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Turkish Journal of Fisheries and Aquatic Sciences 2013, Vol 13, Num, 2     (Pages: 211-220)

Effect of High Dietary Carbohydrate on Growth, Serum Physiological Response, and Hepatic Heat Shock Protein 70 Expression of Wuchang Bream (Megalobrama amblycephala) at Two Temperatures

Chuanpeng Zhou 1 ,Bo Liu 1-2 ,Jun Xie 1-2 ,Xianping Ge 1-2

1 Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China
2 Key Laboratory of Genetic Breeding and Aquaculture Biology of Freshwater Fishes, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, No. 9, Shanshui East Road, Wuxi City, Jiangsu Province 214081, China
DOI : 10.4194/1303-2712-v13_2_03 Viewed : 1207 - Downloaded : 1410 The effects of high carbohydrate diet on growth, serum physiological response, and hepatic heat shock protein 70 expression in Wuchang bream were determined at 25 °C and 30 °C. The fish were reared at 25 °C had significantly higher serum C3, respiratory burst activity and hepatic superoxide dismutase activity, lower hepatic malonaldehyde than those were reared at 30 °C (P<0.05). At each temperature, the fish fed the control diet (31% CHO) had significantly higher weight gain, specific growth rate, respiratory burst activity, lysozyme, alkaline phosphatase, hepatic total antioxidative capacity, lower feed conversion ratio, glutamic-oxaloacetic transaminase, cortisol, hepatic malonaldehyde and the relative level of hepatic HSP70 mRNA than those fed the high-carbohydrate diet (47% CHO) (P<0.05). Significant interactions between temperature and diet were found for glutamic-oxaloacetic transaminase, C3, lysozyme, alkaline phosphatase and respiratory burst activity and hepatic superoxide dismutase activity (P<0.05). The present study suggested that higher dietary carbohydrate impact growth performance, the nonspecific immune ability and hepatic antioxidant abilities of Wuchang bream at higher temperature. Keywords : Megalobrama amblycephala; Dietary carbohydrate; Temperature; Growth; Immunity; HSP70