Journal article
Status of the estuarine-dependent riverbream Acanthopagrus berda (Sparidae) harvested by the multi-sectoral fishery in Kosi Bay, South Africa
African Journal of Marine Science, Vol.30(1), pp.45-53
2008
Abstract
A stock assessment was undertaken for the tropical sparid Acanthopagrus berda harvested in the Kosi Bay estuarine system, northern KwaZulu-Natal, South Africa, by a multi-sectoral fishery using traditional traps and gillnets, and recreational angling using rod-and-line. Input parameters used in a catch curve analysis included age and growth parameters, and an estimate of natural mortality derived from life-history parameters. The values of spawner biomass-per-recruit estimated from this model, using different selectivity curves for the gear types used in the different fishing sectors, indicate that A. berda is likely to be reduced to around 24% of its unfished level of spawner biomassper-recruit by current levels of fishing mortality. These results indicate that A. berda in Kosi Bay is heavily overexploited. The longevity of the species, coupled with its late maturation, sex change and estuarine dependency, and the increasing catches of A. berda give cause for concern for the continued sustainable use of this species in northern KwaZulu-Natal.
Details
- Title
- Status of the estuarine-dependent riverbream Acanthopagrus berda (Sparidae) harvested by the multi-sectoral fishery in Kosi Bay, South Africa
- Authors/Creators
- N. James (Author/Creator) - South African Environmental Observation NetworkN.G. Hall (Author/Creator) - Murdoch UniversityL.E. Beckley (Author/Creator) - Murdoch UniversityB.Q. Mann (Author/Creator) - Oceanographic Research Institute, PO Box 10712, Marine Parade 4056, South AfricaW.D. Robertson (Author/Creator) - Oceanographic Research Institute, PO Box 10712, Marine Parade 4056, South Africa
- Publication Details
- African Journal of Marine Science, Vol.30(1), pp.45-53
- Publisher
- National Inquiry Services Centre Ltd.
- Identifiers
- 991005544127107891
- Copyright
- © NISC Pty Ltd.
- Murdoch Affiliation
- School of Environmental Science
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.2 Marine Biology
- 3.2.92 Fisheries Ecology
- Web Of Science research areas
- Marine & Freshwater Biology
- ESI research areas
- Plant & Animal Science