Muhammad Fauzi, Dahelmi Dahelmi, Indra J. Zakaria, Usman M. Tang
Diplocheilichthys pleurotaenia is one of native fish present in the Kampar River. This fish used to migrate to downstream area due to reproductive activities. The construction of the Koto Panjang Dam may hamper this activity and also divided the population into 2 groups, the upstream and downstream population. To understand the biological aspects of the fish in both populations and its relationship to the presence of the dam, this study has been conducted from November 2011 to August 2012. The fish was sampled in the Kampar River, in the upstream and downstream of the Koto Panjang Dam. The fish was captured using gill nets monthly for a ten months period. The number of fish captured in the upstream was 7, while that of of the downstream was 228. The sex ratio of the fish is almost balance. The fish from both population shown similar reproductive pattern, there are mature males and females in April and there is no fish caught in May due to reproductive purposes migration. The reproductive activity of the upstream fish is unsucceed as there is no single small fish found. The rarity and the lack of small fish in the upstream population is strongly related to the failure of reproduction due to the construction of the Koto Panjang Dam.