ABSTRACT Harumanis mango (Mangifera indica L.) is a natural ingredient that can be used as an immunostimulant because the content of the active compound are tannins, flavonoids, saponins and ascorbic acid. This study aims to to analyze the image of leukocytes of Siamese catfish fed with the addition of a harumanis mango seed solution and get the best dose of adding harumanis mango seed solut…