Abstract Lubuk Siam is one of the Oxbow lake in Kampar district. It is the habitat of Baung fish (Hemibagrus Nemurus) which has the high economic value. The purpose of this study was to determine the concentration of heavy metals (Cd and Cr) in the organs (gills, muscles, and bones) of Baung fish in this lake. The sample of fish from Lubuk Siam lake were collected and destructed according to t…