Table 1: Chronological introductions and status of fish species of Lake Naivasha, Kenya [13].

English name Scientific name Introduction date Current status
Black lampeye Aplocheilichthys antinorii (Vinciguerra, 1883) Last reported in 1962 Endemic: Probably extinct by M. salmoides predation
Straight fin barb Enteromius paludinosus (Peters,1852), Synonym Barbus paludinosus Came through in-flowing rivers recorded since 1982 Currently occasionally caught
Guppy Poecilia reticulata (Peters, 1859) Date unknown Recorded since 1982
Currently occasionally caught
Black bass Micropterus salmoides (Lacépède, 1802) 1929 as sport fishery, re-introduced in 1946/1951 Found today
Sabaki tilapia Oreochromis spirulus niger (Günther, 1894) 1925 Last caught1971
Redbelly Coptodon zillii (Gervais, 1884) previous known as Tilapia zillii 1959 Found today
Blue-spotted tilapia Oreochromis leucostictus (Trewevas, 1933) 1959 unintentionally with T. zillii Found today
Blue-spotted tilapia/ Sabaki tilapia O. leucostictus x O.s. niger hybrid Plentiful in 1960s Last caught in 1972: lost due back crossing with O. leucostictus
Nile tilapia Oreochromis niloticus L. 1967. Vanished by 1971, probably due to young predation by bass. Re-introduced in 2011. Currently present
Mosquito fish Gambusia sp. Date unknown Absent since 1977
Rainbow trout Oncorhyncus mykiss (Walbaum, 1792) Date unknown. Came through River Malewa from fish farms Occasionally caught
Common carp Cyprinus carpio L., sub species mirror carp C. carpio specularis and leather carp, C. carpio coiaceus Recorded in 2001. Accidental introduction through inflowing rivers from fish farms Found today
African catfish Clarias gariepinus (Burchell, 1822) Accidental introduction: escaped from fish farms into inflow rivers. First recorded in 2012. Currently present
Louisiana crayfish Procambarus clarkii (Girard, 1852) Introduced in 1950s. to provide food for Bass Currently present

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