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Effect of Bacillus cereus as a water or feed additive on the gut microbiota and immunological parameters of Nile tilapia

文献类型： 外文期刊

作者： Wang, Miao 1 ; Liu, Guanbin; Lu, Maixin 1 ; Ke, Xiaoli 1 ; Liu, Zhigang 1 ; Gao, Fengying 1 ; Cao, Jianmeng 1 ; Zhu, H 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Minist Agr, Key Lab Trop & Subtrop Fishery Resource Applicat, Guangzhou 510380, Guangdong, Peoples R China

2.Chinese Acad Fishery Sci, Pe

关键词： Oreochromis niloticus;probiotic;Bacillus cereus;gut microbiota;immunological parameters;denaturing gradient gel electrophoresis

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

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收录情况： SCI

摘要： We evaluated the effects of Bacillus cereus, as an additive in water and feed, on the gut microbiota and immunological parameters of Nile tilapia (Oreochromis niloticus) fingerlings. Experiments were performed in tanks and net cages respectively. Experiment 1: Tilapia were housed in tanks for 42 days, and B. cereus was added to the water at 1.0 x 10(4) cfu mL(-1) (Treatment 1) and 1.0 x 10(5) cfu mL(-1) (Treatment 2) weekly. For the control, no probiotic was added. Experiment 2: Tilapia were housed in cages for 42 days, and the feed was supplemented with B. cereus at 1.0 x 10(7) cfu g(-1) (Treatment 1) and 1.0 x 10(8) cfu g(-1) (Treatment 2) weekly. For the control, no probiotic was added. Each treatment contained three replicates, with 50 male tilapias per replicate. The fish from the probiotic treatments in both tank and cage experiments had significantly higher serum lysozyme and peroxidase activities than the control. In the cage experiment, alkaline phosphatase and total superoxide dismutase activities in tilapia were significantly higher in probiotic treatments compared with the control. The results of polymerase chain reaction-denaturing gradient gel electrophoresis showed that B. cereus supplementation in the feed and water affected the autochthonous gut bacteria community of tilapia and stimulated various potentially beneficial bacteria. Therefore, B. cereus, as a water or feed additive, could enhance the immune status and affect the gut microbiota of tilapia. Bacillus cereus was more effective as a feed supplement rather than a water additive for enhancing the immune status of tilapia.

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