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Please use this identifier to cite or link to this item: http://hdl.handle.net/1834/1175

Title: Mortality rate, exploitation and recruitment in Oreochromis niloticus (Linnaeus) in Nyanza Gulf of Lake Victoria, Kenya
Authors: Getabu, A.
ASFA Terms: Exploitation
Fishery management
Lake fisheries
Issue Date: 1994
Citation: Okemwa, E.; Wakwabi, E.O.; Getabu, A . (Ed.) Proceedings of the Second EEC Regional Seminar on Recent Trends of Research on Lake Victoria Fisheries, Nairobi : ICIPE Science Press, p. 43-52
Abstract: An analysis was done on length frequency data to study mortality, exploitation rate and recruitment in Oreochromis niloticus in Nyanza Gulf, Lake Victoria. The fishing mortality (F) and natural mortality (M) were 0.468 y super(-1) and 2.0 y super(-1) respectively. The exploitation rate was 57.2%. Yield per recruit under the fishing regime was 250 g. Its predicted value at maximum sustained yield was 530 g, which could be obtained at a fishing mortality of 1.5 y super(-1). The recommended value was 500 g to be obtained at a fishing mortality of 1.0 y super(-1). The maximum biomass per recruit (B/R) was 1132.48 g while the optimum was 1068.38 g. The biomass recruit under the present fishing regime is 534.19 g which is too low. There is severe overfishing as there are a lot of immature fish in the catch. The analysis shows that the yield can double if the recommended mesh size is adopted in the fishery.
URI: http://hdl.handle.net/1834/1175
ISBN: 9290640789
Appears in Collections:Conference Papers

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