This study was conducted to evaluate the influence of dietary lysophospholipids combined with 1% dietary fish oil reduction on the growth performance and hepatic lipid metabolism of largemouth bass (Micropterus salmoides). Five isonitrogenous feeds were prepared with lysophospholipids at 0% (fish oil group, FO), 0.05% (L-0.05), 0.1% (L-0.1), 0.15% (L-0.15) and 0.2% (L-0.2), respectively. The dietary lipid was 11% in the FO diet and 10% in the other diets. Largemouth bass were fed for 68 d (initial body weight = 6.04 ± 0.01 g) with 4 replicates per group and 30 fish per replicate. The results showed that the fish fed diet containing 0.1% lysophospholipids had higher digestive enzyme activity and obtained better growth performance compared to the fish fed FO diet (P < 0.05). The feed conversion rate in the L-0.1 group was significantly lower than that in the other groups. Serum total protein and triglyceride contents in L-0.1 group were significantly higher than those in other groups (P < 0.05) and the contents of total cholesterol and low-density lipoprotein cholesterol in L-0.1 group were significantly lower than those in FO group (P < 0.05). The activity and genes expression of hepatic glucolipid metabolizing enzymes in L-0.15 group were significantly increased compared to those in FO group (P < 0.05). Reducing 1% fish oil along with 0.1% lysophospholipids added to the feed could improve the digestion and absorption of nutrients, enhance the activity of liver glycolipid metabolizing enzymes, and thus effectively promote the growth of largemouth bass.

本研究旨在评估日粮溶血磷脂联合减少 1% 日粮鱼油对大口黑鲈 (Micropterus salmoides )生长性能和肝脏脂质代谢的影响。用 0%（鱼油组，FO）、0.05%（L-0.05）、0.1%（L-0.1）、0.15%（L-0.15）和 0.2%（L-0.2）的溶血磷脂制备五种等氮饲料，分别。FO 饮食中的膳食脂质为 11%，其他饮食中为 10%。大口黑鲈喂食 68 天（初始体重 = 6.04 ± 0.01 g），每组重复 4 次，每次重复 30 条鱼。结果表明，与饲喂 FO 饲料的鱼相比，饲喂含 0.1% 溶血磷脂的饲料具有更高的消化酶活性并获得更好的生长性能（P< 0.05)。L-0.1组的饲料转化率明显低于其他组。L-0.1 组血清总蛋白和甘油三酯含量显着高于其他各组（P < 0.05），总胆固醇和低密度脂蛋白胆固醇含量 L-0.1 组显着低于 FO 组（ P < 0.05）P < 0.05）。L-0.15组肝糖脂代谢酶活性及基因表达较FO组显着升高（P< 0.05)。在饲料中减少添加1%的鱼油和0.1%的溶血磷脂，可以改善营养物质的消化吸收，增强肝脏糖脂代谢酶的活性，从而有效促进大口黑鲈的生长。