Red tilapia (Oreochromis sp.) is one of the fishery commodities that has high economicpotential. This researchwas conducted from Juneto November2023 at the Laboratory of Parasites and Fish Diseases, Faculty of Fisheries and Marine Sciences, University of Riau, Pekanbaru. This study aims to determine the effect of providing feed containing probiotics on the hematology of red tilapia (Oreochromis…