Unusual pathogenicity of a common metacercaria of fish.

The metacercaria of Posthodiplostomum minimum centrarchi Hoffman, 1958, is reported from an unusual host, Roccus saxatilis, from North Carolina. Although few dead or moribund fish were observed, there were many deformed fish, few of which survived. The metacercariae were in the musculature and orbit of the eye instead of in the usual location in the centrarchid hosts.