The effect of dietary Nanoselenium on growth indicators, Immune system and liver Enzymes of juvenile (Acipenser stellatus)

The effect of inclusion of Nanoselenium to the commercial diet on the growth indices, liver enzymes and immune system of juvenile Acipenser stellatus was investigated. Individual 120 juveniles with an average weight of 21.93±1.03 g were fed with diets A, B, C and D (containing 0.1, 0.2, 0.3 and no Nanoselenium) for 8 weeks. At the end of the rearing period, blood samples were prepared from fish to evaluate liver enzymes and immune system indices. The final weight and daily growth in fish fed with diet A (0.1 mg /kg) were significantly higher than those fed with diet C (0.3 mg/kg). But there was no significant difference with fish fed with diet D (non Nanoselenium). The condition factor and protein efficiency ratio of fish fed with diet containing 0.1 mg/kg Nanoselenium was significantly higher than fish fed with diets C and D. There was no significant difference in the of total immunoglobulin (IgM) and complement (ACH50) in different groups, But the secretion of lysozyme in fish fed with diet B was significantly higher than other groups. There was no significant difference in the activities of alkaline phosphatase, aspartate aminotransferase and alanine aminotransferase enzymes in fish fed with diets containing Nanoselenium compared to the treatment without Nanoselenium. It seems that inclusion of 0.1 and 0.2 mg of Nanoselenium per kilogram has a positive effect on the growth indices and immune system of Acipenser stellatus in growth stage.