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Turkish Journal of Fisheries and Aquatic Sciences 2003, Vol 3, Num, 2     (Pages: 111-116)
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Effect of the Different Oil on Growth Performance and Body Composition of Rainbow Trout (Oncorhynchus mykiss W., 1792) Juveniles

Erdal Şener 1 ,Mustafa Yıldız 1

1 Istanbul University, Faculty of Fisheries, Department of Aquaculture and Fish Disease, 34470 Laleli-Istanbul, Turkey Viewed : 4644 - Downloaded : 3841 Fish oil is the main lipid for energy and essential fatty acid source in commercial fish feeds. The steady production and rising price of fish oil encourage the inclusion of vegetable oils in fish feeds. In order to evaluate the effect of the vegetable oil on growth performance and whole body composition of rainbow trout was researched in this study. Weight gain, feed conversion ratio, specific growth rate, whole body composition and amount of fatty acids of rainbow trout fed the feeds included fish oil; soybean oil and sunflower oil were studied.

Rainbow trout juveniles having approximate initial weight of 5.78±0.09 g were fed by experimental feeds included different kinds of oil during 60 days. As a result of the experiment, weight gain of the fish were found 29.3±0.4 g in the fish oil group, 28.1±0.4 g in the sunflower oil group and 28.8±0.6 g in the soybean oil group. Feed conversion ratios were found 1.05, 1.12 and 1.08 respectively. The fish was fed by a commercial trout feed added different kind of oils with a ratio of 10% and containing approximately 43.5% crude protein, 14.0% crude lipid. At the end of the feeding trials, whole body fat contents were found 6.1% in the fish oil group, 5.3% in the sunflower group and 5.9% in the soybean oil group. There is no big difference among the groups regarding to lipid accumulation in the liver.

Naturally in the groups fed the feeds included vegetable oil, the ratio of n-6 fatty acids were higher than the control group and in the group fed fish oil (control group), n-3 fatty acids ratio were higher than the others. As a result, it is possible to use certain amount of soybean oil and sunflower oil as substitute fish oil in the rainbow trout diets. Keywords : Trout nutrition, dietary lipids, fatty acid composition