亚麻酸对卵形鲳鲹幼鱼生长性能、 消化酶活性及抗氧化能力的影响

探讨了饲料中不同水平的亚麻酸对卵形鲳鲹(Trachinotus ovatus)幼鱼生长性能、消化酶活性 及抗氧化能力的影响。选取均体质量为(0.380.10)g的卵形鲳鲹幼鱼随机分配6组,每组3个平行,每 个平行20尾鱼。配制6种亚麻酸质量分数分别为0.13%、0.59%、1.10%、1.60%、2.10%和2.50%的实验饲料饲喂卵形鲳鲹,每天饲喂2次,周期为56d。结果表明,饲喂含0.59%和1.10%亚麻酸饲料的实验鱼增重率、特定生长率显著高于2.1%组和2.5%组。亚麻酸水平显著影响了实验鱼的肝体比、脏体比、腹脂率、肥满度及其成活率。0.59%组实验鱼的胃蛋白酶显著高于0.13%组和2.50%组。1.10%组的淀粉酶活性显著低于其他各组。血清总抗氧化能力和过氧化氢酶活性随着饲料中亚麻酸含量的升高呈现出先升高后降低的趋势。以特定生长率为评价指标,二次曲线回归分析得出卵形鲳鲹幼鱼对亚麻酸的最适需求量为饲料干质量的1.04%。

Effects of linolenic acid level on growth performance,digestive enzymes and antioxidant capacity of juvenile golden pompano (Trachinotus ovatus)

To determine the effects of dietary linolenic acid (LNA) level on growth performance, digestive enzymes and antioxidant capacity of juvenile golden pompano (Trachinotus ovatus), we assigned the fish [( 10.380.10)g] randomly into six groups with three replicates per group and 20 fish per replicate. Six diets were formulated with six levels of LNA (dry matter, 0.13%, 0.59%, 1.10%, 1.60%, 2.10% and 2.50%) . The fish were fed twice daily for 56 d. The results show that the weight gain and specific growth rate (SGR) of fish fed diet with 0.59% and 1.10% LNA were significantly higher than those in group 2.1% and group 2.5%. Viscerosomatic index (VSI) , hepatosomatic index (HSI) , condition factor, abdominal fat and survival rate of fish were affected by dietary LNA levels significantly. The activity of pepsin of fish fed diet with 0.59% LNA was significantly higher than those fed with 0.13% and 2.50% LNA. The activity of amylase of fish fed diet with 1.10% LNA was significantly lower than those in the other groups. The total antioxidant capacity and catalase activity of serum showed an increasing trend and then decreased with increasing dietary LNA level. Quadratic regression analysis on SGR indicates that the optimum dietary LNA level for optimal growth of juvenile golden pompano was 1.04% of dry matter.