Detection of Mycobacterial Species in Koi Carp Juvenile Cultured in Earthen Ponds

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  • Machida Yuichiro
    Department of Marine Biosciences, Tokyo University of Marine Science and Technology
  • Matoyama Hisato
    Niigata Prefectural Inland Water Fisheries Experiment Station
  • Kishihara Tatsuya
    Niigata Prefectural Inland Water Fisheries Experiment Station
  • Sato Sho
    Niigata Prefectural Inland Water Fisheries Experiment Station
  • Sano Motohiko
    Department of Marine Biosciences, Tokyo University of Marine Science and Technology
  • Kato Goshi
    Department of Marine Biosciences, Tokyo University of Marine Science and Technology

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Abstract

<p>Mycobacteriosis caused by several mycobacterial species is often found in indoor pools where yearling koi carp are reared during the winter season in Niigata, Japan. ​In this study, we isolated several mycobacterial species from juvenile fish cultured in earthen ponds in August and October 2019. ​Further, antibody titers against two major causative species (Mycobacterium paragordonae and Mycolicibacterium sp. WS-type) rose not only in infected fish but in some individuals from which no bacterium was isolated. ​These data suggest that juvenile carp are infected in earthen ponds by autumn, the disease progresses, and subsequently the fish mortality occurs from winter to the next spring.</p>

Journal

  • Fish Pathology

    Fish Pathology 59 (1), 25-28, 2024-03-15

    The Japanese Society of Fish Pathology

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