Mangrove leaves (Rhizophora apiculata) contain flavonoid compounds, terpenoids,steroids, saponins, and tannins which function as antibacterial and can improve fish health. This research was carried out in August to October 2019. This research purpose was to know the proper dose of mangrove leaf (R. apiculata) added to the feed to improve fish health as seen from total leukocytes, leukocyte diff…