Fig. 2

Bacterial community structure of the intestinal sample groups at the phylum level. Field and pond, intestinal bacteria in Chinese mitten crabs raised in the rice–crab co-culture system (n = 59) and aquaculture ponds (n = 20); female and male, female and male crabs (n = 40 and 39); Liaohe and Changjiang, two varieties of Chinese mitten crab (n = 39 and 40)