In this study, the hematological and growth performance of beluga (Huso huso) fed with herbal supplemented diet were studied. Dietary treatments were control (normal diet), 1 g garlic(Allium sativum)and 1 g nettle (Urticadioica) per 100g feed for 60 days. No significant difference was observed in growth performance between the groups(P>0.05). MCV increased significantly in nettle group compared to control group after 60 days (P<0.05). Lymphocyte increased in nettle and garlic groups compared to control group after 20 days (P<0.05). In conclusion, it seems that herbal diet can improve hematological parameters and immune-competent cell activity in this species.