Question

Describe protozoan diseases in fishes.

Answer 1

Parasitic Diseases of Tropical and Ornamental Fish | The Fish ... Dinoflagellates of the genera Piscinoodinium (Oodinium), Amyloodinium, and Crepidoodinium are parasitic on freshwater and marine species of fish. These parasites cause a disease commonly called "velvet disease" or "rust disease" due to the reddish coloration the parasites impart to the affected body, fins or gills.