To provide a parasite control method and a parasite control device capable of exterminating, reducing or preventing parasites before being infested.SOLUTION: A parasite control method includes a condensation step for irradiating light having a wavelength of 380nm or longer and 600nm or shorter from a light source 2, and a capturing step for capturing parasites by putting the parasites contained in the water into a capturing device. A parasite control device includes the light source 2 provided underwater, for irradiating light having a wavelength of 380nm or longer and 600nm or shorter, and the capturing device into which parasites contained in the water are put.SELECTED DRAWING: Figure 3【課題】寄生前の寄生虫を駆除、低減または予防する寄生虫防除方法および寄生虫防除装置を提供する。【解決手段】光源２から波長が３８０ｎｍ以上６００ｎｍ以下である光を照射する集光工程と、水に含まれる寄生虫を捕獲装置に入れることで捕獲する捕獲工程と、を備える寄生虫防除方法。また、水中に設けられ、波長が３８０ｎｍ以上６００ｎｍ以下である光を照射する光源２と、水に含まれる寄生虫を入れる捕獲装置と、を備える寄生虫防除装置。【選択図】図３
