Distribution and association of Tilapine unit stocks in the Lake Victoria catchment (Kenya)
Okeyo Owuor, J.B.
Ministry of Water and Irrigation, Nairobi (Kenya)
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The Lake Victoria Catchment (Kenya) harbours six species of tilapia. Two species Oreochromis variabilis (L) and Oreochromis esculentus (L) are endemic while four species Oreochromis niloticus, Oreochromis leucostictus, Tilapia zillii(Gervais) and Tilapia rendalli(Gervais) were variously introduced in 1950s and early 1960s. The existence of six tilapia species in the same geographical range has had significant ecological and economical implications. The study investigated the ecological impacts by determining species diversity, distribution, association (allopatric, sympatric and parapatric) and habitat preferences for the six-tilapia species. Shannon-wiener index was used to determine diversity, while species distribution was evaluated on the basis of 39 habitats (dams and satellite lakes) within the catchment. Species associations were determined using Cole’s Cab index. The Shannon Weiner function values of 2.44-2.7 indicate relatively high species diversity in 15% of 33 habitats wher.....
JournalProceedings of the 11th World Lakes Conference - Volume 2
Spatial CoverageKenya, Victoria L.
Conference Name11th World Lakes Conference
Conference PlaceNairobi (Kenya)
CitationOdada, Eric & Olago, Daniel O. (Ed.) Proceedings of the 11th World Lakes Conference: vol. 2. p. 210-216
- Conference Papers