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Aquaculture Environment Interactions

    AEI prepress abstract   -  DOI: https://doi.org/10.3354/aei00479

    Accumulation of microcystins (MCs), bacterial community composition and mlrA gene abundance in shrimp culture ponds

    Xinyu Wang, Wei Dai, Xiangdong Bi*, Xiaolei Zhang, Dajuan Zhang

    *Corresponding author:

    ABSTRACT: Cyanobacteria blooms occur frequently in low-salinity shrimp culture ponds. To provide useful information for the potential harm and in situ biodegradation pathway of MCs in these ponds, we investigated accumulation of MCs in shrimp hepatopancreas and sediments, bacterial community composition and mlrA gene abundance in intestines and sediments in 11 Litopenaeus vannamei culture ponds from 9 farms in China. MCs (MC-LR, MC-RR and MC-YR) accumulated in shrimp hepatopancreas and sediments in each sampled pond. Higher bacteria richness and diversity were observed in sediments than in intestines. Two MC-degrading genera (Sphingobium and Roseomonas) were detected in intestine bacterial community, and three MC-degrading genera (Sphingobium, Rhizobium and Acinetobacter) were detected in the sediment bacterial community. The mlrA gene was easier to detect and more abundant in shrimp intestines than in sediments. These results suggest that there was potential MCs hazard in shrimp culture ponds, where the biodegradation pathway in shrimp intestines seemed to be more dependent on the mlr pathway than in the sediments.