饲料中脂肪水平对幼蟹生长和饲料利用率的影响

The effects of dietary lipid levels on the growth response and feed conversion efficiency of juvenile crab Eriocheir sinensis

以初始体重为(0.85±0.09)g的幼蟹为实验对象,在室内水族箱中进行为期30d的生长实验。以鱼油/豆油(2∶1,W/W)为脂肪源,配制成脂肪含量分别为0%、2%、4%、6%、8%和10%的6种等氮、等能饲料,用于探讨饲料中脂肪水平对幼蟹生长及饲料利用率的影响。实验结果表明,随着饲料脂肪水平的提高,虽然实验幼蟹的增重率、饲料转化率、蛋白质效率和蛋白质利用率也随之提高,各处理之间的差异不显著(P>0.05)。但随着饲料脂肪水平的提高,幼蟹对脂肪的摄食率和养殖成活率差异显著(P<0.05)。因此,认为饲料中脂肪含量达6.61%～9.96%时可满足幼蟹的生长。

This experiment was conducted to evaluate the level of dietary fish oil/soybean oil(2∶1,w/w)mixture needed for maximum weight gain and feed conversion efficiency of juvenile crab.Six isoenergetic and isonitrogenous semipurified diets,with lipid levels ranging from 0 to 10% in 2% increments were evaluated. After termination of experiment for 30 days, the differences were not significant(P>0.05)in the precent weight gain, feed conversion efficiency, protein efficiency ratio and protein utilization rate. The feeding rate of lipid and percent survival were significantly high (P<0.05) with the diet oil increasing. It is suggested that the dietary lipid level ranging from 6.61% to 9.96% appears to meet the lipid requirement for this crab species.