饲料中不同水平鱼蛋白水解物对军曹鱼稚鱼生长及体组成的影响

设计4种等能等氮试验饲料,对照组以鱼粉为单一蛋白源,处理组分别以鱼蛋白水解物替代鱼粉蛋白的17%、34%和51%,军曹鱼(Rachycentron canadum)稚鱼的初始重为(3.79±0.22)g,实验在室内流水养殖系统中进行6周的饲养试验,每种饲料随机3个重复。试验结果显示不同水平鱼蛋白水解物对试验鱼的存活率没有显著影响(P0.05),除了以鱼蛋白水解物替代鱼粉蛋白51%组外,其他各组的增重率(WG)和饲料摄入量(FI)都是随着饲料中鱼蛋白水解物替代鱼粉蛋白量的增加而增加。试验结果表明,在军曹鱼稚鱼饲料中用鱼蛋白水解物替代34%的鱼粉蛋白对于军曹鱼稚鱼的生长和饲料摄入量具有一定的促进作用。军曹鱼稚鱼血浆中胆固醇含量随着饲料中鱼蛋白水解物添加水平的升高而升高,而血浆中的总蛋白含量则无此规律,各处理组血浆中的甘油三酯无显著差异(P0.05)。

EFFECT OF DIFFERENT FISH PROTEIN HYDROLYSATE(FPH) LEVEL OF DIETARY SUPPLEMENTS ON GROWTH AND BODY COMPOSITION OF LARVAE OF COBIA(RACHYCENTRON CANADUM)

4 isonitrogenous and isoenergetic test diets were studied. The control diet contained only fish meal as the sole protein source. Fish Protein Hydrolysate (FPH) was used to partially replace fish meal. The replacement levels were 17%, 34% and 51% of the fish meal protein, respectively. Larvae cobia (Rachycentron canadum) with an initial weight of (3.79±0.22)g were randomly stocked in triplicate groups in 300L indoor flow-system tanks fed with the test diets for 6 weeks. No significant differences in survival were observed among dietary treatments (P>0.05). The results showed that the percent weight gain (WG) and feed intake (FI) were also positively linearly correlated to dietary FPH percentage,except the replacement levels were 51% of the fish meal protein group was the lowest. In conclusion, the tested FPH replacement fish meal protein 34% proved an efficient growth and feed intake stimulant in larvae of cobia Rachycentron canadum. Plasma total cholesterol concentrations increase with water FPH replacement fish meal protein, but the plasma total protein concentration did not have this regularity, among the dietary treatments groups the plasma triglyceride concentration were not significant (P>0.05).