Perkinsus karlssoni n. sp. (Apicomplexa) in bay ...

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Title Perkinsus karlssoni n. sp. (Apicomplexa) in bay scallops Argopecten irradians
Author(s) S. E. McGladdery, Richard J. Cawthorn, B. C. Bradford
Journal Diseases of Aquatic Organisms
Date 1991
Volume 10
Issue 2
Start page 127
End page 137
Abstract In May 1989 a previously unidentified apicomplexan parasite was found in brookstock bay scallops Argopecten irradians from the east coast of Canada. Host tissue responses ranged from focal hemocytic encapsulation to the formation of abscesses containing necrotic hemocytes, parasites and ceroid. Bay scallops held for 6 mo in closed-system, artificial seawater at 22 to 24 degree C produced detectable infections much earlier than specimens grown in estuarine waters. Additionally, the lesions in experimentally held bay scallops showed less phagocytosis and encapsulation than those found in field-sampled bay scallops. Transmission of the parasite appears to be direct, having occurred during the brief exposure of the spat generation to infected broodstock. The parasite was undetectable in bay scallops under 7 to 10 mm in length (i.e. < 6 mo old) and only appeared in tissue sections after the scallops had been held for 6 wk in warm water. Thioglycollate culture of tissues from infected scallops-yielded zoosporangia which stained blue-black with Lugol's iodine. The name proposed is Perkinsus karlssoni .
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