The aim of this research was to determine the effect of oodev on gonad maturation of Betok (Anabas testudineus Bloch). This research was conducted from December 2018 - February 2019 at Fish Hatchery and Breeding Laboratory, Fisheries and Marine Science Faculty Riau University. The method used is an ex-perimental method with a Completely Randomized Design (CRD) with four treatments and three rep…