PROBLEM TO BE SOLVED: To provide a safer and more effective extermination method of ectoparasite that is parasitic on the body surface of fishes.SOLUTION: A method is provided for exterminating ectoparasite of marine product fishes and having suction cups or fixation cups by a low concentration hydrogen peroxide solution, the method that is characterized by withering or deforming the suction cups or the fixation cups of the ectoparasite by immersing the marine product fishes in the hydrogen peroxide solution of the concentration of 30-150 ppm for 15 minutes or more. The method for exterminating the ectoparasite of the marine product fishes and having the suction cups or the fixation cups is characterized in that at least the side surface of the net of a fish preserve is covered by a sheet to be brought into a state of holding the internal seawater, the hydrogen peroxide solution is charged into the seawater in the fish preserve by an amount configured so that an average concentration may become 30-150 ppm on the calculation, and then the sheet is removed after 15 minutes or more elapse.SELECTED DRAWING: Figure 1【課題】より安全で効果が高い魚類の体表に寄生する外部寄生虫の駆除方法を提供する。【解決手段】 海産魚類を30ppm～150ppmの濃度の過酸化水素水に15分間以上浸漬させて外部寄生虫の吸盤又は固着盤を萎縮又は変形させることを特徴とする、低濃度過酸化水素水により海産魚類の吸盤又は固着盤を有する外部寄生虫を駆除する方法。生け簀の網の少なくとも側面をシートで被い、内部の海水が保持される状態にして、生け簀内の海水に過酸化水素水を計算上平均濃度が30ppm～150ppmになる量投入し、15分間以上経過後、シートを除去することを特徴とする海産魚類の吸盤又は固着盤を有する外部寄生虫を駆除する方法である。【選択図】 図１
