The application belongs to the technical field of
aquaculture, and particularly relates to application of protochloris vulgaris in preparation of products with activity of inhibiting fish parasites. Specifically, the application discloses application of protochloris vulgaris in preparation of products with activity of inhibiting fish parasites and / or reducing
infection rate of fish parasites. Protochloris vulgaris has a significant killing effect on fish parasites, can significantly reduce the
infection rate of fish to fish parasites, and can promote the growth of fish. The protochloris vulgaris is used to inhibit fish parasites in the application, no chemical
drug residue is left, and the problems of
drug resistance and environmental
pollution caused by existing chemical repellents are effectively solved.