Infection Dynamics of <i>Kudoa septempunctata</i> (Myxozoa: Multivalvulida) in Hatchery-produced Olive Flounder <i>Paralichthys olivaceus</i>

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  • Yokoyama Hiroshi
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Lu Meibi
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Mori Koh-ichiro
    National Research Institute of Aquaculture, Kamiura Branch
  • Satoh Jun
    National Research Institute of Aquaculture, Kamiura Branch
  • Mekata Tohru
    National Research Institute of Aquaculture, Kamiura Branch
  • Yoshinaga Tomoyoshi
    Graduate School of Agricultural and Life Sciences, The University of Tokyo

Bibliographic Information

Other Title
  • 種苗生産されたヒラメにおける粘液胞子虫ナナホシクドアKudoa septempunctataの感染動態
  • Infection Dynamics of Kudoa septempunctata (Myxozoa: Multivalvulida) in Hatchery-produced Olive Flounder Paralichthys olivaceus

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Description

Food poisoning of humans, caused by the ingestion of raw flesh of the olive flounder Paralichthys olivaceus infected with Kudoa septempunctata, has recently become a public health concern in Japan. The present study investigated the infection dynamics of K. septempunctata in two cohorts of olive flounder produced in a hatchery, where K. septempunctata infection was enzootic, by PCR assay and light microscopy. In less than 1-year-old juveniles of the 2011 cohort (hatched in February 2011), K. septempunctata was not detected in either June or July 2011 even by conventional PCR, but light microscopy detected a heavy infection (> 1 × 106 spores/g) in October 2011. In 2-year-old fish of the 2009 cohort (hatched in February 2009), the prevalence of infection varied from 30% to 90% from April to December 2011, although no clear pattern was observed in the fluctuation of prevalence and intensity. Fish-to-fish transmission of K. septempunctata was not possible orally or by cohabitation. To investigate the infection period and early development of K. septempunctata, uninfected fish were exposed monthly for 2 weeks to the seawater at the infected hatchery. The results indicated that the peak period of infection was July, and that K. septempunctata was detectable in the heart by quantitative PCR assay as early as 1 week post-exposure, then in the blood and somatic muscle at 2 weeks post-exposure.

Journal

  • Fish Pathology

    Fish Pathology 50 (2), 60-67, 2015

    The Japanese Society of Fish Pathology

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