Gut microbiota plays important role in the health and growth of host fish,the study was conducted to investigate the gut microbiota of juvenile and early young grouper Epinephelus coioides.Standard isolation and characterization procedures in combination with 16S rRNA gene sequence analysis were used to study the gut microbiota of 40 d juvenile and 70 d young grouper.The results showed that seven species existed in the gut of both groups of fish,i.e.Vibrio parahaemolyticus,Vibrio harveyi,Bacillus pumilus,Ac...