Fig. 2

Composition differences in gut commensal microbiota among fish in the Ctrl, Mild, and Severe groups (n = 4 samples, three fish per sample). A Microbial richness in the gut of fish in the Ctrl, Mild, and Severe groups (n = 4). Community richness was measured using the Chao1 index. B PCA analysis was performed to assess the gut microbiome communities of fish in the Ctrl, Mild, and Severe groups (n = 4). C Relative abundance of gut microbiota at the genus level in fish in the Ctrl, Mild, and Severe groups. D, E Proportions of potentially pathogenic (D) and facultatively anaerobic bacteria (E) in the Ctrl, Mild, and Severe groups fish. F Heatmap displays the relative abundance of pathogenic bacteria and probiotics in Ctrl, Mild, and Severe fish (Log₂ relative abundance). G Relative abundance of specific microbiota (Aeromonas, Shewanella, lactococcus, and Bacillus) in the Ctrl, Mild, and Severe groups fish