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¹ Çukurova University, Faculty of Fisheries, Department of Aquaculture, 01330, Adana, Turkey
² Deakin University, School of Life and Environmental Sciences, P.O. Box 423, Warrnambool, Victoria 3280, Australia
³ Mersin University, Faculty of Fisheries, Department of Aquaculture, Yenişehir Campus, Mersin, Turkey
⁴ Tunceli University, Faculty of Fisheries, Department of Aquaculture, 62000 Tunceli, Turkey DOI : 10.4194/1303-2712-v12_4_07 Viewed : 4222 - Downloaded : 3341 Triplicate groups of 20 European sea bass (35 g) were fed five diets in which the added lipid was 100% fish oil (FO), 40% (CSO40), 60% (CSO60), 80% (CSO80) and 100% (CSO100) refined cottonseed oil (CSO), for a period of 120 days. Overall fish growth, feed conversion ratio and protein utilization were unaffected by dietary treatment, but hepatosomatic and visceral fat indexes increased with increasing dietary CSO. Fillet fatty acid composition of total lipids reflected the fatty acids in the test diets. The monounsaturated fatty acids were significantly higher in fillet of fish fed diet FO, CSO40 and CSO60 compared to other treatments while saturated and polyunsaturated fatty acids (PUFA) were not affected by the dietary treatment. Some fatty acids (18:0, 18:1n-9, 20:5n-3 and 22:6n-3) were present in higher concentration in fillet lipid than in the CSO100 dietary lipid indicating accumulation in fillet relative to test diets. Retention of n-3 LC-PUFA within the fillet was increasingly inefficient among fish fed increasing levels of FO. Thus, this study suggests that CSO can be considered as a relatively effective substitute for fish oil in European sea bass (35 g) in terms of growth performances and feed efficiency as far as fish meal is present in the diet. Keywords : Dicentrarchus labrax, linoleic acid, fish oil replacement, aquafeed, vegetable oils