Abstract This research was conduted on November - December in Fish Hatchery and Breeding Laboratory, Faculty of Fisheries and Marine University of Riau. The aim of this research was to know The Effect of Replacement of Water Flea with Tubifex sp in the Maintanance of Larvae Ingir-Ingir (Mystus nigriceps). The method in this research was an experimental method with Completely Randomized Des…