A genus of parasitic flatworms that attach to fish gills and skin using a circular disc with hooks, causing significant damage to aquaculture.
Scientific name from gyro- (Greek 'circle') and dactylus (Greek 'finger' or 'claw'). First described in the 19th century as a fish pathogen.
Single Gyrodactylus can become 8 individuals in one week—they're champion breeders, which is why one infected fish in a tank can wipe out an entire farm!
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