Lubuk Siam and Pinang Dalam lakes are the habitats of baung fish (H. nemurus) and selais fish (O. hypophthalmus) and these fish have high economic value. This study aims to know the concentration of Cd and Cr heavy metals in water, sediment, and fish organs (skin, kidney, liver) in both of fish. Water sample, sediments, and two types of fish were collected and preserved, extracted acids th…