2002 Volume 37 Issue 4 Pages 199-200
Treatment of supplied water with a high quality ultraviolet (UV) lamp was examined for prevention of scuticociliatosis of farmed juvenile Japanese flounder (Paralichthys olivaceus).In an examination for the ciliate-cidal effect of UV irradiation, scuticociliates showed low susceptibility to UV compared with fish pathogenic viruses or bacteria, the minimal killing dosage being 2.0×105μW·sec/cm2.UV treatment of supplied water to the tank was performed in a flounder farm in southern Hokkaido, where scuticociliatosis frequently occurred.It was revealed that the UV treatment at 3.0×105μW·sec/cm2 was effective to prevent scuticociliatosis.
