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¹ Atatürk University, Faculty of Fisheries, Department of Aquaculture, 25240 Erzurum, Türkiye
² Atatürk University, Graduate School of Natural and Applied Sciences, Department of Aquacultural Engineering, 25240 Erzurum, Türkiye DOI : TRJFAS23350 Viewed : 783 - Downloaded : 841 The aim of the present study was to check if dietary hazelnut oil alleviates the negative effects of oxidized fish oil in rainbow trout juveniles. Dietary fresh and oxidized fish oils were totally or partially (40 and 60%) replaced in a 9-week feeding trial. Growth performance and feed efficiency were significantly influenced by oxidized fish oil (P<0.05), but not by hazelnut oil inclusion and their interaction. Fish fed fresh fish oil containing-diets had better growth and feed efficiency than those fed oxidized fish oilcontaining diets. Protein and lipid digestibility decreased with the increase in both dietary oxidized fish oil and hazelnut oil. Fatty acid profile in whole-body lipids was significantly influenced by the experimental diets (P<0.05). Polyunsaturated fatty acids (PUFA) showed a significant decrease with both dietary hazelnut and oxidized fish oils inclusion level. Dietary hazelnut oil resulted in a significant increase in hepatic vitamin E and a significant decrease in lipid peroxidation level (P<0.05). Our overall results suggested that dietary oxidized lipids caused growth depletion, lowered nutrient digestibility, lipid peroxidation, and decreased eicosapentaenoic acid (EPA; 20:5n-3) and docosahexaenoic (DHA; 22:6n-3) levels in rainbow trout. However, dietary hazelnut oil inclusion alleviated the negative effects of oxidized oil, sparing n-3 longchain PUFAs such as EPA and DHA, and increasing hepatic α-tocopherol levels which lowered lipid peroxidation despite no significant impact on growth. Keywords : Rainbow trout Oxidized fish oil Fatty acid profile Hazelnut oil Lipid peroxidation