军曹鱼幼鱼对饲料中精氨酸的需要量

Studies of Arginine Requirement for Juvenile Cobia

选择初始平均质量为(14.70±0.30)g的军曹鱼幼鱼,在56 d的饲养期中分别饲喂含精氨酸质量分数为1.84%、2.07%、2.30%、2.53%和2.76%(或饲料蛋白中精氨酸质量分数为4.0%、4.5%、5.0%、5.5%、6.0%)的等氮等能精制饲料,观察精氨酸对军曹鱼生长和全鱼组成成分的影响.结果表明,当饲料中精氨酸质量分数为2.30%时,军曹鱼的特定生长率、增质量率及存活率达到最高值.饲料中精氨酸质量分数为2.30%时,全鱼粗蛋白和精氨酸水平达到最高;精氨酸质量分数为2.76%时,全鱼粗脂肪水平达到最高.以增质量率为指标,一元二次回归分析表明,军曹鱼对饲料中精氨酸的适宜需要量为2.38%(占饲料蛋白质量分数的5.17%).

The effects of varying arginine levels（1.84%,2.07%,2.30%,2.53%,2.76% in diet or 4.0%,4.5%,5.0%,5.5%,6.0% in dietary protein） on growth and body composition in juvenile cobia,Rachycentron canadum with approximately 14.7 g initial body mass were evaluated in a 56-day study.The results indicated that special growth rate,mass gain and survival rate increased when arginine level was increased from 1.84% to 2.30%,and then decreased when arginine level was increased from 2.30% to 2.76%.Crude protein（CP） content and arginine content of whole body was higher in fish fed 2.30% arginine diet than other groups.Crude fat（CF） content was higher in fish fed 2.76% arginine diet than other groups.For juvenile cobia,the optimum level of dietary arginine,determined by quadratic regression analysis,was 2.38% in diet or 5.17 % in dietary protein,on the basis of maximum mass gain.