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Effects of different feed additives on immunity and antioxidation on rainbow trout (Oncrhynchus mykiss Walbaum)

LI Chan1,2,XU Qi-you1,XU Hong1,ZHANG Tie-qi1(1.Heilongjiang River Fisheries Research Institute,Chinese Academy of Fisheries Science,Harbin 150070;2.Life Science and Technology Institute,Dalian Fisheries College,Dalian 116023)  
The effects of Nosiheptide,Flavomycin and Allitridum on the activities of catalase(CAT),superoxide dismutase(SOD),malonaldehyde diethyl acetal(MDA),lysozyme(LSZ),acid phosphatase(ACP) and alkaline phosphatase (AKP) in different tissues of Oncrhynchus mykiss Walbaum were studied by supplying various levels of feed additives in diets.For 56 days feeding of rainbow trout.The results indicated that compared with the control group,the activities of CAT in liver and kidney were significantly increased(P0.01),the activities of SOD in liver and kidney were significantly increased(P0.05),at the same time,the activities of LSZ in gill were also significantly increased(P0.05) when Allitridum supplement was at 15 mg·kg-1 level.Compared with the control group,the activities of SOD were observed significantly increased(P0.05) in liver and kidney when Nosiheptide supplement was at 2 mg·kg-1 level.The activities of AKP were significantly increased in liver(P0.01) and kidney(P0.05) respectively when Allitridum supplement was at 2 mg·kg-1 level,and the activities of AKP were significantly increased(P0.05) in liver and kidney when Allitridum supplement was at 4 mg·kg-1 level.In comparison with the control group,when Flavomycin and Nosiheptide supplement were at 8 mg·kg-1 and 2 mg·kg-1 levels,the activities of ACP in liver were significantly increased(P0.01),and when Nosiheptide and Allitridum supplement were at 4 mg·kg-1 and 15 mg·kg-1 levels,the activities of ACP in liver were significantly increased(P0.05).Compared with the control group,the MDA contents in liver were significantly reduced(P0.05) when Allitridum supplement was at 15 mg·kg-1 level,and the MDA contents in kidney and gill were significantly reduced(P0.05) when Nosiheptide supplement was at 2 mg·kg-1 level.All the results showed that feed additives supplemented in the basal formulated diet promoted the immune functions and antioxidation of rainbow trout,which might result in high resistance to diseases.
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