Effects of dietary supplementation of compound probiotics on growth, non-specific immunity, intestinal digestive enzyme, and microbiota of whitespotted conger (Conger myriaster) in recirculating aquaculture system

文献类型： 外文期刊

第一作者： Zhao, Xinyu

作者： Zhao, Xinyu;Shi, Bao;Ma, Xiaodong;Yan, Kewen;Chen, Yan;Zhao, Xinyu;Cheng, Hanliang;Wang, Chenbai;Wang, Chenggang

作者机构：

关键词： Compound probiotics; Non-specific immunity; Digestive enzyme; Intestinal microbiota; Conger myriaster

期刊名称：AQUACULTURE INTERNATIONAL （ 影响因子：2.9； 五年影响因子：2.6 ）

ISSN： 0967-6120

年卷期： 2023 年

页码：

收录情况： SCI

摘要： This study investigated the impact of compound probiotics on the growth performance, non-specific immunity, intestinal digestive enzyme, and microbiota of Conger myriaster in a 10-week trial conducted in a recirculating aquaculture system. The control group (CI) was fed diets with added saline, while the test group (PI) was fed diets with compound probiotics (4.2 x 10(7) CFU/g). The results showed that the growth performance of C. myriaster in the PI group was significantly higher than that in the CI group (P < 0.05). The non-specific immunity and intestinal digestive enzyme activity in the PI group were significantly higher than those in the CI group (P < 0.05). The community richness and diversity of intestinal microbiota in the PI group were significantly higher than those in the CI group (P < 0.05). At the phylum level, the relative abundance of Firmicutes, Bacteroidota, and Actinobacteriota significantly increased (P < 0.05), while the relative abundance of Spirochaetota significantly decreased in the PI group (P < 0.05). At the genus level, the relative abundance of Lactobacillus, Acinetobacter, Bacteroides, Faecalibacterium, Lachnospiraceae_NK4A136_group, and Bifidobacterium was significantly increased (P < 0.05), while the relative abundance of Vibrio and Mycoplasma was significantly decreased in the PI group (P < 0.05). Based on the KEGG functional prediction analysis, the relative abundance of carbohydrate metabolism function in the PI group was significantly higher than in the CI group (P < 0.05). Based on the COG functional prediction analysis, the relative abundance of carbohydrate transport and metabolism function in the PI group was significantly higher than in the CI group (P < 0.05). These results indicate that the dietary supplementation of compound probiotics (4.2 x 10(7) CFU/g) provided better growth performance, non-specific immunity activity, and intestinal digestive enzyme activity and regulated the homeostasis of intestinal microbiota in C. myriaster.

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