Optimal dietary lipid requirement for juvenile Asian red-tailed catfish (Hemibagrus wyckioides): Dietary lipid level for Hemibagrus wyckioides

摘要: Abstract This study investigated the effects of dietary lipid content on growth rate, feed utilization, digestive enzyme activity, and antioxidant capacity juvenile Asian red-tailed catfish (Hemibagrus wyckioides), thereby to evaluate optimal requirement. Five isoproteic diets were prepared contain varied levels (3 %, 5.5 8 10.5 13 %). Each diet was fed triplicate groups juveniles (average body weight 3.20 g) in a recirculating farming system maintained at 28 ± 1 °C. Daily gain coefficient (DGC) protein efficiency ratio improved steadily with up then reached plateau. Similarly, retention increased gradually %. Conversely, decreased linearly increasing content, but no significant difference found among % lipid. The optimum conversion (FCR) observed or Plasma insulin-like factor level However, plasma amino methyl propanediol, aspartate aminotransferase alanine activities depressed generally content. Besides, highest hepatic peroxidase, catalase, glutathione alkaline phosphatase Single-slope broken-line regression analysis DGC FCR response showed that requirement H. wyckioides 11.1 9.4 containing 42 protein, respectively.