence in cultured Nile tilapia. Notably, different culture systems provide different habitats and environmental conditions for parasites and...
