Infective larvae of Dioctophyma renale were found in the hypaxial musculature of pumpkinseed (Lepomis gibbosus L.) from three lakes in Algonquin Provincial Park, Ontario, Canada. This represents the first report of D. renale in centrarchid fish. In the three lakes surveyed prevalence and mean intensity ranged from 5 to 23% and one to two larvae respectively. Larvae elicited a mild granulomatous reaction in pumpkinseed. Two ferrets were each given five larvae from pumpkinseed. Adult D. renale were recovered from the right kidney capsule of ferrets 108 and 134 days post-infection. An opening in the ventral surface of the right kidney capsule was present in one ferret. Chronic peritonitis was associated with eggs of D. renale and cellular debris which probably entered the abdominal cavity from the right kidney capsule.
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