Compound plant extracts (CPE) are beneficial for aquatic animals on growth performance and antioxidant capacity. A 56‐day experiment was conducted to investigate its positive effect on rice field eel. The fish were fed a commercial diet and supplementing CPE (mainly containing eucommia polysaccharides, reducing sugar) at 0, 0.8, 1.6, 2.4, and 3.2 g/kg. Results showed that dietary CPE significantly increased weight gain and specific growth rate (p < 0.05). Liver lipid content in 1.6 and 3.2 g/kg groups was significantly lower than in 0.8 and 2.4 g/kg groups (p < 0.05). Muscle lipid content in 0.8, 2.4, and 3.2 g/kg CPE groups was significantly lower than in control (p < 0.05). Meanwhile, intestinal digestive enzymatic activities in the 3.2 g/kg CPE group were the highest in comparison to all other groups (p < 0.05). Dietary CPE enhanced the antioxidant activities of serum and intestine (p < 0.05). Compared with the control, intestinal fold thickness in CPE groups was significantly increased (p < 0.05). Furthermore, dietary CPE reduced the degree of liver steatosis and the number of lipid droplet vacuoles. This study indicated that dietary CPE was beneficial to growth performance, antioxidant capacity, liver, and intestinal histology. Supplementation with 1.6–3.2 g/kg CPE is optimal for this eel species.

中文翻译：

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复合植物提取物对黄鳝生长性能、抗氧化能力及肝肠组织形态的影响

复合植物提取物（CPE）有利于水生动物的生长性能和抗氧化能力。进行了 56 天的实验来研究其对黄鳝的积极作用。饲喂商品饲料，并添加0、0.8、1.6、2.4、3.2 g/kg CPE（主要含杜仲多糖、还原糖）。结果表明，膳食 CPE 显着增加了体重增加和特定生长率（p< 0.05）。1.6和3.2 g/kg组的肝脏脂质含量显着低于0.8和2.4 g/kg组（p< 0.05）。0.8、2.4和3.2 g/kg CPE组的肌肉脂质含量显着低于对照组（p <0.05）。同时，与所有其他组相比，3.2 g/kg CPE 组的肠道消化酶活性最高（p <0.05）。膳食 CPE 增强血清和肠道的抗氧化活性（p <0.05）。与对照组相比，CPE组肠襞厚度显着增加（p <0.05）。此外，膳食 CPE 降低了肝脏脂肪变性的程度和脂滴空泡的数量。这项研究表明，膳食 CPE 对生长性能、抗氧化能力、肝脏和肠道组织学有益。补充 1.6–3.2 g/kg CPE 对于该鳗鱼品种是最佳选择。