Gross primary productivity, chlorophyll, and quantum yield of photosynthesis data among phytoplankton in Deming Lake, Minnesota from 2023 - 2024. The PhytoPAM II (Walz) was used for all measurements. The data is comprised of taxa-specific gross primary productivity (GPP), chlorophyll, rapid light curves (RLCs), andquantum yields of photosynthesis across depths including the SCML and O2 max. This dataset contains two .csv files and a .zip folder with additional exported .csv files from the PhytoPAM II.