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¹ Erzincan University, Tercan Vocational School, Department of Fisheries and Aquaculture, 24800, Tercan, Erzincan, Turkey
² Atatürk University, Faculty of Fisheries, Department of Aquaculture, 25240, Erzurum, Turkey DOI : 10.4194/1303-2712-v12_3_14 Viewed : 4243 - Downloaded : 3801 A six-week feeding trial was conducted to investigate the suitability of animal oils as total replacement for cod liver oil (CO) in rainbow trout juvenile feeds. Four experimental diets were formulated: CO, goose fat, sheep tail fat and beef tallow. The final weights of fish were not significantly different among dietary treatments. Survival rate recorded during the experimental period was 100 % for all treatment groups. Highly significant relationships between oil source and whole body fatty acid composition were determined in all treatment groups. The preliminary saturated fatty acid and monounsaturated fatty acid were 16:0 and 18:1 n-9, respectively. The CO diet contained highest levels of total n-3 polyunsaturated fatty acid, especially eicosapentaenoic acid and docosahexaenoic acid. The n-3/n-6 ratio of in fish fed CO diet was also quite higher compared to that in fish fed the other diets. In conclusion, the results of this study show that total substitution of fish oil with animal fats impairs nutritional value of the fatty acid composition of rainbow trout juveniles. Keywords : Fish oil replacement, sheep tail fat, beef tallow, goose fat, unsaturated fatty acids