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      Isolation of Enterococcus faecium with Feeding Attractant Function from Pacific White Shrimp ( Litopenaeus vannamei) Intestine

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          Abstract

          In the present study, we isolated the lactic acid bacterium strain SC-01 from Pacific white shrimp ( Litopenaeus vannamei) intestine. Using conventional and molecular methods, we identified the bacterium as Enterococcus faecium, and found it had the function of feeding attractant and could inhibit the development of Vibrio parahaemolyticus (zone of inhibition: 14 mm). The attractant effect of its fermentation broth is significantly better than that of the chemical attractant trimethylamine oxide (TMAO) ( P < 0.05), and is equivalent to that of dimethyl-beta-propiothetin (DMPT) based on the feeding behavior of shrimp. High performance liquid chromatography (HPLC) analysis suggested that inosine-5’-monophosphate (IMP) may be a component of the attractant. A biosecurity evaluation revealed a negative result in hemolytic assays, and no shrimp mortality was resulted from SC-01 fermentation broth challenge. Feeding trials (60 days) indicated that the SC-01 fermentation broth (viable counts: 5.7×10 9 cfu mL –1) could improve feed intake, weight gain rate (WGR) and specific growth rate (SGR), and decrease the count of Vibrio sp. in the intestine of shrimp.

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          Author and article information

          Journal
          JOUC
          Journal of Ocean University of China
          Science Press and Springer (China )
          1672-5182
          10 July 2020
          01 August 2020
          : 19
          : 4
          : 931-940
          Affiliations
          1Fisheries College, Ocean University of China, Qingdao 266003, China
          2Dean’s Office, Hainan Provincial Party School, Haikou 571100, China
          3School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
          Author notes
          *Corresponding author: MA Qingshan, E-mail: horsegreenhill@ 123456163.com

          # These authors contributed equally to this work.

          Article
          s11802-020-4342-3
          10.1007/s11802-020-4342-3
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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          Self URI (journal-page): https://www.springer.com/journal/11802

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