Effect of Different Levels of Pigment Lutein in the Diet on Growth and Blood factors on Rainbow Trout (Oncorhynchus mykiss)

In this study, effect of feeding diets containing different amounts of pigment lutein, the amount of growth and blood factors of rainbow trout (Oncorhynchus mykiss) were investigated. This study for eight weeks, on 600 numbers of rainbow trout (average weight 93.02±0/64 g), in a control group and three treatments (each with three replicates) was performed. Fish fed three times daily with a commercial diet (GFT2) containing different amounts of lutein (0, 14, 16 and 20 mg/kg) was conducted. The results showed that the treatments studied had significant difference in weight and body length of fish (p<0.05), but no significant difference (p>0.05) in performance parameters of growth and food consumption including FCR, SGR, GR, BWI, CF followed by survival rate. Results of the blood sampling showed that WBC, RBC, lymphocytes, and IgM were significant differed between the treatments (p<0.05), but monocytes and neutrophils didn’t show significant difference between treatments (p>0.05).