This study evaluated effects of diets containing different vegetable oil resources on growth performances, body compositions and fatty acid profile of Clarias gariepinus. The oils were incorporated at 7% level of the diet. Fingerlings were randomly stocked at 20 fish per floating net-hapa (1m 3) and fed the experimental diets for 12 weeks. Fatty acid methyl esters and proximate compositions were determined. Growth performances revealed that fish fed palm oil-based diets yielded best. Fatty acids profile revealed that lauric, myristic and palmitic acids were the main saturated fatty acids while oleic acid was the main monounsaturated fatty acids. High levels of docosahexaenoic acid (DHA) (22:6n-3) and arachidonic acid (ARA) (20:4n-6) were observed in muscle lipid of fish fed with sunflower oil diet. The main contributor of saturated fatty acids was lauric with the highest amount (82.57%) reflected in fish fed coconut oil diet. The highest (P<0.05) monounsaturated fatty acids (73.55%) was in fish fed olive oil diet. Proximate analysis revealed catfish belongs to high-protein (15-20%) and high-oil (>5%) category. The ω-3/ω-6 ratios obtained in muscle fatty acids of catfish fed olive, sunflower and sesame-oil diets were within the recommended daily intake of EPA and DHA for normal human health.

ABSTRACT:This study evaluated biochemical responses of Clarias gariepinus after replacing fish oil with plantbased oils in their diets. The sources of oils were coconut, olive, crude palm, sunflower and sesame seed. These oils were incorporated at 7% level to produce five isonitrogenous (41.03% protein) diets. The sixth diet contained fish oil and served as control experiment. Feeding trial was conducted in floating hapa (1m 3 ) system for 12 weeks. At harvest, blood samples were taken and examined for serum protein, albumin, globulin, electrolytes and tissue lipid peroxidation. Results showed that kidney function parameters (protein, albumin and globulin) increased significantly (p < 0.05) in palm oil treated group while the highest (p < 0.05) serum ions were observed in olive oil treated fish. The amount of malondialdehyde (MDA) formed in fish tissues also increased (p < 0.05) in palm oil group by 41%, 14%, 39% and 14 % in the liver, kidney, gill and heart respectively. However, no significant difference (p > 0.05) was observed in MDA formation in fish fed olive oil and control diets. Inferences from this study conclusively support the direct use of palm and olive oils as total replacement for fish oil in diets of Clarias gariepinus. ©JASEM http://dx.doi.org/10.4314/jasem.v20i4.20

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