Improving low-temperature stress tolerance of tilapia, Oreochromis niloticus: A functional analysis of Astragalus membranaceus
文献类型： 外文期刊
作者： Wu, Fan 1 ; Yang, Changgeng 1 ; Wen, Hua 1 ; Zhang, Chen 1 ; Jiang, Ming 1 ; Liu, Wei 1 ; Tian, Juan 1 ; Yu, Lijuan 1 ; Lu, 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Minist Agr, Key Lab Freshwater Biodivers Conservat & Utilizat, Wuhan 430223, Hubei, Peoples R China
2.Ling Nan Normal Univ, Life Sci & Technol Sch, Zhanjiang, Peoples R China
关键词： Astragalus membranaceus; low temperature; Oreochromis niloticus; stress
期刊名称：JOURNAL OF THE WORLD AQUACULTURE SOCIETY （ 影响因子：2.512； 五年影响因子：2.47 ）
ISSN： 0893-8849
年卷期： 2019 年 50 卷 4 期
页码：
收录情况： SCI
摘要： A 54-day experiment was conducted to investigate the effects of dietary supplementation of Astragalus membranaceus extract powder (AMEP) on the low temperature tolerance of genetically improved farmed tilapia, Oreochromis niloticus. The base diet was supplemented with 0.0% (NC), 0.1% (NP0.1), 0.2% (NP0.2), and 0.4% (NP0.4) AMEP. Tilapia with an initial body weight of 21.35 +/- 0.17 g were fed three times a day for 14 days at 30 degrees C and then fed for 40 days while the water temperature decreased at a rate of 0.5 degrees C/day. The results showed that survival, final weight, and the rate of weight gain in fish in the NP0.1, NP0.2, and NP0.4 groups were higher than those of fish in the NC group. The contents of glucose, triglyceride, cholesterol, and nitric oxide in the serum of fish fed diets supplemented with AMEP were all significantly lower than those of fish in the NC group. In contrast, fish fed with AMEP-supplemented diets had higher liver superoxide dismutase, glutathione peroxidase and catalase activities, and lower malonaldehyde content than those of fish in the NC group at 10 degrees C. The expression of the growth-arrest-specific 2 gene in the liver was significantly lower in the NP0.2 and NP0.4 groups than in the NC group. The results of this study demonstrated that the optimal level of AMEP supplementation was 0.2% under the conditions used in the current study. Optimum dietary AMEP can promote growth performance and facilitate the survival of tilapia under low-temperature stress.
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