Abstract The Kampar River is flown across the Mentulik Village and this area is inhabited by many fish species. This research aims to determine the diversity of fish species in the Kampar River, especially in the waters of Mentulik Village area. Samplings were carried out 4 times, once in 2 weeks, from October to November 2019. The fishes were captured using a gill net, fish hooks, scoop-n…