Pathogenicity and histopathology of an unusually intense infection of white grubs (Posthodiplostomum m. minimum) in the fathead minnow (Pimephales promelas).
A massive infection of metacercariae, particularly of the white grub (Posthodiplostomum m. minimum), was found in fathead minnows (Pimephales promelas) taken in November, 1979 from a commercial baitfish farm in Missouri. More than 2000 metacercariae were found in one fish 6 cm long. Low-grade mortality was occurring, and histologic sections showed that an intensive inflammatory response had resulted from the infection. The body cavity also contained a large volume of ascitic fluid with many blood cells, of which 92% were leucocytes. Moderate numbers of metacercariae caused a lesser inflammatory response.
D000818:Animals; D002347:Carps; D003530:Cyprinidae; D005393:Fish Diseases / Q000469:parasitology / Q000473:pathology*; D007422:Intestines / Q000473:pathology; D008099:Liver / Q000473:pathology; D013045:Species Specificity; D014200:Trematoda / Q000472:pathogenicity*; D014201:Trematode Infections / Q000469:parasitology / Q000473:pathology / Q000662:veterinary*