Koto Panjang Reservoir is one of the reservoirs built by damming the flow of the Kampar Kanan and Batang Mahat Rivers, which stretches over 12,400 ha. A lot of nekton biodiversity species of nekton that found in this aquatic, in riverstream and in reservoir. One of nekton that found in inlet Koto Panjang reservoir is Sumatran River Sprat fish. This study aims to determine the distribution and a…