YANG Wei-wei1，2，LIU Wen-bin1，SHEN Mei-fang2，TANG Jian-qing2,ZHU Jie1，QIAN Yu1
1.Key Laboratory of Aquatic Animal Nutrition and Feed Science of Jiangsu Province, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China;2.Freshwater Fisheries Research Institute of Jiangsu Province,Nanjing 210017, China
Abstract: Juvenile red swamp crayfishProcambarusclarkiiwith body weight of (7.25±0.24)g was randomly divided into five groups and fed basal diet (control group) and the basal diets supplemented with 0.5%, 1.0%, 2.0%, and 4.0% of kelp powder(treatment groups) at water temperature of (25±3)℃ with triplication for 8 weeks to evaluate the effects of kelp powder on the growth，non-specific immunity and heptaopancreatic antioxidant capacity in red swamp crayfish. The results showed that the survival rate and weight gain rate of the crayfish were significantly affected by the kelp powder (P<0.05), the best growth in the crawfish fed the diet containing 2.0% of kelp powder, and increase in survival with increase in dietary kelp powder. The serum lysozyme activity, and total protein level were found to be increased and then decreased with increase in dietary kelp powder level, the maximum at 2.0% dietary kelp powder group, and the maximal serum alkaline phosphatase activity at 1.0% dietary kelp powder group. The activities of hepatopancreatic superoxide dismutase, catalase and glutathione showed a trend of increase and then decrease with the increase in the addition of kelp powder,the maximal superoxide dismutase activity at 2.0% dietary kelp powder group, the maximal catalase and glutathione activities and the minimal malondialdehyde level at 1.0% dietary kelp powder group. In conclusion, 1.0% to 2.0% dietary kelp powder led to significant improvement of growth performance, immunity and hepatopancreatic antioxidant capacity in the crawfish, and was recommended to be used in the crawfish feed.
2014, Vol. 29 
