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Journal of Fisheries and Aquatic Science

Year: 2006 | Volume: 1 | Issue: 2 | Page No.: 117-125
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Authors

Hany I. El-Marakby

Keywords

Research Article

Effect of Dietary Sources and Levels of Lipids onGrowth Performance and Feed Utilization of Fry Nile Tilapia, Oreochromis niloticus (L.) (Teleostei: Perciformes)

Hany I. El-Marakby
The effect of dietary oil sources and levels on growth, feed utilization, and body chemical composition of fry Nile tilapia (Oreochromis niloticus) (Teleostei: perciformes) was studied through two experiments. In the first experiment, Nile tilapia (2±1 g/fish) were assigned to three treatments, with three replicates each. The test diets (CP 30%) contained cod liver oil, corn oil or mixed oil of corn and cod liver oils (1:1 v/v) at 4% level. Fish were fed test diets at the rate of 3% of live body weight three times daily for 90 days. The results revealed that the diet contained mixed oil resulted in the highest fish growth. No significant changes in feed intake, FCR, PER or PPV were observed due to different oil sources in diet. The highest water and protein contents were found in the body of fish fed mixed oil diet and no changes were observed in total lipids and ash contents in fish fed different diets. The second experiment was carried out to test the optimum oil level in fish diet. Fish were fed diets containing dietary oil level of 0 (control), 2, 4, 6 or 8%. The results revealed that the optimum fish growth was found at dietary level of 4%. Also, the optimum feed intake, FCR, PER or PPV were realized by the diet with mixed oil at 4%. The crude protein content in the body of fish significantly (p<0.05) decreased at 6-8% oil level. No significant changes in total lipid and ash content were observed, but ash content in fish fed control diet was the highest. It could be concluded from the present study that it is possible to substitute 50% of the fish oil in diets for Nile tilapia fry with corn oil, without affecting the growth performance and feed utilization and the optimal dietary lipid level for Nile tilapia fry is 4%.
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