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Lake Naivasha has been a habitat for single fish species, the endemic Aplocheilichthys antinori, which was last recorded in 1962 (Elder et al., 1971). Since 1925, various fish introductions have been made, with varying success histories (Litterick et al., 1979; Muchiri and Hickley, 1991). Today, a wider variety of fish species including Oreochromis niloticus, Oreochromis leucostictus, Tilapia zillii, Micropterus salmoides (large mouth black bass) Cyprinus carpio (common carp),Procambarus clarkii (Crayfish) and Mirror carp,longfin barbBarbus paludinosus (Boulenger) coexist in the lake (Elder et al., 1971; Siddiqui