Effects of stocking density on the growth performance, digestive enzyme activities, antioxidant resistance, and intestinal microflora of blunt snout bream (Megalobrama amblycephala) juveniles

文献类型： 外文期刊

第一作者： Wang, Yi-Wei

作者： Wang, Yi-Wei;Zhu, Jian;Zhu, Jian;Ge, Xian-ping;Sun, Sheng-Ming;Li, Bing;Hou, Yi-Ran;Ren, Ming-Chun;Su, Yan-Li

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关键词： antioxidant resistance; digestive enzyme; growth performance; intestinal microflora; Megalobrama amblycephala; stocking density

期刊名称：AQUACULTURE RESEARCH （ 影响因子：2.082； 五年影响因子：2.415 ）

ISSN： 1355-557X

年卷期： 2019 年 50 卷 1 期

页码：

收录情况： SCI

摘要： In this study, effects of stocking density on the growth performance and physiological responses of blunt snout bream, Megalobrama amblycephala juveniles were evaluated. The fish (average body weight, 25.76 +/- 2.25 g) were randomly stocked at densities of 30F (30 fish/m(3)), 60F, 90F and 120F in 12 cages (1 m x 1 m x 1 m) in a concrete pond, with three cages for each density, for a period of 6 weeks. The higher stocking densities had a negative effect on individual growth performance. The results indicated that serum cortisol, triglyceride, alanine aminotransferase, aspartate transaminase, alkaline phosphatase and malondialdehyde activities; and Acinetobacter, Aeromonas, Pseudomonas and Vibrio numbers in the intestinal microflora increased significantly as the stocking density increased. In contrast, the viscerosomatic index, hepatosomatic index survival rate; serum glucose, total cholesterol, lipase, protease, glutathione peroxidase and superoxide dismutase activities; and Clostridium, Bacteroides, Lactococcus, Lactobacillus and Bacillus numbers in the intestinal microflora decreased significantly. The 90F and 120F groups showed obvious enlargement of the lamina propria and goblet cell damage, indicating that the gut showed inflammatory responses. The specific growth rate and weight gain rate increased significantly as the stocking density increased from 30 to 60 fish/m(3), but decreased significantly when the stocking density was over 60 fish/m(3).

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