Bacillus subtilis Supplementation in a High-Fat Diet Modulates the Gut Microbiota and Ameliorates Hepatic Lipid Accumulation in Grass Carp (Ctenopharyngodon idella)

• Published in: Fishes Vol. 7; no. 3; p. 94
• Main Authors: Guo, Daoyuan, Xie, Mengqi, Xiao, Hang, Xu, Lili, Zhang, Shiyu, Chen, Xiaoxuan, Wu, Zhixin
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-06-2022
• Subjects: Bacillus subtilis; Bacteria; Carp; Ctenopharyngodon idella; Diet; Dietary supplements; Digestive system; Fatty liver; Fish; Freshwater fishes; Gastrointestinal tract; grass carp; Grasses; High fat diet; high-throughput sequencing; Homeostasis; Intestinal flora; intestinal microbiota; Intestinal microflora; Juveniles; Lipids; Liver; Liver diseases; Metabolism; Microbiota; Next-generation sequencing; Probiotics; Serum; Beijing China; China
• ISSN: 2410-3888; 2410-3888
• DOI: 10.3390/fishes7030094

To study the effects of Bacillus subtilis supplementation in a high-fat diet on the gut microbiota and nonalcoholic fatty liver disease in grass carp (Ctenopharyngodon idella), juveniles (60 ± 5 g) were fed three diets: (a) a control diet (CON), (b) a high-fat diet (HFD) and (c) a high-fat diet supplemented with B. subtilis (HFD + BS). After 8 weeks of feeding, fish growth, serum biochemical indices and total liver lipid content were measured, and gut microbiota analysis was performed using the MiSeq250 high-throughput sequencing platform. The results of this study showed that B. subtilis could improve growth and blood serum indices and reduce lipid deposition in the fish liver, preventing fatty liver disease. A grass carp model of fatty liver induced by a high-fat diet was successfully established. Moreover, B. subtilis altered the intestinal microbiota of HFD-fed grass carp, making it more similar to that of the control group. This study revealed the important effects of B. subtilis on grass carp with fatty liver induced by a high-fat diet and provides the foundation for the application of probiotics in grass carp farming.