Jatropha curcas is a plant that contains active compounds such as saponins, flavonoids, polyphenols, and tannins as antifungals. This research was conducted in March to May 2024 at the Laboratory of Parasites and Fish Diseases, Faculty of Fisheries and Marine Sciences, Riau University. The aim of the study was to obtain the best dose of J. curcas leaf solution for the treatment of gourami eg…