The dynamics of bacterial community in a polyculture aquaculture system of Penaeus chinensis, Rhopilema esculenta, and Sinonovacula constricta

Polyculture with Chinese shrimp Penaeus chinensis, jellyfish Rhopilema esculenta, and razor clam Sinonovacula constricta (S.J.R) is a common aquaculture systems in Dandong, China. Investigation on the composition and function of microbial communities and their relationship to environmental factors in aquaculture systems has crucial implications. Therefore, the sequencing of 16S rRNA gene were applied to profile the bacterial community composition of water and sediment in S.J.R polyculture system in present study. Proteobacteria was the dominant phylum in S.J.R polyculture ponds following with Actinobacteria and Bacteroidetes in water, in contrast, more diverse phyla were detected in sediments. Water temperature, pH and dissolved oxygen determined the bacterial community composition in the S.J.R polyculture systems. Specially, Planktomarina, PS1 clade, Candidatus Aquiluna, and Fibrobacteres, which can resist the phytoplankton blooms or cellulose degradation, were more abundant in water at the early stage of cultivation in the S.J.R polyculture system. Moreover, the functions of bacterial communities in water were mainly associated with cell communication mediated, while the functions related to basal metabolism were enriched in sediments. The findings of this study allowed us to better understand the bacterial community in the S.J.R polyculture system and accumulated data for the improvement of cultural management.