ABSTRACT Lemon (Citrus limon) is a fruit that can be used as an antimicrobial/antibacterial because it contains secondary metabolites, such as flavonoids, tannins, terpenoid, and asam sitrat. Edwardsiella tarda was pathogenic bacteria that can cause diseases in cultured fish. This research was conducted from Mei to Juli 2019, at Parasites and Fish Disease Laboratory, Faculty of Fisheries and…