Abstract Thynnichthys thynnoides is one of common capture fish that inhabit the Lubuk Siam Lake. A study aims to assess growth and exploitation rates of that fish was conducted from November 2019 to March 2020. Fish was sampled once in 2 weeks for 3 months at 3 sampling points, using gill nets. Data were analyzed by an ELEFAN I method, FiSAT II ( FAO-ICLARM Fish Stock Assesment Tool) soft…