Comparison of adhesive gut bacteria composition, immunity, and disease resistance in juvenile hybrid tilapia fed two different Lactobacillus strains

文献类型： 外文期刊

第一作者： Liu, Wenshu

作者： Liu, Wenshu;Gu, Zemao;Liu, Wenshu;Ren, Pengfei;He, Suxu;Xu, Li;Yang, Yaling;Zhou, Zhigang

作者机构：

关键词： Lactobacilli;Intestinal bacteria;Immunity;Adhesion;Tilapia

期刊名称：FISH & SHELLFISH IMMUNOLOGY （ 影响因子：4.581； 五年影响因子：4.851 ）

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年卷期：

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收录情况： SCI

摘要： This study compares the effects of two Lactobacillus strains, highly adhesive Lactobacillus brevis JCM 1170 (HALB) and less-adhesive Lactobacillus acidophilus JCM 1132 (LALB), on the survival and growth, adhesive gut bacterial communities, immunity, and protection against pathogenic bacterial infection in juvenile hybrid tilapia. During a 5-week feeding trial the fish were fed a diet containing 0 to 109 cells/g feed of the two Lactobacillus strains. Samples of intestine, kidney, and spleen were takenat the start and at 10, 20, and 35 days for analysis of stress tolerance and cytokine gene mRNA levels and to assess the diversity of adhesive gut bacterial communities. A 14-day immersion challenge with Aeromonas hydrophila NJ-1 was also performed following the feeding trial. The results showed no significant differences in survival rate, weight gain, or feed conversion in the different dietary treatments. The adhesive gut bacterial communities were strikingly altered in the fish fed either the HALB or the LALB, but the response was more rapid and substantial with the adhesive strain. The two strains induced similar changes in the patterns (upregulation or downregulation) of intestinal, splenic or kidney cytokine expression, but they differed in thedegree of response for these genes. Changes in intestinal HSP70 expression levels coincided with changes in the similarity coefficient of the adhesive gut bacterial communities between the probiotic treatments. The highest dose of the HALB appeared to protect against the toxic effects of immersion in A. hydrophila (P < 0.05). In conclusion, the degree to which Lactobacillus strains adhere to the gut may be a favorable criterion in selecting probiotic strain for aquaculture.

分类号： S9

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