This research was conducted with the aim of investigating the effects of Aloe vera extract on antioxidant enzymes, survival rate and non-specific immune indices of Siberian sturgeon (Acipenser baerii). A total of 180 Siberian sturgeon with an average weight of 10.95 ± 0.04 g were randomly distributed into four groups including a control group and three experimental groups (each group with three replications). Aloe vera powder extract was added to the special diet of the experimental groups in proportions of 0.5, 1 and 1.5%. Fish were fed manually with their special diet in fiberglass tanks for eight weeks. At the end of the breeding period, catalase, GPX and SOD enzymes were measured. The results showed that the amount of catalase, SOD and GPX in the blood serum of the fish in the treatments increased compared to the control (P<0.05). The amounts of lysozyme and ACH50, as non-specific immune components, were measured. The results showed that there is a significant difference in the amount of lysozyme and ACH50 in the treatments compared to the control group (P<0.05). In addition, during the breeding period, no losses were observed in the reservoirs, and the survival rate in the treatments and the control was 100%. Based on this, it was determined that Aloe vera extract has non-specific immune enhancing effects and its use at the rate of 1.5% in the diet can improve the activity of antioxidant enzymes and also as an immune stimulant in order to prevent disease be effective in the Siberian sturgeon.
 

Siberian sturgeon, Aloe vera extract, Antioxidant enzymes, Survival, Immune