Kidney Coccidia of Oysters
Category 1 (Not Reported in Canada)
Common, generally accepted names of the organism or disease agent
Oyster kidney coccidians.
Scientific name or taxonomic affiliation
Unidentified species of coccidia.
Impact on the host
Infected kidney epithelial cells become extremely hypertrophied. Heavy infections may cause serious kidney damage but associated mortalities have not been reported in oysters.
Squash Preparations: Preliminary diagnosis can be made on the presence of large mature macrogamonts in squashes of kidney tissues.
Histology: Various stages of the coccidia can be observed in the cytoplasm of kidney epithelial cells.
Methods of control
No known methods of prevention or control.
Lauckner, G. 1983. Diseases of Mollusca: Bivalvia. In O. Kinne [ed.]. Diseases of Marine Animals. Volume II: Introduction, Bivalvia to Scaphopoda. Biologische Anstalt Helgoland, Hamburg. p. 548-549.
Bower, S.M., McGladdery, S.E., Price, I.M. (1994): Synopsis of Infectious Diseases and Parasites of Commercially Exploited Shellfish: Kidney Coccidia of Oysters.
Date last revised: Fall 1994
Comments to Susan Bower
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