Abstract Trichopodus pectoralis or siamese gourami is one of the freshwater fish that inhabit the Tuok Tengah Lake. This study aims to determine the bioecology of the siamese gourami which includes the ecological factors of the abiotic environment, including temperature, brightness, pH, dissolved oxygen, free carbon dioxide, ammonia, nitrate and phosphate in Lake Tuok Tengah. The study was cond…