An 8-week feeding experiment was conducted to investigate the effects of dietary n-3 highly unsaturated fatty acids (n-3 HUFAs) on growth performance, fatty acid profiles, hematological characteristics and hepatopancreatic histology in juvenile Pacific white shrimp (Litopenaeus vannamei) (initial average weight, 0.14 ± 0.01 g). Six isoproteic and isolipidic diets were formulated with graded levels of n-3 HUFA (0.24, 0.53, 0.86, 1.25, 1.58 and 1.97 % of dry matter), and the 0.24 % group was used as control group. The results revealed that shrimp fed the diet containing 0.86 % n-3 HUFA had highest weight gain (WG) and specific growth rate (SGR), and the feed conversion ratio (FCR) showed the minimum at the same level. Shrimp muscle fatty acid profiles reflected that of diet. The contents of triglyceride (TG) and low-density lipoprotein cholesterol (LDL-C) in serum decreased along with n-3 HUFA levels increasing. The activity of superoxide dismutase (SOD) in hepatopancreas was highest significantly at the level of 0.86 % n-3 HUFA group than that in other groups. The content of malondialdehyde (MDA) in hepatopancreas increased with the increasing of n-3 HUFA levels, which reached the maximum value in 1.97 % group and was significantly higher than that in control group. The levels of n-3 HUFA could obviously affect on the cell morphology and lipid deposition in hepatopancreas of L. vannamei. Results of this study suggested that shrimp fed moderate dietary n-3 HUFA could enhance growth, feed utilization, antioxidant capacity and reduces excess lipid deposition.

进行了一个为期8周的饲养实验，以研究日粮n-3高不饱和脂肪酸（n-3 HUFA）对太平洋白对虾（南美白对虾）生长性能，脂肪酸谱，血液学特征和肝胰腺组织学的影响）（初始平均重量，0.14±0.01 g）。配制了6种等蛋白和等脂日粮，其中n-3 HUFA的含量为分级水平（干物质的0.24％，0.53％，0.86％，1.25％，1.58％和1.97％），而0.24％组用作对照组。结果表明，饲喂含0.86％n-3 HUFA饲料的虾，其增重（WG）和比生长速率（SGR）最高，而饲料转化率（FCR）在相同水平下最低。虾的肌肉脂肪酸谱反映了饮食结构。随着n-3 HUFA水平的升高，血清甘油三酯（TG）和低密度脂蛋白胆固醇（LDL-C）含量降低。肝胰腺中超氧化物歧化酶（SOD）的活性在n-3 HUFA组为0.86％，高于其他组。肝胰腺中丙二醛（MDA）的含量随n-3 HUFA水平的升高而增加，在1.97％的组中达到最大值，并显着高于对照组。n-3 HUFA的水平明显影响肝胰腺细胞形态和脂质沉积。凡纳对虾。这项研究的结果表明，喂食适度日粮n-3 HUFA的虾可以增强生长，饲料利用率，抗氧化能力并减少过多的脂质沉积。