BLACKSPOT DISEASE
black-spot disease: translation
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 characteristic spots. Usually harmless to fish unless very severe, but unsightly and commercially a problem. Herons and kingfishers are the definitive host and snails are an intermediate host. See also black grub