First report of three protozoan parasites (a haplosporidian, Marteilia sp. and Marteilioides sp.) from the Manila clam, Venerupis (=Ruditapes) philippinarum in Japan

Naoki Endo, Kazuo Momoyama, Kazuo Ogawa

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Recently, natural stocks of the Manila clam, Venerupis (=Ruditapes) philippinarum, have been drastically reduced in Japan. To clarify the reason for this decline in number, clams were sampled monthly from Yamaguchi and processed for histological observations, during which three protozoan parasites were discovered. Transmission electron microscopy revealed that these parasites were unidentified haplosporidian in the connective tissues, Marteilia sp. in the digestive gland and Marteilioides sp. in the oocytes. Histopathological observations suggest that Marteilia sp. and Marteilioides sp. were not pathogenic to the host. However, infection with a haplosporidian may have a negative impact on the clams. The prevalence of these parasites was low and further investigations should be undertaken to clarify their taxonomic status and establish any pathogenicity to clams.

Original languageEnglish
Pages (from-to)201-206
Number of pages6
JournalJournal of Invertebrate Pathology
Volume88
Issue number3
DOIs
Publication statusPublished - 2005 Mar 1

Keywords

  • Haplosporidia
  • Haplosporidian
  • Manila clam
  • Marteilia
  • Marteilioides
  • Paramyxea
  • Protozoan parasite
  • Venerupis (=Ruditapes) philippinarum

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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