Spinal curvature of cultured Japanese mackerel Scomber japonicus associated with a brain myxosporean, Myxobolus acanthogobii

Hiroshi Yokoyama, Mark A. Freeman, Naoki Itoh, Yutaka Fukuda

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Skeletal deformities were found in the cultured Japanese mackerel Scomber japonicus. External and radiographical observations showed the deformed fish to exhibit a dorso-ventral spinal curvature (kyphosis) without fracture or dislocation of the vertebrae. Numerous myxosporean cysts, ca. 0.3 to 1.0 mm in diameter, formed in the 4th ventricle, the cavity of the optic tectum, the surface of the olfactory lobe and bulb, the optic lobe and the inferior lobe of the brain. Spore morphology and molecular analysis of the small subunit ribosomal RNA gene sequence identified the myxosporean parasite as Myxobolus acanthogobii, a parasite which also causes scoliosis in yellowtail Seriola quinqeradiata. Histopathological observation showed that the myxosporean cysts were encapsulated within the host's collagenous layer although some had disintegrated to disperse mature spores into the cranial cavity. Occasionally, lymphocytic infiltration and local granulomatous inflammation were found to be associated with spore dispersion.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalDiseases of Aquatic Organisms
Volume66
Issue number1
DOIs
Publication statusPublished - 2005 Aug 9

Keywords

  • Mackerel
  • Myxobolus
  • Myxozoa
  • Parasite
  • Scomber japonicus
  • Spinal curvature

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science

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