Taxonomy, common names and distribution of fish in the eastern arm of the Rift Valley drainage, Kenya. Item Type Report Section Authors Okeyo, D.O. Publisher European Commission Download date 27/09/2021 13:17:28 Link to Item http://hdl.handle.net/1834/7187 Status of fish common names in the Rift Valley drainage, Kenya D.O. Okeyo TAXONOMY, COMMON NAMES AND DISTRIBUTION OF FISH IN THE EASTERN ARM OF THE RIFT VALLEY DRAINAGE, KENYA TAXINOMIE, NOMS COMMUNS ET DIS TRIBUTION DES POISSO NS DU BASSIN ORIENTALE DE LA RIFT VALLEY, KENYA Daniel O. Okeyo Faculty of Science and Technology, University of Fort Hare, Private Bag X1314, Alice 5700, Eastern Cape, Republic of South Africa; Email:
[email protected] ABSTRACT This paper attempts to update information on scientific and recommended English common names and the distribution of fish species of Kenya occurring in the Eastern Arm of the Rift Valley drainage system. At least 20 fish families from 35 genera and 66 species occur in the drainage system, with Lake Turkana catchment having the richest species diversity at 50 (76 %). Five (8 %) fish species have been introduced into the drainage, mostly for commercial purposes and sports, viz: in Lake Naivasha, largemouth bass, Micropterus salmoides; blue spotted tilapia, Oreochromis leucostictus; Athi River tilapia, Oreochromis spilurus niger; Zill’s tilapia, Tilapia zillii; and in Lake Nakuru, a species tolerant to high salinities, the Lake Magadi tilapia, Oreochromis alcalicus grahami. These introductions may have caused, e.g., the extinction of the Naivasha lampeye, Aplocheilichthys sp. from Lake Naivasha. Most fishes occurring in the drainage are at times capable of living in both lacustrine as well as riverine conditions, except three (5 %), which tend to be entirely riverine.