black grub

black grub
black spots in the skin of fishes caused by metacercariae of such trematodes as Uvilifer ambloplitis, Cryptocotyle lingua and others. Also called black-spot disease, q.v

Dictionary of ichthyology. 2009.

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  • black-spot disease — the encysted intermediate, metacercarial life history stage of a strigeid trematode (Uvulifer ambloplitis, and also Cryptocotyle lingula) found in a fish s skin, gills and eyes. The skin develops black to brown pigment over the cysts forming the… …   Dictionary of ichthyology

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