Scallop Protistan G
Category 2 (In Canada and of Regional Concern)
Common, generally accepted names of the organism or disease agent
SPG, Scallop protistan with ghosty appearance.
Scientific name or taxonomic affiliation
Unidentified protistan, possibly an amoeba.
British Columbia. Also in brood stock imported by Ireland from Japan.
Impact on the host
Infections usually light and associated with acute but focal inflammation that ulcerates when located close to the epithelium of the gut, gonadal duct, gill, or mantle.
Histology: A few ghosty looking protista (about 10-15 µm in diameter) within focal haemocyte aggregations.
Methods of control
No known methods of prevention or control.
Bower, S.M., J. Blackbourn, D.J.H. Nishimura and G.R. Meyer. 1990. Diseases of cultured Japanese scallops (Patinopecten yessoensis) in British Columbia, Canada. In: A. Figueras (ed.). Abstracts, Fourth International Colloquium on Pathology in Marine Aquaculture. 1721 September 1990, Vigo (Pontevedra), Spain, Instituto de Investigaciones Marinas-CSIC, Vigo, p. 67-68.
Bower, S.M., J. Blackbourn, G.R. Meyer and D.J.H. Nishimura. 1992. Diseases of cultured Japanese scallops (Patinopecten yessoensis) in British Columbia, Canada. Aquaculture 107: 201-210.
Bower, S.M., McGladdery, S.E., Price, I.M. (1994): Synopsis of Infectious Diseases and Parasites of Commercially Exploited Shellfish: Scallop Protistan G.
Date last revised: Fall 1994
Comments to Susan Bower
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