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Aquaculture Environment Interactions

    AEI prepress abstract   -  DOI: https://doi.org/10.3354/aei00382

    Effect of Bellamya purificata on organic matter degradation in surface sediment as revealed by amino acids

    Yiran Hou, Bing Li, Jiawei Luo, Chengfeng Zhang, Jie He, Jian Zhu*

    *Corresponding author:

    ABSTRACT: The accumulation of organic matter (OM) in the sediment of aquaculture ponds is a potential threat for aquaculture ecosystems and the surrounding environment. The snail Bellamya purificata is a potential bioremediation species which may solve this problem. In order to investigate the effects of B. purificata on OM degradation in surface sediment, an 84 d experiment was carried out. The experimental setup entailed 6 glass tanks which were divided into B. purificata treatment and control (BPT and CON, respectively). At the end of the experiment, significantly lower degradation index (DI), reactivity index (RI), and carbon normalized yield of amino acids (THAA-C%) were observed in BPT compared with the CON, namely −0.47 ± 0.43, 1.24 ± 0.01, and 6.24 ± 0.44, respectively. BPT showed higher oxidation-reduction potential (ORP) and bacterial 16S rRNA gene copies than the CON. Total organic carbon (TOC), total nitrogen (TN), and total hydrolysable amino acid (THAA) concentrations in the BPT were 1.83 ± 0.10%, 0.07 ± 0.01%, and 22.38 ± 0.53 μmol g-1, all of which were significantly lower than the CON. A clustered heat-map showed the final BPT as one separate category, which was different from the initial samples and the final CON. Overall, the B. purificata could effectively facilitate OM degradation through promoting oxidation-reduction potential and bacterial populations, and finally inhibiting the OM accumulation in sediment, which provided references for applying B. purificata to reduce the risk of endogenous pollution caused by OM accumulation in aquaculture pond.