ABSTRACT The main problem in carp cultivation is the occurrence of bacterial infection caused by Aeromonas hydrophilla so that it can cause death. Prevention can be done by giving phytoimmunostimulants derived from mango leaves (M. indica), noni leaves (M. citrifolia), and guava leaves (P. guajava). The purpose of this study was to determine the effect of phytoimmunostimulants on leukocyte dif…