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Screening and identification of lactic acid bacteria with antimicrobial abilities for aquaculture pathogens in vitro

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Abstract

This study aimed to evaluate the antibacterial properties of nine lactic acid bacterial strains. The agar diffusion method (Oxford cup method) was used to assess the antimicrobial activity against pathogenic bacteria in aquaculture. The results showed that all selected strains inhibited the growth of Photobacterium damsel, Vibrio alginolyticus, Listonella anguillarum, Edwardsiella ictaluri, Aeromonas hydrophila, V. arahaemolyticus, Edwardsiella tarda and V. harveyi, but did not inhibit the growth of Metschnikowia bicuspidata. Among these strains of lactic acid bacteria, r1 was selected for its obvious antibacterial activity against eight kinds of pathogenic bacteria by 96-well plate method. Its inhibitory rate reached 96%, and it could inhibit the growth of six pathogenic bacteria at 121 ℃, 20 min and pH 3.5–4.0. It was identified as Lactiplantibacillus plantarum by morphological observation and 16S rRNA sequencing analysis. Because strain r1 was isolated from culture ponds and exerted strong inhibitory effects on pathogenic bacteria, it holds potential as an agent to prevent and control infectious diseases in aquaculture. This study provides a foundation for the development and utilization of probiotics in aquaculture.

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Acknowledgements

The authors are grateful to Doctor Xu Xiaoli of The Institute of Tianjin Fisheries Research for providing the pathogenic bacteria in aquaculture, for conducting this study.

Funding

This work was supported by the Science and Technology Demonstration Project of Major Special Projects and Engineering Projects (17ZXYENC00070).

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FZ analyzed the formal data and wrote original draft. KZ performed the investigation and methodology. FX designed the experiment, reviewed and edited the manuscript. QZ conducted supervision. All authors read and approved the final manuscript.

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Correspondence to Fengxing Xie.

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Communicated by Erko Stackebrandt.

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Zhang, F., Zhou, K., Xie, F. et al. Screening and identification of lactic acid bacteria with antimicrobial abilities for aquaculture pathogens in vitro. Arch Microbiol 204, 689 (2022). https://doi.org/10.1007/s00203-022-03285-y

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  • DOI: https://doi.org/10.1007/s00203-022-03285-y

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