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Species of Tilapia (Pisces, Cichlidae) in Lake Kitangiri, Tanzania, East Africa
Author(s) -
Trewavas Ethelwynn,
Fryer Geoffrey
Publication year - 1965
Publication title -
proceedings of the zoological society of london
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0370-2774
DOI - 10.1111/j.1469-7998.1965.tb01880.x
Subject(s) - meristics , tanzania , rift valley , table (database) , fish <actinopterygii> , tilapia , fishery , east african rift , geography , rift , ecology , biology , paleontology , environmental planning , computer science , data mining , structural basin
Seven of a sample of 11 specimens of Tilapia from Lake Kitangiri in the eastern Rift Valley of Tanzania are shown to belong to T. amphimelas Hilgendorf and T. esculenta Graham. The other four are intermediate in structure and are interpreted as the result of hybridization. From this it is deduced that at least one of the species must have reached the lake recently, probably through the agency of man. A table of comparison of proportions and meristic characters in the two species and the intermediates is given, and in a postscript this is used as a basis for identifying specimens from Lakes Singida and Eyasi, the former of which is known to have been stocked. Summary Seven of a sample of eleven specimens of Tilapia from Lake Kitangiri in the eastern Rift Valley of Tanzania (Tanganyika) are shown to belong to T. amphimelas Hilgendorf and T. esculenta Graham. The other four are intermediate in structure and are interpreted as the result of hybridization. From this it is deduced that at least one of the species must have reached the lake recently, probably through the agency of man.