Kampar River and Tapung River are the flood plain river ecosystem located in Riau Province. This research is a morphometric study (Belodontichtys dinema) which aims to know the difference of morphometric character of male and female in Mentulik and Bencah Kelubi. The method used in this research is survey method. The sample used amounted to 120 fishes consisting of 60 fishes, 30 males dan 30 fe…