Abstract Both lake of Lubuk Siam and Pinang Dalam are one of the lakes with semi-closed characteristics that are habitat for Selais fish (Kryptopterus lais) and Baung fish (Hemibagrus Nemurus). Both types of fish are of high economic value. The purpose of this study was to look at the heavy metal content in water, sediments, and fish organs (gills, muscles, and bones) of both types of fish…