EM菌对杂交黄颡鱼"黄优1号"越冬期间养殖池水质、生长特性及非特异性免疫指标的影响OA

To explore the effects of effective microorganisms(EM)on water quality,as well as growth performance and non-specific immunity of the hybrid yellow catfish"Huangyou-1"(Pelteobagrus vachelli ♂×Pelteobagrus ful-vidraco♀)during overwintering period,the hybrid yellow catfish"Huangyou-1"[body weight(10.35±1.23)g,body length(8.5±0.4)cm]were fed with EM for 42 days.The results showed that the dissolved oxygen content in pond water of EM-splashed group was higher than that of the EM-mixed fodder group and the control group,and the ammonia nitrogen and nitrite content was always lower in EM-splashed group.The survival rate,weight gain rate and specific growth rate of fish in EM-mixed fodder group were higher than the other two groups,and the hepatosomatic index and viscerosomatic index were lower than the other two groups.The activities of acid phosphatase,alkaline phosphatase,superoxide dismutase and lysozyme of two EM-supplemented groups were significantly higher than the control group(P<0.05),and the EM-mixed fodder group was particularly significant.The results showed that the use of EM could improve water quality during wintering to a certain extent,and had a significant promotion on growth and non-specific immune function of hybrid yellow catfish"Huangyou 1"over wintering.