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Journal of Fisheries and Aquatic Science

Year: 2007 | Volume: 2 | Issue: 2 | Page No.: 140-148
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Authors

Fayza E. Abbass

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Research Article

Effect of Dietary Oil Sources and Levels on Growth, Feed Utilization and Whole-Body Chemical Composition of Common Carp, Cyprinus carpio L. Fingerlings

Fayza E. Abbass
The effect of dietary oil sources and levels on growth, feed utilization and whole-body chemical composition of common carp (Cyprinus carpio L.) was studied. Fish (4-5 g) were randomly distributed at a rate of 15 fish/100 L aquarium and fed one of the tested diets for 90 days. The obtained results showed that different growth parameters were affected significantly by dietary lipid sources or lipid levels (p< 0.05), but not by their interaction (p>0.05). The fish growth was maximized when fed diets containing oil mixture (1:1 v/v corn oil : fish oil) more than that fed plant oil or fish oil alone. The fish groups fed fish oil exhibited better growth than that fed plant oil. Fish growth increased significantly due to the increase in dietary lipid levels and the maximum growth was obtained when fish fed a mixed oil diet with a level of 6%. Fish survival was not affected significantly due to the variation in lipid sources or lipid levels (p>0.05) and it ranged 98.3-100%. Feed utilization parameters were affected significantly by either lipid source, levels or their interaction (p< 0.05) except feed intake (FI), feed conversion ratio (FCR) and feed efficiency ratio (FER) were not affected by the interaction (p< 0.05). FI increased with mixed oil source better than the other oil sources. The feed intake was low and the FCR was high with fish group fed the control diet. The adding of oil mixture or fish oil to fish diet enhanced the FI, FCR and FER values to be better than that fed plant oil source or control diets. The optimum feed utilization was obtained with fish groups fed diets containing mixed oil at the level of 6%. Moisture, crude protein, total lipids and ash contents were affected significantly by oil level only (p< 0.05) and no significant changes were observed due to oil source or oil source-oil levels interaction (p>0.05). Moisture and crude protein contents decreased significantly, while total lipids increased significantly with the increase of oil level (p< 0.05) irrespective to oil source. It is concluded from this study that mixed oil (1:1 v/v corn oil : fish oil) should be added to the diet for common carp fingerlings at a level of 6% irrespective to the lipid content of the basal ingredients of the diet.
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