不同脂肪源对真鲷幼鱼生长、存活及体内脂肪酸组成的影响

Effects of different lipids on growth,survival and tissue fatty acid composition of juvenile Pagrosomus major

真鲷幼鱼摄食缺乏多不饱和脂肪酸(PUFA)饵料时,其生长增重率和存活率比摄食富含PUFA配合饵料或玉筋鱼鱼糜的明显下降。幼鱼摄食含有不同脂肪酸饵料时,其肌肉和肝脏组极性或非极性脂中脂肪酸组成都有变化。肌肉和肝脏极性脂中的PUFA比非极性脂中PUFA含量高,并且当饵料中不能提供足够的PUFA时,非极性脂中的PUFA下降明显,而极性脂中的PUFA变化较小,被优先贮存。真鲷幼鱼肌肉和肝脏组织缺乏n-9、n-6和n-3相互转化的能力。因此,为提高幼鱼的生长增重率和存活率,必须保证饵料中含有足够的PUFA。

When juvenile red seabream were fed with diets short of PUFA, its weight gain and survival ratio decreased significantly compared with those fed with diets abundand in PUFA or minced fish meal. Its fatty acid composition of non-polar and polar lipids from muscles and livers varied as it was fed with the diets containing different fatty acids. PUFA contents in polar lipids from muscles and livers were higher than those in non polar lipids. A markable decrease of PUFA in non-polar lipids occured when the fish fed on diets with very low content of PUFA,whereas the PUFA in polar lipids decreased slightly and were preserved preferentially. There are nointerconvertible ability among n-9,n-6,and n-3 in muscles and livers of the juvenile.It is essential to add PUFA into the diets so as to increase the weight gain and survival ratio of the juvenile.