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Early prediction of environmental deterioration in a coastal fish farming area using lactic acid bacteria as an indicator

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Abstract

We hypothesized that lactic acid bacteria (LAB) present in sediments at aquaculture sites can be employed as an indicator for the early prediction of deterioration, as the concentration of organic acids controls hydrogen sulfide production via sulfate-reducing bacteria. We selected two aquaculture sites with different acid volatile sulfide (AVS-S) values, St. OJ (average AVS-S = 0.24 mg S/g dry mud) and St. UM (average AVS-S = 1.16 mg S/g dry mud), which were less and critically deteriorated, respectively, and examined our hypothesis by performing a 3-year-long survey in Tanabe Bay, Wakayama Prefecture, Japan. In St. UM, the bacterial community showed positive correlations with AVS-S values and water contents. With AVS-S accumulation at the site, the abundances of LAB decreased below the detection limit, suggesting that LAB viable counts may be unsuitable for predicting early deterioration at sites with severe AVS-S accumulation. In St. OJ, the LAB viable counts, organic acid content, and AVS-S values increased after the beginning of sea bream aquaculture, and the bacterial community showed high correlations with the LAB counts, succinic and total organic acid concentrations, and the abundance of the class Bacilli. These on-site experiments indicated that LAB counts can be a reasonable indicator for evaluating deterioration in aquaculture sites.

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Acknowledgements

We appreciate the assistance provided by Ryodai Kawaguchi, Masashi Matsuoka, Ryo Wakai, Mitsuha Sugisaki, Yusuke Sugi, Masayoshi Miyamoto, and Kosuke Fujita in analyzing the samples. We are thankful to the members of the Laboratory of Microbiology, Faculty of Fisheries Sciences, Hokkaido University, for analyzing organic acid by HPLC. We are grateful to the late S. Miyashita, S. Masuma, T. Nasu, and the other staff members of the Aquaculture Research Institute, Kindai University, for their cooperation. This work was supported by JSPS KAKENHI [grant number 18K05798] and a 2016 Kindai University Research Enhancement Grant [grant number SR09] to EN.

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Correspondence to Erina Fujiwara-Nagata.

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Fujiwara-Nagata, E., Nakase, G., Kuroda, K. et al. Early prediction of environmental deterioration in a coastal fish farming area using lactic acid bacteria as an indicator. Fish Sci 90, 505–517 (2024). https://doi.org/10.1007/s12562-024-01756-3

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  • DOI: https://doi.org/10.1007/s12562-024-01756-3

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