Ichthyophthira n. pl. : A division of copepod crustaceans, including numerous species parasitic on fishes.

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Taxonomy
fish, treatment, infected, white spots, parasite, Ichthyophthirius multifiliis, trophozoite, salt, life cycle, subclinically, outbreak, gills, Chemical treatments, Heat treatment, tank, medications, stresses, ciliates.

Defination from the web:
ichthyophthirius, which is useful if the fish is being medicated, because otherwise the parasites simply ... Life cycle and treatment of Ichthyophthirius in layman's terms. Disease profile for ich. Shirlie Sharpe's Your Guide to Freshwater Aquariums ...