Effects of replacing fish meal with fermented soybean meal on growth,muscle composition and non-specific immunity of Litopenaeus vannamei

The present study was conducted to evaluate the effects of replacing fish meal with fermented soybean meal( FSM) on growth,muscle composition and non-specific immunity of Litopenaeus vannamei. Four diets were designed as control diet with 21% fish meal,and three isonitrogenous diets with 15% fish meal,in which 6% fish meal was replacedby FSM products,W305,W738,Y647,respectively. The four diets were fed to white shrimp with initial body weight of5. 1 g for 42 days. The results showed as follows: 1) There was no significant difference in survival rate among groups,and the control shrimp had the best growth. Among the three FSM groups,Y647 group had the highest weight gain( WG)and the lowest feed conversion ratio( FCR),and reached the similar growth as control. Compared with control group,the WG of W305 and W738 group were significantly reduced,and FCR significantly increased. 2) There was no significant difference in moisture and protein contents in muscle,but W305 group had a higher crude fat content,and Y647 group had a lower crude ash in muscle when compared with control group. 3) Shrimp fed diets containing FSM had higher PO activity,and shrimp fed W305 diet had higher T-SOD activity in hemolymph than that fed control diet. In conclusions,the above results indicated that FSM Y647 could substitute 6% fish meal in diet without negative influence on growth,while promoting PO activity in hemolymph of white shrimp.