Abstract
AbstractAn adult male blue shark Prionace glauca was caught in June 2002 by recreational fisherman off Long Island, New York. The shark was necropsied dockside and all major tissues were collected into elasmobranch formalin and processed for light microscopy. Macroscopic lesions included a polyp arising from the mucosa of the gastric body and numerous larval cestodes Hepatoxylon trichiuri attached to the hepatic capsule. The gastric polyp was a slender, pedunculated growth with a mucosa similar to the remaining gastric lining except for a few pinpoint areas of erosion and hemorrhage. Microscopically, the growth was classified as a well‐differentiated adenomatous polyp. Histological evidence suggested minimal chronic gastritis, but special stains failed to reveal intralesional microorganisms, and no histological evidence of viral infection was detected. No other significant microscopic lesions were detected. This is the first literature report of a gastric polyp in a shark and in fishes in the class Chondrichthyes.
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