The research was conducted from Mei to September 2015 in the Laboratory of Parasitic Diseases of Fish Faculty of Fisheries and Marine Science, University of Riau. The purpose of this reseach was to knowing the addition of flour noni (Morinda citrifolia L) on feed to change the phagocytic activity, total of erythrocytes and hemoglobin of tilapia (Oreochromis niloticus) infected Streptococcus ini…