Visceral Mycosis in Ayu Plecoglossus altivelis Larvae Caused by Pythium flevoense

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  • Miura Masayuki
    Yamanashi Prefectural Fisheries Technology Center
  • Hatai Kishio
    Division of Fish Disease, Nippon Veterinary and Life Science University
  • Tojo Motoaki
    Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • Wada Shinpei
    Division of Fish Disease, Nippon Veterinary and Life Science University
  • Kobayashi Sakura
    Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • Okazaki Takumi
    Yamanashi Prefectural Fisheries Technology Center

Bibliographic Information

Other Title
  • アユ仔魚に発生したPythium flevoenseによる内臓真菌症

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Description

A visceral mycosis occurred in ayu Plecoglossus altivelis larvae at Yamanashi Prefectural Fisheries Technology Center, Japan, in 2007 and 2008. Cumulative mortalities due to the disease were 19-33%. Most diseased fish were characterized by the opaque abdomen. Abundant non-septate hyphae with a width of approximately 5 μm were observed in the opaque areas. Fungi isolated from diseased fish were all identified as Pythium flevoense based on the morphological characteristics and sequence analysis of the 5.8S rDNA and adjacent ITS regions. Histopathological examinations showed that non-septate hyphae were present in the airbladder, kidney, intestine, pancreas, spleen, abdominal cavity, musculature and spinal cord. Heavy hyphal propagation in the airbladder and rhexis of the organ suggested that accidental ingestion of P. flevoense into the airbladder was the prime cause of this disease.

Journal

  • Fish Pathology

    Fish Pathology 45 (1), 24-30, 2010

    The Japanese Society of Fish Pathology

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