Characterization of Atypical Aeromonas salmonicida Isolated from an Epizootic Ulcerative Disease in Carp (Cyprinus carpio).

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  • Kaku Yoshiko
    Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Yamada Yoshiyuki
    Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Wakabayashi Hisatsugu
    Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo

Bibliographic Information

Other Title
  • 最近流行している穴あき病様疾病のコイから分離された非定型Ａｅｒｏｍｏｎａｓ　ｓａｌｍｏｎｉｃｉｄａの性状
  • サイキン リュウコウ シテ イル アナアキビョウ ヨウ シッペイ ノ コイ カラ ブンリ サレタ ヒテイケイ Aeromonas salmonicida ノ セイジョウ

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Description

Since 1996, an epizootic ulcerative disease has affected both coloured-and common carp in Japan. We isolated atypical Aeromonas salmonicida from ulcerative lesions in the skin of diseased fish. It took more than 5 days for the isolates to make visible colonies on heart infusion agar at 18deg;C. All isolates were Gram-negative, facultatively anaerobic, non-motile, short rods, which reacted positively to rabbit anti-A. salmonicida subsp. salmonicida ATCC14174 serum by fluorescent antibody technique. However, the isolates differed from typical A. salmonicida in the following characters : coloured carp isolates were negative in the catalase test, and common carp isolates were negative in the oxidase test. Sequence analysis of 16S rRNA genes indicated that they could be identified as atypical A. salmonicida, and that coloured carp isolates differed in only one base of the sequences from common carp isolates. Subcutaneous injections of common carp with a representative strain of each type confirmed its virulence in producing ulcerative lesions on the skin.

Journal

  • Fish Pathology

    Fish Pathology 34 (3), 155-162, 1999

    The Japanese Society of Fish Pathology

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