Haplosporidiosis of the Pacific oyster, Crassostrea gigas

Carolyn S. Friedman, Deborah F. Cloney, Donald Manzer, Ronald Hedrick

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Haplosporidan parasites were observed in 10 100 spat and 1 171 adult Pacific oysters, Crassostrea gigas, reared in Matsushima Bay, Japan. Eight of the infected spat contained mild to severe plasmodial infections. The multinucleated plasmodia were 6-12 μm × 7-15 μm and were associated with an infiltration of hemocytes that occurred throughout the vesicular connective tissues of all infected oysters. Two oysters, one adult and one spat, contained advanced sporogonic infections. These were characterized by the presence of sporocysts and immature and mature operculated spores that measured 5.6-6.0 μm × 6.0-8.0 μm and were found exclusively within the digestive tubule epithelium. Electron microscopic examination revealed that mature spores contained a hinged operculum, striated and layered wall, spherule, single nucleus, and haplosporosome formative regions. Parasite morphology and infection pattern closely resemble that of Haplosporidium nelsoni, a pathogen of American oysters (C. virginica).

Original languageEnglish (US)
Pages (from-to)367-372
Number of pages6
JournalJournal of Invertebrate Pathology
Volume58
Issue number3
DOIs
StatePublished - Jan 1 1991

Fingerprint

Crassostrea gigas
spit
oysters
spore
parasite
Haplosporidium nelsoni
spores
infection
parasites
spherule
sporocysts (Protozoa)
Crassostrea virginica
Plasmodium
hemocytes
connective tissues
infiltration
epithelium
pathogen
immatures
electrons

Keywords

  • digestive tubule epithelium
  • haplosporidan
  • Pacific oyster Crassostrea gigas
  • plasmodia
  • spores
  • vesicular connective tissue

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Cite this

Haplosporidiosis of the Pacific oyster, Crassostrea gigas. / Friedman, Carolyn S.; Cloney, Deborah F.; Manzer, Donald; Hedrick, Ronald.

In: Journal of Invertebrate Pathology, Vol. 58, No. 3, 01.01.1991, p. 367-372.

Research output: Contribution to journalArticle

Friedman, Carolyn S. ; Cloney, Deborah F. ; Manzer, Donald ; Hedrick, Ronald. / Haplosporidiosis of the Pacific oyster, Crassostrea gigas. In: Journal of Invertebrate Pathology. 1991 ; Vol. 58, No. 3. pp. 367-372.
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