Effect on intestinal microbiota, bioaccumulation, and oxidative stress of Carassius auratus gibelio under waterborne cadmium exposure.

Cadmium (Cd) is a hazardous pollutant known to exert various toxic effects and other sublethal effects on aquatic organisms, and induce a variety of adverse effects on human health, and can be commonly found in environment. The aim of this study was to explore the effects of waterborne Cd exposure on the intestinal microbiota, and Cd accumulation and oxidative response in Carassius auratus gibelio (C. gibelio). The fish were exposed to waterborne Cd at 0, 1, 2, and 4 mg/L for 30 days. Waterborne Cd exposure resulted marked alterations in the composition of microbiota. At the genus level, Bacteroides, Aeromonas, Akkermansia, Acinetobacter, Chryseobacterium, Shinella, Cetobacterium and Bacillus were significantly changed in Cd groups. The results obtained indicate that Cd exposure significantly increased the bioaccumulation level of Cd and profoundly affected antioxidant enzyme including superoxide dismutase (SOD), catalase (CAT), glutathione (GSH), total antioxidant (T-AOC), malonaldehyde (MDA), and glutathione-S-transferase (GST). The present findings may provide a new framework for the role of gut microbiota in the response to environmental chemical contamination and in the pathogenesis of body disorders.