本文旨在研究日粮脂肪水平对翘嘴红鲌生长性能及体组成的影响。试验选用平均初始体重为（19.36±2.17） g的翘嘴红鲌540尾，随机分为6组（Ⅰ～Ⅵ组），每组3个重复，每重复30尾试验鱼，分别投喂鱼油水平为0、2%、4%、6%、8%和10%的试验饲料（日粮脂肪水平分别为2.07％、4.28％、7.14％、9.26％、11.17％和15.32％），试验期60d。结果表明：Ⅲ组的增重率和特定生长率显著高于Ⅰ、Ⅱ、Ⅴ和Ⅵ组，与Ⅳ组差异不显著（P>0.05）；Ⅲ组的饵料系数显著低于Ⅰ、Ⅱ、Ⅴ和Ⅵ组（P<0.05），与Ⅳ组差异不显著（P>0.05）；Ⅳ组的蛋白质效率最大，显著高于Ⅰ、Ⅱ、Ⅴ和Ⅵ组（P<0.05），与Ⅲ组显著不差异（P>0.05）；日粮脂肪水平对翘嘴红鲌体脂肪、蛋白质含量的影响显著（P＜0.05），对翘嘴红鲌体水分和灰分含量无显著影响（P>0.05）。回归模型分析表明翘嘴红鲌达到最优特定生长率、饵料系数和蛋白质效率的日粮脂肪水平分别为788%、8.12%和9.18%，其体组成中粗蛋白质含量最高时的日粮脂肪水平为5.68%，经分析确定翘嘴红鲌日粮的适宜脂肪水平为7.88%～9.18%。

This study was conducted to determine the effects of different dietary lipid levels on growth performance and body composition of juvenile Erythroculter ilishaeformis. Five hundred and forty juvenile Erythroculter ilishaeformis with average initial body weight of (19.36±2.17) g were randomly divided into 6 groups (groupⅠ～Ⅵ) with 3 replicates of 30 fish in each replicate. Six groups were fed diets with 0, 2%, 4%, 6%, 8% and 10% fish oil, respectively. EE levels of 6 diets were 2.07%, 4.28%, 7.14%, 9.26%, 11.17% and 15.32%, respectively. The experiment lasted for 60 days. The results showed that, weight gain ratio and specific growth ratio in group Ⅲ were significantly higher than that in groups Ⅰ, Ⅱ, Ⅴ and Ⅵ (P＜0.05); feed conversion ratio in group Ⅲ was significantly lower than that in groups Ⅰ, Ⅱ, Ⅴ and Ⅵ (P＜0.05); the protein efficiency ratio in group Ⅳ was significantly higher than that in groups Ⅰ, Ⅱ, Ⅴ and Ⅵ (P＜0.05). There was no significant difference between groups Ⅲ and Ⅳ in weight gain ratio, specific growth ratio, feed conversion ratio and protein efficiency ratio. The whole body lipid and protein contents were significantly affected by the dietary lipid supplementation levels (P＜0.05), while there were no significant effects on body moisture and ash content (P>0.05). Based on regression analysis of the specific growth ratio, feed conversion efficiency, protein efficiency and the crude protein content of body composition, the optimal dietary supplementation levels of lipid were 7.88%, 8.12%, 9.18% and 5.68%, respectively. It was concluded that the suitable dietary lipid level for the Erythroculter ilishaeformis should be 7.88%～9.18%.