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Physiological parameters and gut microbiome associated with different dietary lipid levels in hybrid yellow catfish ( Tachysurus fulvidraco female x Pseudobagrus vachellii male )

文献类型： 外文期刊

作者： Zhu, Haojun 1 ; Qiang, Jun 1 ; He, Jie 2 ; Tao, Yifan 2 ; Bao, Jingwen 2 ; Xu, Pao 1 ;

作者机构： 1.Nanjing Agr Univ, Wuxi Fisheries Coll, Wuxi 214081, Jiangsu, Peoples R China

2.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Key Lab Freshwater Fisheries & Germplasm Resource, Minist Agr, Wuxi 214081, Jiangsu, Peoples R China

关键词： Hybrid yellow catfish; Dietary lipid; Growth; Physiological parameters; Gut microbiome

期刊名称：COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS （ 影响因子：2.674； 五年影响因子：2.941 ）

ISSN： 1744-117X

年卷期： 2021 年 37 卷

页码：

收录情况： SCI

摘要： Yellow catfish are intensively farmed in China and are often fed a high-fat diet (HFD) with the aim of using less protein. However, an excess of dietary lipids is likely to affect the gut microflora, which strongly affects immunity and nutrient digestion. To determine the effects of different lipid levels on the growth, physiological parameters and gut microbiome of hybrid yellow catfish, we conducted an 8-week feeding experiment with a low-fat diet (2% lipids, LFD), a normal-fat diet (9% lipids, NFD), and a HFD (15% lipids) (120 fish per group). The HFD group showed higher serum alanine aminotransferase and aspartate transaminase activities, which suggests that excess dietary lipids cause liver damage. A total of 1138 operational taxonomic units, 11 phyla, and 117 genera were identified from fish gut samples. Neither the HFD nor the LFD strongly affected the microbial composition in gut samples. Compared with fish in the NFD, those in the HFD and LFD showed significantly decreased intestinal microbial diversity. The composition of macronutrients in the different diets affected the composition of intestinal microflora, mainly the phyla Fusobacteria, Proteobacteria, and Firmicutes. The HFD and the LFD favored the growth of Fusobacteria, while the HFD and LFD resulted in decreased abundance of Firmicutes and Proteobacteria, respectively. These findings shed light on the complex relationships among diet, intestinal microorganisms, and host metabolism. When using an HFD for farmed fish, its effects on the gut microbiome should be considered to avoid illness and poor growth.

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