Abstract
A laboratory-held summer flounder (P. dentatus) became moribund and presented gross ulcerative and hemorrhagic lesions, concomitant with a space-occupying lesion in the abdominal cavity and a prolapsed rectum. Edema, hemorrhage and necrosis of the intestine and edema of the stomach wall were noted upon post-mortem examination. Microscopic examination revealed large numbers of Cryptobia in the submucosa of the gut and in the liver.

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