Method of expelling ectoparasites parasitic on breeding fish

The invention provides a method for expelling ectoparasites, which is suitable for expelling ectoparasites parasitic on breeding fish. According to the method for expelling ectoparasites parasitic on breeding fish, an electrolysis type ozone generating device is arranged in the proximity of a culturing farm. Then raw material water is electrolyzed by the electrolysis type ozone generating device to generate ozone water and the electrolytic ozone water is stored in a electrolytic ozone water tank. Breeding fish are put in the electrolytic ozone water tank so as to expel the ectoparasites of the breeding fish.