不同脂肪源对泥鳅稚鱼生长性能及脂肪酸组成的影响

为研究饲料不同脂肪源对泥鳅稚鱼生长性能及鱼体脂肪酸组成的影响, 实验选择初始体重为(10.002.00) mg的健康泥鳅稚鱼1500尾, 随机分为5组, 每组3个重复, 每个水箱100尾鱼, 分别投喂5种含有鱼油(FO)、大豆油(SO)、玉米油(CO)、花生油(PeO)和棕榈油(PaO)的配合饲料, 每种饲料3个重复, 饲养期为40d。结果显示, 摄食不同脂肪源饲料的泥鳅稚鱼在增重率、成活率、饲料系数等生长性能指标和体成分上没有显著差异(P0.05), 但是, 摄食FO组鱼体极性脂肪含量显著高于其他植物油组(P0.05)。鱼油组鱼体中性和极性脂肪中总n-3系脂肪酸含量和EPA+DHA含量显著高于其他植物油组(P0.05)。植物油组鱼体极性脂肪中20:4n-6含量显著高于鱼油组(P0.05), 表明泥鳅稚鱼具有将C18转换为C20的能力。研究表明, 在饲料中添加足量磷脂, 鱼油、大豆油、玉米油、花生油、棕榈油都可以用作泥鳅稚鱼期专用饲料脂肪源。

THE GROWTH PERFORMANCES AND THE FATTY ACID COMPOSITIONS OF DOJO LOACH MISGURNUS ANGUILLICAUDATUS FRY FED WITH DIFFERENT LIPID SOURCES

In this study, we conducted a 40-day feeding trial to evaluate the effects of different dietary lipids on the growth performance and the fatty acid composition of loach Misgurnus anguillicaudatus fry. Fish with average initial weight of (10.002.00) mg were fed with five experimental diets that contained fish oil (FO), soybean oil (SO), corn oil (CO), peanut oil (PeO) or palm oil (PaO). There were no significant differences in the weight gain, the specific growth rate, the feed conversion ratio, the survival rate, and the whole body proximate between different feeding groups. However, the concentration of the polar lipid in fish fed with FO diet was significantly higher than those fed with other plant oil diets. The portions of total n-3 fatty acids and EPA+DHA in the neutral and polar lipids of fish fed with FO diet were significantly higher than other groups fed with plant oil diets. We observed a significantly higher level of arachidonic acid (ARA, 20:4n-6) in the polar lipid in the SO, CO, PeO and PaO groups compared to the FO group, which indicated that the loach were highly capable of transforming linoleate into arachidonate. Therefore we concluded that in the presence of sufficient dietary phospholipids, FO, SO, CO, PeO and PaO could be used in the diet for the loach during their early developmental stages.