Abstract This research was conducted in August-September 2020 at the Fish Hatchery and Breeding Laboratory, Faculty of Fisheries and Marine, Universitas Riau, Pekanbaru. This research aims to determine the effect of different washing solutions (milk, urea, formalin) on eggs adhesive, fertilization rate, hatching, and the survival of Patin catfish (P. hypophthalmus) larvae. This experimenta…