A 10‐week feeding trial aimed to investigate the effects of dietary vitamin C (l‐ascorbic acid) on growth, antioxidant activity, and immunity in ricefield eel, Monopterus albus. Six diets were formulated with different levels of vitamin C supplementation (0.1, 17.5, 34.8, 68.6, 139.7, and 278.5 mg/kg). The results indicated that the weight gain (WG) of the M. albus fed the diets with vitamin C was remarkably higher than that of the M. albus fed the control diet (p < .05), and the quadratic analysis showed an optimal vitamin C level of 80.66 mg/kg. Compared with the control group, serum lysozyme activities, the complement pathway, red blood cell counts, white blood cell counts, immunoglobulin M, and phagocytosis percentage were significantly increased (p < .05) in the treatment groups, and superoxide dismutase activity, serum glucose, and malondialdehyde content were significantly decreased (p < .05) in the treatment groups. The challenge trial with Aeromonas hydrophila showed that the M. albus fed the diets with vitamin C had remarkably reduced cumulative mortality compared with those fed the control diet (p < .05), and mortality in the 68.60 mg/kg diet group was the lowest. Based on WG, the optimal vitamin C supplementation level for M. albus was estimated to be 80.66 mg/kg.

中文翻译：

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饮食中维生素C对稻e生长，抗氧化活性和免疫力的影响

一项为期10周的喂养试验旨在研究日粮维生素C（l-抗坏血酸）对稻田Mon （Monopterus albus）生长，抗氧化活性和免疫力的影响。六种饮食配制了不同水平的维生素C补充（0.1、17.5、34.8、68.6、139.7和278.5 mg / kg）。结果表明重量增加了的（WG）黄鳝馈送有维生素C的膳食比显着高的，所述的黄鳝饲喂对照饮食（p <.05），并且二次分析显示最佳维生素C水平为80.66 mg / kg。与对照组相比，治疗组的血清溶菌酶活性，补体途径，红细胞计数，白细胞计数，免疫球蛋白M和吞噬作用百分比显着增加（p  <.05），超氧化物歧化酶活性，血清 治疗组中的葡萄糖和丙二醛含量显着降低（p <.05）。与攻击试验嗜水表明，黄鳝馈送有维生素C已显着地减少累积死亡率与喂食对照饮食相比膳食（p <0.05），而68.60 mg / kg饮食组的死亡率最低。基于WG，对于最佳补充维生素C水平黄鳝估计为80.66毫克/公斤。