EFFECTS OF BLEACHING POWDER DISINFECTION FOR SOURCE WATER OF SHRIMP FARMING ON BACTERIAL COMMUNITY
Bleaching powder disinfection is a common practice of source water treatment for shrimp farming to effectively control the spread of pathogens.However,the disinfection can strongly disrupt the aquatic microbial community.At present,the response of bacterial community to bleaching powder have not yet been elucidated.We used bleaching powder in two concentrations(60 mg/L and 20 mg/L)to treat the source water,and analyzed the changes of water physicochemical factors,bacterial community compositions,pathogens,and antibiotic resistance genes(ARGs).Results show that after disinfection,the abundance of Bacteroidetes increased,and the abundance of Proteobacteria decreased significantly in the 60 mg/L group.However,the bacterial community compositions of the two groups recovered and tended to be consistent 3d later.Bacterial community structure and co-occurrence patterns of the source water were significantly changed by the disinfection.The 60 mg/L group showed a more potent inhibitory effect on pathogenic bacteria than 20 mg/L group did.Bleaching powder demonstrated selectivity in eliminating ARGs from source water,showing particular effectiveness against sul1,floR,cfr and tetQ.However,there was no significant difference in the impact on ARGs removal between the two concentration groups.Therefore,the bleaching powder concentration of 60 mg/L was proved a better choice for source water disinfection in shrimp farming.These findings provided valuable insights into the disinfection efficacy of different concentrations of bleaching powder from the perspective of bacterial communities,and offered a theoretical basis for the disinfection of source water to the benefit of shrimp aquaculture.
万方数据
维普
