black-spot disease

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 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

Dictionary of ichthyology. 2009.

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