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This research aimed to evaluate the e¡ects of two dietary fat levels [low fat (LF) (10%), high fat (HF) (20%)] and sources [¢sh oil (FO), vegetable oil (VO)] on the growth and some physiological parameters of Caspian brown trout ¢ngerlings for 60 days. Tuna oil or blends of canola and soybean oils (85:15) were added to diets to design four feeds namely LFFO, HFFO, LFVO and HFVO according to the fat levels and sources. The ¢sh fed the LFFO diet had lower weight gain than the other ¢sh (Po0.05). The total n-6 fatty acids increased in ¢sh fed diets with the blends of VO, while the total n-3 fatty acids decreased in these ¢sh (Po0.05). Serum lysozyme activity was higher in ¢sh fed the HFVO diet than the other ¢sh (Po0.05). Serum glucose, total cholesterol, triglyceride and very low-density lipoprotein were lower in ¢sh fed LFFO than the other ¢sh (Po0.05). The present study demonstrates that in terms of ¢sh growth, VOs can be used as an alternate source of dietary fat, whereas ¢sh health and nutritional value are improved with the LFFO diet. According to these results, a partial substitution of FO by VO in high-level fat diets is suggested for long-term feeding of Caspian brown trout.

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