This study was carried out to show the effects of herbal supplement of Sangrovit on the growth parameters, blood biochemical factors, survival and resistance to salinity of the Caspian kutum fry. Fish (1±0.003 g) were divided into four groups fed on diets containing sangrovit at different levels: 0 (control), 0.05, 0.1 and 0.15 % for 45 days. The results showed that there was a significant increase in the final weight, weight gain and specific growth rate of the fish fed on sangrovit diets (p<0.05). In addition, food conversion rate of fish fed on sangrovit diet was found to be significantly (p<0.05) lower than the control group. However, there was no significant difference in the condition factor, glucose and total protein levels of the experimental groups and the control group (p>0.05). On the other hand, blood cholesterol of the Caspian kutum was significantly increased in the control group (190.17±0.013 mg dl^-1) in comparison to treatments sangrovit (p<0.05). Survival and resistance to salinity stress remained unaffected by dietary supplementation of sangrovit (p>0.05). The results of the present study also indicated that dietary Primalac beneficially affected the growth performance and blood biochemical parameters of the Caspian kutum fry. The findings of the present study indicated that the herbal supplement of sangrovit could improve the growth rate, feed utilization and blood biochemical parameters of the Caspian kutum fry.