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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. Hampton

Orange 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...

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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. Hampton

This 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...

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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. Branch

Orange 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...

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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. Whittington

The 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,...

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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. Sowman

This 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...

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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. Dye

Evolution 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,...

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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. Maseko

Following 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...

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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. Beaumont

Subsistence 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...

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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. Russell

The 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...

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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 Africa

Lake 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...

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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 Kingdom

The 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.

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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 --- , Namibia

The 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...

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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...

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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 Seti

There 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...

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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 Radebe

A 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...

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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 Taylor

The 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...

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Limnology of southern African coastal lakes — new vistas from Mozambique

Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RobC Hart Custodio Boane

Fourteen 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...

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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 Kapirika

This 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...

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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 Philippart

Artisanal 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...

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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 Africa

Between 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...

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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 Africa

With 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...

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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, Uganda

The 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...

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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, Uganda

Climate 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...

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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, UK

The 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...

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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, USA

The 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,...

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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. Bannister

Case 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...

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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. Turpie

Existing 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...

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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. Fréon

A 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...

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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. Tarr

The 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...

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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. Field

In 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...

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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. Plagányi

Aspects 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...

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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. Moloney

A "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...

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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. Shannon

The 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...

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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. Griffiths

Within 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,...

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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. Crawford

In 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...

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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. Butterworth

Ecosystem-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...

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Review of indicators in fisheries management – a development perspective

Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P. Degnbol A. Jarre

A 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...

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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 Meer

Cold-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...

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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 Hutchings

South 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...

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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 Wood

A 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...

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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 Vanderpuye

Many 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...

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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, Canada

The 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...

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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 Africa

The 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...

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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, UK

The 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...

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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 Africa

This 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...

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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 Africa

This 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...

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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 Africa

The 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...

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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 Africa

The 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...

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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 Africa

The 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...

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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, Italy

The 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...

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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 Africa

The 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...

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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 --- , Spain

During 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...

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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), UK

Lichia 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...

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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 Africa

The 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...

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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 Africa

In 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...

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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 Africa

The 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...

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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 --- , Norway

Sharks 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...

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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 --- , USA

The 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...

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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 --- , Senegal

Despite 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...

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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 Africa

Management 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...

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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 Oswe

Lake 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...

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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 Thorstad

Movements 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...

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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 Yamaoka

The 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...

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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 Tol

The 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...

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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 Mgaya

An 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...

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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 Boutiba

This 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...

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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 Weyl

Rapid 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,...

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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 Africa

Although 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...

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Estimating the unreported catch of Eritrean Red Sea fisheries

Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Tesfamichael TJ Pitcher

Unreported 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...

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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 Cowley

In 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...

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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 Augustyn

The 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,...

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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 Payne

Sustainability 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...

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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 Elst

The 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...

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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 Sauer

The 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...

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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 Næsje

The 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...

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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 Plagányi

The 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...

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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 Winker

An 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...

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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 Lamberth

Ancient 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...

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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 Africa

Standardised 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...

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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 Africa

Dyer 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...

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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 Africa

Studies 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...

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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, Uganda

The 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...

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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 Africa

There 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...

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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), Norway

Fifteen 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...

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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 Africa

Ten 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...

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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 Africa

Specimens 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...

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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 Africa

Ecosystem-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...

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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 Africa

Chondrichthyans (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...

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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, Indonesia

Indonesian 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...

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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 Africa

Understanding 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...

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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 Africa

Molecular 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...

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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, USA

Measuring 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...

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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), Spain

Fish 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...

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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 Africa

Photo-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...

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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 Africa

The 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...

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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 Africa

The 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...

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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, Kenya

Morphometric 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...

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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, Iceland

The 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...

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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, Benin

Growth, 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...

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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 Africa

The 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...

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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, Tunisia

To 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...

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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 Africa

White 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...

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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, Tunisia

The 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...

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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, Ghana

Fishery 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...

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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, Wales

Accurate 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...

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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 Africa

Management 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...

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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), Senegal

Despite 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...

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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, Ethiopia

Lake 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...

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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 Africa

The 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...

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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 Africa

The 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...

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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 Africa

Fisheries 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...

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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 Africa

The 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...

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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, Australia

Climate 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...

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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), Denmark

There 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...

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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, Angola

Most 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...

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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, Namibia

In 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...

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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 Africa

This 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...

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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 Africa

Bottom-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...

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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], Portugal

Small 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...

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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 Africa

Restoration 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...

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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 Kingdom

Non-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...

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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 Africa

Catch-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...

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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 Africa

To 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...

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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 Africa

The 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...

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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 Africa

Catch 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...

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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 Africa

Managing 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...

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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 Africa

The 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...

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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 Kingdom

South 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...

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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 --- , Kenya

Gillnets 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...

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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 Africa

Cape 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...

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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 --- , Tanzania

The 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...

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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 Africa

The 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...

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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 Africa

The 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...

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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 --- , Madagascar

The 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...

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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 Africa

This 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...

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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, Namibia

Namibia'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...

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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 Africa

South 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...

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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 Africa

A 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...

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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 Africa

This 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...

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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 Africa

Despite 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...

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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 Africa

The 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...

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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 Africa

Oceanographic 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...

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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, Zambia

The 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...

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