. However, FOS administration resulted in lower
survival. The serum lysozyme activity was significantly affected by dietary 1% FOS (P < 0.05), while
respiratory burst activity was not significantly affected by dietary treatments (P > 0.05). In fish fed on the
diet with 1% FOS showed a significant increase of total heterotrophic autochthonous bacterial and
presumptive LAB levels (P < 0.05) compared with those fed on the diets supplemented with prebiotics. In
addition to increase in WBC, RBC, MCV, hematocrit, hemoglobin and lymphocyte levels were observed in
this group. These results indicated that dietary supplementation of FOS at a dose of 1% improved growth
performance, beneficial intestinal microbiata and stimulate immune response of stellate sturgeon
juvenile.