サケ科魚類の粘液胞子虫性眠り病 : 神経組織寄生Myxobolus属の新種M. murakamiiの記載

DOI 日本農学文献記事索引 Web Site 参考文献40件
  • Urawa Shigehiko
    Research Division, National Salmon Resources Center, Fisheries Research Agency North Pacific Anadromous Fish Commission
  • Iida Yoshisuke
    Fisheries and Marine Technology Center, Hiroshima Prefectural Technology Research Institute
  • Freeman Mark A.
    Institute of Biological Sciences, University of Malaya
  • Yanagida Tetsuya
    Department of Parasitology, Asahikawa Medical College
  • Karlsbakk Egil
    Department of Biology, University of Bergen
  • Yokoyama Hiroshi
    Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo

書誌事項

タイトル別名
  • Morphological and Molecular Comparisons of Myxobolus spp. in the Nerve Tissues of Salmonid Fishes with the Description of Myxobolus murakamii n. sp., the Causative Agent of Myxosporean Sleeping Disease

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抄録

Myxosporean sleeping disease is known to cause severe mortality of masu salmon Oncorhynchus masou masou and amago salmon O. masou ishikawae farmed in Hiroshima, western Japan. Diseased fish become unable to swim, and shortly afterwards die on the bottom of the pond. The causative agent is Myxobolus sp. which infects the peripheral nerves of salmon, but its definitive identity and taxonomic status have been unresolved for years. We investigated interspecific relationships among Myxobolus spp. infecting the nerve tissues of salmonid fishes from Japan, Europe and North America. Our morphological comparisons revealed that myxospores varied in spore shape, and separated into two types: spherical (typically M. neurobius, M. kisutchi and M. neurotropus) or pyriform (typically M. arcticus and M. fryeri). Molecular analysis based on small subunit ribosomal DNA (SSU rDNA) demonstrated that Myxobolus sp. from the lateral line nerve of amago salmon with sleeping disease in Hiroshima was genetically distinct from other myxosporean species, but had 99.5% sequence similarity to Myxobolus sp. from the lateral line nerve of subclinical masu salmon in the Mena River, Hokkaido. Both myxosporeans had similar spherical-type spores. Consequently, Myxobolus sp. from the lateral line nerve of both amago and masu salmon in Hiroshima and Hokkaido are considered to be a new species, and described as M. murakamii n. sp.

収録刊行物

  • 魚病研究

    魚病研究 44 (2), 72-80, 2009

    日本魚病学会

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