Early developmental stages of a protozoan parasite, Marteilioides chungmuensis (Paramyxea), the causative agent of the ovary enlargement disease in the Pacific oyster, Crassostrea gigas

Naoki Itoh, Hideki Komiyama, Noriyuki Ueki, Kazuo Ogawa

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

A paramyxea, Marteilioides chungmuensis, causes the irregular enlargement of the ovary in the Pacific oyster, Crassostrea gigas in Korea and Japan. The knowledge about the life cycle of the parasite has been limited to the sporulation stages within the oocyte of oysters. In this study, we used the parasite-specific DNA probes and electron microscopy to experimentally infected oysters in a field and successfully clarified early developmental stages of the parasite. The parasite invaded the oysters through the epithelial tissues of the gills, mantle and labial palps. Extrasporogony repeatedly occurred in the connective tissues by binary fusion. The inner cell of the extrasporogonic stage migrated into the gonadal epithelium, invaded the oocyte to start sporulation.

Original languageEnglish
Pages (from-to)1129-1135
Number of pages7
JournalInternational Journal for Parasitology
Volume34
Issue number10
DOIs
Publication statusPublished - 2004 Sep 1

Keywords

  • Crassostrea gigas
  • Extrasporogony
  • Marteilioides chungmuensis
  • Ovarian parasite
  • Pacific oyster
  • Paramyxea

ASJC Scopus subject areas

  • Parasitology
  • Infectious Diseases

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