采用一种对照饲料和三种分别含４％、６％和８％大豆磷脂的试验饲料饲养初始体重约１５ｇ的草鱼，经５２天饲养后，运用气相色谱仪测定草鱼肝胰脏脂质的脂肪酸组成。与摄食对照饲料的草鱼比较，三组添加大豆磷脂的草鱼肝胰脏脂质具有较高水平的１８∶２ｎ－６和较低的２０∶４ｎ－６／１８∶２ｎ－６比值。与此相反，１８∶３ｎ－３的含量下降３０％～６９％，而ｎ－３系列长链（Ｃ≥２０）高度不饱和脂肪酸（ｎ－３ＨＵＦＡ，包括２０∶５ｎ－３、２２∶５ｎ－３和２２∶６ｎ－３）的含量升高，使ｎ－３ＨＵＦＡ／１８∶３ｎ－３的比值显著增大 Grass carp with a body weight of about 15 g was fed on a control diet and three test diets containing 4%, 6%, and 8% soy lecithin respectively. After 52 days of feeding, the fatty acids of hepatopancreas lipid of grass carp composition. Three groups of grass carp hepatopancreas lipid supplemented with soy lecithin had higher levels of 18: 2n-6 and lower 20: 4n-6/18: 2n-6 ratios compared with grass carp fed the control diet. In contrast, the 18: 3n-3 content was reduced by 30% to 69%, while the n-3 series of long chain (C≥20) highly unsaturated fatty acids (n-3HUFA including 20: 5n-3,22: 3 and 22: 6n-3) increased significantly so that the ratio of n-3HUFA / 18: 3n-3 was significantly increased