Mangrove oil (Rhizophora apiculata) is one of the natural ingredients that are potentially as antibacterial. Mangrove oil (R. apiculata) leaves contains compounds such as flavonoids, phytochemicals, these Terpenoids, tannins, saponins and is antibacterial and antimicrobial. This research was carried out in September 2018 up to March 2019 in the Laboratory of Fish Diseases and Parasites of …