条石鲷仔、稚、幼鱼脂肪酸组成变化研究

Study of fatty acid composition change of Oplegnathus fasciatus in larva,juvenile,young stages

通过采用GC/MS法研究了条石鲷(Oplegnathus fasciatus)仔鱼、稚鱼及幼鱼阶段的脂肪酸组成和变化特点。共检测到28种脂肪酸,其中饱和脂肪酸(SFA)13种,单不饱和脂肪酸(MUFA)7种,多不饱和脂肪酸(PUFA)8种。结果表明:条石鲷鱼苗内源性营养阶段以饱和脂肪酸C16∶0、C20∶0及单不饱和脂肪酸C16∶1、C18∶1作为能量代谢的主要来源;必需脂肪酸C20∶4(n-6)(AA)、C22∶5(n-3)(DPA)和C22∶6(n-3)(DHA)在稚鱼期含量较低,∑EPA+DHA仅为6.89%,认为是发生稚鱼"胀鳔病"的主要原因;仔鱼开口前体内的DHA和EPA是由母体卵黄提供的。

In this study, the GC/MS method was used to research the fatty acid composition and change characteristics of Oplegnathus fasciatus in larva, juvenile, young stages. In total, there were 28 fatty acids found, including 13 saturated fatty acids （SFA）, 7 monounsaturated fatty acids （MUFA）, and 8 polyunsaturated fatty acids （PUFA）. Resuhs indicated that saturated fatty acids like C16 ： 0, C20 ： 0 and monounsaturated fatty acids like C16 ： 1, C18 ： 1 were the main source of energy metabolites for Oplegnctthus fasciatus fry in endogenous vegetative stage. Judging by the low content of essential fatty acids likeC20 ： 4 （ n - 6 ） （ AA）, C22 ： 5 （ n - 3 ） （DPA）, C22：6 （n -3） （DHA） in juvenile stage, and the content of ∑ EPA ＋ DHA was only 6. 89%. This must be the primary reason why juvenile tend to have the ＂bulge Biao disease＂. The DHA and EPA of Drelarva came from maternal yolk.