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

这项研究调查了日粮脂质含量对亚洲红尾cat（Hemibagrus wyckioides）的生长速度，饲料利用率，消化酶活性和抗氧化能力的影响。），从而评估最佳的饮食脂质需求量。准备了五种等蛋白饮食，其中包含不同水平的饮食脂质（3％，5.5％，8％，10.5％和13％）。在维持在28±1°C的循环耕作系统中，将每种饮食喂入三组幼体（平均体重3.20 g）。日增重系数（DGC）和蛋白质效率比随着日粮脂质含量高达10.5％而稳步提高，然后达到稳定水平。同样，蛋白质的保留随着饮食中脂质含量的增加而逐渐增加，达到13％。相反，脂质的滞留随饮食中脂质含量的增加而线性下降，但是在以8％，10.5％和13％的脂质喂养的少年中，没有发现显着差异。在以10.5％或13％脂质喂养的幼鱼中观察到最佳饲料转化率（FCR）。血浆胰岛素样生长因子1水平随着饮食中脂质含量的增加稳定增加至8％。但是，血浆中的氨基甲基丙二醇，天冬氨酸转氨酶和丙氨酸转氨酶的活性通常随着饮食中脂质含量的增加而降低。此外，在以10.5％脂质喂养的少年中，肝脏的过氧化物酶，过氧化氢酶，谷胱甘肽过氧化物酶和碱性磷酸酶的活性最高。DGC或FCR对不同饮食脂质水平的单斜线折线回归分析表明，少年的最佳饮食脂质需求量 此外，在以10.5％脂质喂养的少年中，肝脏的过氧化物酶，过氧化氢酶，谷胱甘肽过氧化物酶和碱性磷酸酶的活性最高。DGC或FCR对不同日粮脂质水平的单斜折线回归分析表明，少年的最佳日粮脂质需求量 此外，在以10.5％脂质喂养的少年中，肝脏的过氧化物酶，过氧化氢酶，谷胱甘肽过氧化物酶和碱性磷酸酶的活性最高。DGC或FCR对不同日粮脂质水平的单斜折线回归分析表明，少年的最佳日粮脂质需求量wyckioides分别占日粮含蛋白质42％的11.1％或9.4％。