Data/hora: 03/06/2024 02:11:41

Provedor de dados: | Ocean Docs: e-repository of  publications
País: | Belgium
Título: | Observations on the fisheries, growth and mortality rate of Oreochromis niloticus (tilapia) in the Nyanza Gulf of Lake Victoria
Autores: | Dache, S.
Data: | 2006-03-09
Ano: | 1994
Palavras-chave: | Oreochromis niloticus; Rastrineobola argentea; Lates niloticus Fishery management Growth Lake fisheries Landing statistics Mortality Fishery management Growth Lake fisheries Mortality http://aims.fao.org/aos/agrovoc/c_24026 http://aims.fao.org/aos/agrovoc/c_3394 http://aims.fao.org/aos/agrovoc/c_4159 http://aims.fao.org/aos/agrovoc/c_4945.
Resumo: | Oreochromis niloticus forms the third most important commercial     fishery in Lake Victoria after Lates niloticus and Rastrineobola     argentea. Because of its commercial importance as a cheap source of     animal protein, a study of its landing trends, growth and mortality     rates was conducted to assess the state of its stock in the lake and     recommend guidelines for its exploitation and management. To arrive at     the trends, landing data between 1976 and 1989 were analysed. For the     estimation of the growth and mortality rates, length frequency data     were collected from trawl surveys conducted fortnight between     Sseptember, 1989 and August, 1990 in the Nyanza Gulf. The results show     increased landings during the study period, with a higher percentage     landed in the open waters of the lake. The length-frequency results     show that O. niloticus is a slow growing fish which attains a great     asymptotic length of 61.3 cm, a growth constant K of 0.35 yr super(-1)     and a high growth performance index phi of 3.12. The total, natural     and fishing mortality rates were estimated at 1.71 yr super(-1) and     0.72, 0.99 yr super(-1) respectively. It is concluded from these     studies that O. niloticus has a high growth performance index     attaining larger sizes and if well managed, its fishery may flourish     and sustain the protein supply to the people living around the lake.
Tipo: | Proceedings Paper
Idioma: | Inglês

Identificador:

Okemwa, E; Wakwabi, EO; Getabu, A  (Ed.) Proceedings of the Second EEC Regional Seminar on Recent Trends of Research on Lake Victoria Fisheries, Nairobi : ICIPE SCIENCE, p. 59-65

9290640789

http://hdl.handle.net/1834/1152

Editor: | ICIPE SCIENCE

Formato:

323306 bytes

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