Information about the potential and utilization of fish resources and biodiversity in the Danau Panggang Peatlandarea (DPP) is still limited. Though theinformation is the most important component in the management of fisheries resources in freshwaters, especially peat swamps. Therefore, research in the DPP was carried out with the aim to determine the productivity of the waters using the approach of biomass and plankton abundance. The study was conducted from July 2017 to June 2018 at four sampling stations namely Settlement Station (PM), Non-Activity Station (TA), Pasture Station and Kalang Kerbau (PK), and Reservaat Station (RV). The results showed that the highest composition of phytoplankton divisionwas found in Chrysophyta at 48.50%, followed by Chlorophyta at 40.24% and finally Cyanophyta at 11.26%. Reservaat Station (RV) is a station with the highest phytoplankton biomass and abundance among other stations. The total abundance of phytoplankton in July 2017 to June 2018 ranged from 0.459 (± 0.336) -1.658 (± 2.123) x106 cellsl-1. The biomass concentration using the biovolume method ranged from 37.56 (± 25.84) -124.83 (± 89.96) mg m-3. The relationship between biomass and phytoplankton abundance is positively correlated with the coefficient of determination (R2) of 0.7582. From the research that has been carried out based on the production potential seen from the approach of biomass and phytoplankton abundance, the waters of the DPP belong to the productive category.Keywords: Biomass, Abundance, Phytoplankton, Productivity, DPP