哲罗鱼稚鱼氨基酸的需要量

采用高生物价的酪蛋白、明胶为蛋白源的蛋白饲料(PD)和无蛋白饲料(FPD)饲养哲罗鱼稚鱼(6.8～7.3g),通过在实验开始和结束时测定鱼体氨基酸的组成,研究氨基酸的增重需要和维持需要,并计算哲罗鱼必需氨基酸的需求量。试验在室内玻璃钢水族箱中进行,分两个处理,每个处理3个重复,每个重复25尾鱼。试验期间水温23～25℃,溶氧为6.4～7.5mg/L,试验共进行28d。试验结果表明,与FPD组相比,PD组鱼成活率、饲料系数、增重率、粗脂肪的含量均显著升高(P<0.05),而FPD组的水分含量显著增加(P<0.05)。PD组和FPD组鱼体粗蛋白的末含量与初始值相比差异不显著(P>0.05)。鱼体必需氨基酸的维持量(除色氨酸外)均占鱼体必需氨基酸的增加量和维持量之和的20%～30%,色氨酸占54.52%,所以在估计鱼体必需氨基酸的需要量时,鱼体必需氨基酸的维持量是不能忽略的。哲罗鱼各种EAA需求量g/(100g鱼体重)/d]为苏氨酸(Thr)0.040,缬氨酸(Va1)0.041,蛋氨酸(Met)0.027,异亮氨酸(I1e)0.034,亮氨酸(Leu)0.067,苯丙氨酸(Phe)0.035,赖氨酸(Lys)0...

Requirement of essential amino acids for Hucho taimen juvenile

Feeding experiments were conducted with protein diets(PD)and protein-free diets(FPD) for Hucho taimen(6.8-7.3 g),the diets(PD) was prepared by casein and gelatin as protein source with high biological values.The whole body amino acid composition was determined at the beginning and the end of the study.The requirements of Hucho taimen for essential amino acids(EAA) were determined based on the daily increment and daily maintenance requirement of each EAA in fish body.Fish were raised in tanks.There were 2 di...