Susceptibility of Japanese Medaka to <i>Edwardsiella piscicida</i> and <i>E. anguillarum</i> Isolated from Aquacultured Fish

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  • Nishihara Aki
    Interdisciplinary Graduate School of Agriculture and Engineering, University of Miyazaki
  • Sumiyoshi Takechiyo
    Graduate School of Agriculture, University of Miyazaki
  • Arakawa Koushiro
    Faculty of Agriculture, University of Miyazaki
  • Morimoto Natsuki
    Faculty of Agriculture, University of Miyazaki Research Fellowship for Young Scientists, Pathology Division, Nansei Main Station, Aquaculture Research Department, Fisheries Technology Institute, Japan Fisheries Research and Education Agency
  • Yasumoto Shinya
    Department of Applied Aquabiology, National Fisheries University, Japan Fisheries Research and Education Agency
  • Kondo Masakazu
    Department of Applied Aquabiology, National Fisheries University, Japan Fisheries Research and Education Agency
  • Kono Tomoya
    Graduate School of Agriculture, University of Miyazaki Faculty of Agriculture, University of Miyazaki
  • Sakai Masahiro
    Graduate School of Agriculture, University of Miyazaki Faculty of Agriculture, University of Miyazaki
  • Hikima Jun-ichi
    Graduate School of Agriculture, University of Miyazaki Faculty of Agriculture, University of Miyazaki

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Other Title
  • Susceptibility of Japanese Medaka to Edwardsiella piscicida and E. anguillarum Isolated from Aquacultured Fish

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Abstract

<p>Edwardsiella bacteria infect Japanese medaka Oryzias latipes; however, the difference in susceptibility between E. piscicida and E. anguillarum is unknown. ​In this study, we performed challenge tests with medaka using four Edwardsiella strains, which were difficult to be identified by specific primers. ​The four strains were reclassified as three E. piscicida strains and one E. anguillarum strain using phylogenetic analysis. ​The immersion challenge demonstrated that medaka were more susceptible to E. piscicida than to E. anguillarum. ​Increases in the bacterial copy number in the infected medaka kidneys were correlated with the worsening of the external symptoms. ​Medaka is considered a valuable model organism for understanding the etiology of edwardsiellosis.</p>

Journal

  • Fish Pathology

    Fish Pathology 58 (4), 175-179, 2023-12-15

    The Japanese Society of Fish Pathology

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