Abstract Fish that live in the area that is polluted by heavy metal such as Pb may accumulate that metal in their body. To understand the Pb content in the water and in the N. notopterus obtained from the Sail river, a research has been conducted in February 2018. There were 3 stations, in the upstream (St I), in the middle area of the river (St II) and in the downstream (St III). Samplings …