本试验旨在可消化氨基酸平衡模式下，研究混合动物蛋白在不同蛋白质水平下替代饲料中低温干燥鱼粉后对花鲈（Lateolabrax japonicus）生长性能和体成分的影响。混合动物蛋白由鸡肉粉、牛肉骨粉、喷雾血球干燥粉、水解羽毛粉以40∶35∶20∶5的比例组成，分别在高蛋白质水平和低蛋白质水平下替代0、50%、75%和100%的低温蒸汽干燥鱼粉。选取初始均重为（13.3±0.1）g的花鲈720尾，随机分为8组（每组3个重复，每重复30尾鱼），分别饲喂1种试验饲料，试验期为8周。结果表明：在可消化氨基酸平衡模式下，降低饲料蛋白质水平，花鲈的末均重、增重率及能量沉积率均显著降低(P<0.05)，饲料系数显著升高(P<0.05)；体成分指标无显著变化（P>0.05）。同一蛋白质水平下，用混合动物蛋白替代鱼粉可显著降低花鲈的末均重、成活率、增重率、摄食率、蛋白质沉积率、能量沉积率、脏体比及全鱼粗蛋白质、总能和粗脂肪含量(P<0.05)，显著升高花鲈的饲料系数和全鱼水分、灰分含量(P<0.05)。蛋白质水平和替代水平对花鲈的生长性能和体成分各指标无显著的交互作用(P>0.05)。由此得出，在可消化氨基酸平衡模式下，饲料蛋白质水平显著影响花鲈的生长性能，但对体成分指标无显著影响。混合动物蛋白替代鱼粉水平显著影响花鲈的生长性能和体成分指标，混合动物蛋白对鱼粉的替代水平应低于50%。

An 8-week feeding trial was conducted to study the effects of substitution of dietary low temperature steam-dried fish meal (LT-FM) for blended animal proteins (BAP) at two protein levels (40% and 43%, respectively) on growth performance and body composition of Japanese sea bass, Lateolabrax japonicus under the optimum digestible amino acids (ODAA) profile. In this trial, BAP was composed of poultry by-product meal, meat and bone meal (beef), spray dried blood meal and hydrolyzed feather meal at the ratio of 40∶35∶20∶5, and 0, 50%, 75% and 100% of LT-FM were replaced by BAP at two protein levels, respectively. Seven hundred and twenty juvenile Japanese sea bass with initial body weight of (13.1±0.1) g were randomly divided into eight groups with three replicates in each group and thirty fish per replicate. During the feeding trial, fish in eight groups were fed one of eight experimental diets, randomly. The results showed as follows: under the ODAA profile, with the dietary protein levels decreasing, the final average weight (FAW), weight gain rate (WGR) and protein productive value (PPV) of Japanese sea bass were significantly decreased (P<0.05), and the feed conversion rate (FCR) was significantly increased (P<0.05), while the body composition indices were not significantly different (P>0.05). At the same protein level, substitution of LT-FM for BAP could significantly decrease the FAW, survival rate (SR), WGR, feeding rate (FR), protein productive value (PPV), energy productive value (EPV), viscerasomatic index (VSI) and crude protein, gross energy and crude lipid contents of fish body (P<0.05), and significantly increase the FCR and moisture, ash contents of fish body (P<0.05). There was no interactive effect between protein levels and substitution levels on any growth performance and body composition indices (P>0.05). In conclusion, under the ODAA profile, dietary protein levels could significantly affect the growth performance of Japanese sea bass,but there was no significant effect on the body composition indices. Substitution levels of BAP to fish meal could significantly affect the growth performance and body composition indices of Japanese sea bass, and the substitution level of BAP to fish meal should be no more than 50%.［Chinese Journal of Animal Nutrition, 2010，22（4）:1113-1121］