不同蛋白质水平对淡水黑鲷幼鱼生长性能的影响

Effects of different protein levels on growth performance in juvenile Hephaestus fuliginosus

分别给淡水黑鲷幼鱼(初始体重31．10±1．87 g)喂以蛋白质水平为30．89％、36．67％、40．08％、44．90％和 49．14％的等能颗粒饲料,探讨淡水黑鲷对饲料中蛋白质的需求。室内网箱40 d饲养试验结果表明:饲料中蛋白质含量40．08％时,淡水黑鲷幼鱼的终体重、相对增重率和相对增长率最大,均极显著高于30．89％组(P<0．01)和36．67 ％组(P<0．05);40．08％组的终体长显著高于30．89％组和49．14％组(P<0．05);40．08％组的饲料系数极显著低于 30．89％组(P<0．01),但蛋白质效率显著高于30．89％、36．67％和49．14％组(P<0．05);各组的成活率无显著差异。

The effects of dietary protein levels on growth performance of juvenile Hephaestus fuliginosus with initial body weight 31.10±1.87 g were investigated.The Hephaestus fuliginosus were fed 5 isoenergetic diets containing different protein levels（30.89 %,36.67 %,40.08 %,44.90 %,49.14 %）for 40 days.The results showed that final body weight,rela- tive weight and relative length of 40.08 % protein group were the highest,which were significantly higher than those of 30.89 %（P 〈 0.01 ） and 36.67 %（P 〈 0.05） protein group.Final body lengths of 40.08 % protein group were significantly higher （P 〈 0.05）than those of 30.89 % and 49.14 % protein group.The feed conversion rates of 40.08 % protein group were significantly decreased（P 〈 0.01 ）when compared with those of 30.89 % protein group.The protein efficiency of 40.08 % protein group were significantly higher （P 〈0.05）than the other group.There were no significant differences in survival rates among the five groups.