Fig. 2

Co-occurrence network analysis of the core genera of grass carp gut microbiota. A The relative abundance of shared genera in the microbiota. B and C Co-occurrence network of core genera at weeks 1 and 3. D and E Co-occurrence network of microbiota at the phylum level at weeks 1 and 3. The connection strength threshold is Spearman’s r > 0.5, and correlation is considered as significant when p-value < 0.05. The size of the connection point represents the relative abundance of a specific microbe. Red lines indicate co-occurrence. Green lines indicate co-exclusion, and the thickness of the line shows the strength of the correlation. The dotted ellipse indicates a specific modular unit