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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... -
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... -
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,... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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,... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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%),... -
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... -
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... -
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,... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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,... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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,... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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... -
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...