ABSTRACT Anabas testudineus is one of the freshwater fishes that inhabit Tuok Tonga Lake. This study aims to determine the bioecology of betok fish which includes sex, length and weight, the relationship between length and weight, the level of maturity of the gonads, conditions and fecundity factors in Lake Tuok Tonga. This research was conducted on December 2021- January 2022. Fish sampli…