Fish Health » Disease » Flukes (Gyrodactylus and dactylogyrus)

Flukes are the most commonly found parasite on koi and goldfish. High numbers can cause serious damage. Symptoms include flashing, gasping at the surface, frayed fins, and death. Most cases of ulcer disease are preceded by fluke infestations.

Treatment options for flukes are different for koi than they are for goldfish. For goldfish, see treatments #5 or #3. For Koi use treatments #6 or #3.