Dominance of introduced Nile tilapia, Oreochromis niloticus (L.) in Lake Victoria: A case of changing biology and ecosystem
Okeyo Owuor, J.B.
Ministry of Water and Irrigation, Nairobi (Kenya)
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Nile tilapia, Oreochromis niloticus together with other tilapiines of Oreochromis leucosticus, Tilapia zillii and Sarotherodon melanopleudra (=T. rendalii) were introduced into Lake Victoria (Kenya) between 1951 and 1962 to boost the then declining fishery. Only O. niloticus was able to establish leading further to reduction in endemic tilapiines of Oreochromis variabilis and Oreochromis esculentus. O. niloticus currently forms the third commercially important species after introduced Nile perch, Lates niloticus and a native cyprinid Rastrineobola argentea, whereas other tilapias are extinct or are occasionally caught in the lake. Information was collected from by bottom trawling and from published literature to ascertain possible factors leading to dominance of O. niloticus. Compared to other tilapiines, Nile tilapia is widely distributed, feeds on a variety of food items, grows to larger sizes, is highly fecund and can survive in a wide range of physical chemical parameters in the la.....
JournalProceedings of the 11th World Lakes Conference - Volume 2
Spatial CoverageKenya, Victoria L.
Conference Name11th World Lakes Conference
Conference PlaceNairobi (Kenya)
CitationOdada, Eric (Ed.) Proceedings of the 11th World Lakes Conference: vol. 2. p. 255-262
- Conference Papers