A parasitological survey of the American lobster Homarus americanus from the Northumberland Strait, southern Gulf of St. Lawrence

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Abstract
A parasitological survey was conducted on 233 lobsters from the Northumberland Strait [Canada]. Routine macroscopic and histological examinations revealed that 93% were infected by 1 or more parasites. Parasites detected included a spiruroid nematode, probably genus Ascarophis, an unidentified flagellate, the annelid Histriobdella homari and the sporozoan Porospora gigantea. The latter was by far the most common. Highest parasite frequencies occurred in lobsters whose carapace measurements exceeded 50 mm.

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