An assessment of the purse-seine (winch-net) fishery in Lake Volta, Ghana

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dc.contributor.author Ofori-Danson, P.K.
dc.date.accessioned 2019-03-20T11:24:57Z
dc.date.available 2019-03-20T11:24:57Z
dc.date.issued 2005-09
dc.identifier.other https://doi.org/10.1111/j.1440-1770.2005.00274.x
dc.identifier.other Volume 10, Issue 3, Pages 191-197
dc.identifier.uri http://ugspace.ug.edu.gh/handle/123456789/28733
dc.description.abstract An assessment has been made of the stock conditions of five major component fishery species (Chrysichthys nigrodigitatus, Chrysichthys auratus, Hemisynodontis membranaceus, Oreochromis niloticus and Schilbe intermedius) exploited with illegal purse-seine (winch-net) gear in the Yeji sector of Lake Volta, Ghana. Chrysichthys nigrodigitatus was clearly found to be overexploited, but the others were being exploited near to, or under, optimum harvest levels. All five species were harvested at an inappropriate age-at-first-capture of ≈ 6 months, suggesting overfishing of young fishes. Consequently, the computed Lm:L∞ ratios were > 0.64. For most fish species, such a ratio implies their exploitation when at early maturity and at very small sizes. The estimated range of mesh sizes in the cod-ends was far lower (5-8 mm) than the legal mesh size of 25 mm, calling for urgent enforcement of rules and regulations. Single-species yield-per-recruit analyses indicated that yields could be improved by the reduction in the current fishing effort. As the fishery of the lake is not segmented to allow fish to be taken by the illegal small-mesh purse seines, studies on the interactions between the different fishery sectors need to be undertaken, alongside the proposed ban of the gear as enshrined in the Fisheries Law of Ghana. © 2005 Blackwell Publishing Asia Pty Ltd. en_US
dc.language.iso en en_US
dc.publisher Lakes and Reservoirs: Research and Management en_US
dc.subject Growth en_US
dc.subject Lake volta en_US
dc.subject Mortality en_US
dc.subject Parameter en_US
dc.subject Yield-per-recruit en_US
dc.title An assessment of the purse-seine (winch-net) fishery in Lake Volta, Ghana en_US
dc.type Article en_US


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