Tanjung Balam lake is an oxbow lake located around the Kampar River and receive water from that river. A research aims to understand the primary productivity based on oxygen method and the thropic state based on carbon concentration (gC/m3/day) was conducted in June-July 2019. There were three sampling stations, Station 1 (inlet), Station 2 (in the middle lake) and Station 3 (outlet). In each …