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|Title:||Habitat Characteristics, Feeding habits and Food Preferences by a Tilapine Fish, Oreochromis niloticus baringoenisis, (Trewavas 1983) in Turbidity - Stressed sites of Lake Baringo|
|Keywords:||Habitat Characteristics -- Feeding habits -- Food Preferences -- Tilapine Fish -- Oreochromis niloticus baringoenisis (Trewavas 1983) -- Turbidity|
|Abstract:||This study was carried out to determine water physico-chemical variables, biometrics, condition, food preferences and feeding habits of Oreochromis niloticus baringoensis in Lake Baringo, Kenya from December 2000 to May 2001. The turbidity ranged from 58.0-1327.9 NTU, temperature from 21.2-333° C whilst conductivity ranged from 22105920 (18/cm. The condition of the fish ranged from 1.4 to 2.5. The dorsal and anal fin formulas were, DXVl, 12 and Alll, 9, respectively. The major components in the pelagic zone were zooplankton 3.6% and phytoplankton 96.3%. Microcystis and Nitzschia sp. contributed 41.3% and 35.5%, respectively, while Mesocyc/ops sp., the most abundant zooplankton, contributed 1.3% of all the zooplankton. ln the._gut, zooplankton contributed 9% and phytoplankton 54.4%. In addition, detritus material contributed 22%, higher plant remains 12% and insect remains, 2%. The major components of the benthos were Diptera (1%), Molluscs (80%), Hemiptera, (18%), Plecoptera (0.9%) and Hirudinea (0.2%). Since there was no commonality between the benthos and the gut contents, pelagic zone was taken as the major contributor to the diet of Oreochromis niloticus baringoensis. The fish rejected about 66% of the possible food items, indicating a high degree of selectivity. The major issue that emerged in this study is that turbidity, exacerbated by the anthropogenic activities in the lake catchment, has a profound effect on the diversity of the live food items of the Oreochromis ni/oticus baringoensis fish in Lake Baringo. With increased turbidity and catchment activities, the fish may encounter inadequate food supply leading to low fish productivity. The riparian communities, which depend on the lake water resources, will eventually have insufficient protein resources. Therefore there is need to control turbidity levels in Lake Baringo through proper management of the catchment resources.|
|Appears in Collections:||Faculty of Environment and Resource Development|
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