Item Details

Title: Fish species and trophic diversity of haplochromine cichlids in the Kyoga satellite lakes (Uganda)

Date Published: 2004
Author/s: Dismas Mbabazi, R. Ogutu-Ohwayo, s. B. Wandera and Y. Kiziito
Data publication:
Funding Agency :
Copyright/patents/trade marks: African Journal of Ecology
Journal Publisher: African Journal of Ecology
Affiliation: [National Agricultural Research Organisation, Fisheries Resources Research Institute, Po. Box 343, linja, Uganda, 2LakeVictoria Fisheries Organization, Po. Box 1625, linja, Uganda and 3Zoo1ogy Department, Makerere University, P.O, Box 7062, Kampala,
Keywords: biodiversity, ecosystem, haplochromine, introductions, trophic groups


Prior to the 1980s, lakes Kyoga and Victoria previously supported an exceptionally diverse haplochromine fish fauna comprising at least 11 trophic groups, The species and trophic diversity in these lakes decreased when the introduced Nile perch depleted haplochromine stocks, From December 1996 to October 1998, we studied species and trophic diversity of haplochromine fishes in six satellite lakes without Nile perch in the Kyoga basin and compared them with the Kyoga main lake against historical data from Lake Victoria where Nile perch were introduced. Forty-one species were found in the study area, of which, the Kyoga satellite lakes contributed 37 species in comparison to only 14 from the Kyoga main lake. Analysis of trophic diversity based on 24 species that contained food material revealed seven haplochromine trophic groups (insectivores, peadophages, piscivores, algal eaters, higher plant eaters, molluscivores and detritivores) in the Kyoga satellite lakes in comparison to two trophic groups (insectivores and molluscivores) in the Kyoga main lake. Many of the species and trophic groups of haplochromines depleted by the introduced Nile perch in lakes Kyoga andVictoria still survive in the Kyoga satellite lakes. This is attributed to the absence of Nile perch in those lakes,