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¹ Istanbul University, Fisheries Faculty, Department of Aquaculture, Ordu Cad. No:200, 34470, Laleli, Istanbul, Turkey
² Cukurova University, Fisheries Faculty, Department of Aquaculture, 01330, Balcalı, Adana, Turkey
³ Mersin University, Fisheries Faculty, Department of Aquaculture, 33169, Yenişehir Kampüsü, Mersin, Turkey
⁴ Istanbul University, Faculty of Veterinary Sciences, Department of Pathology, 34320, Avcılar, Istanbul, Turkey
⁵ Istanbul University, Fisheries Faculty, Sapanca Inland Waters Research Center, Kurtköy, Sapanca, Adapazari, Turkey DOI : 10.4194/1303-2712-v13_3_08 Viewed : 5029 - Downloaded : 3956 This study aimed at demonstrating the effects of total and 50% dietary fish oil replacement by cotton seed and canola oils and a mixture of these vegetable oils (VOs) on growth, tissue fatty acid composition and histology of digestive organs in the juvenile rainbow trout for 84 days. Five iso-nitrogenous and lipidic diets were formulated to replace dietary fish oil (FO) totally by cotton seed oil (CSO), canola oil (CO) and an equal or 50% FO/ 50% VO mixture. Duplicate groups of 50 fish (~15 g) were fed two times daily to apparent satiation. Growth performance, feed efficiency and viscerosomatic index were not influenced by dietary treatments (P>0.05). However, hepatosomatic index was significantly higher (P<0.05) in fish fed with CSO and CSO50/CO50 diets. Fish fed CSO or CO diets had significantly lower levels of n-3 highly unsaturated FAs and increased levels of 18:2n-6 in the whole body FA composition (P<0.05). Furthermore, liver had significantly higher levels of docosahexaenoic acid and arachidonic acid than those in the fish whole body. Results suggest that the 50% replacement of dietary fish oil by cotton seed oil and canola oils in equal amounts could be possible without compromising growth and overall well-being in the juvenile rainbow trout. Keywords : Rainbow trout, nutrition, vegetable oils, FAs, growth