Accumulating evidences have disclosed a tight connection between gut microbiota, obesity and host health. Thus, unraveling the ecological mechanisms that govern gut bacterial community assembly would guide the microbial modifications aimed at sustaining host health. However, most previous studies have focused on the underlying factors that determining the differences in gut bacterial communities between lean and obese animals and human. Here, this is the first attempt on a study that aims at jointly defining the phylogenetic clustering and interspecies interaction of the gut microbiota among shrimp BSW categories.