This document discusses methods for estimating marine primary productivity. It begins by defining key terms like primary productivity, gross primary productivity, and net primary productivity. It then describes several techniques used to measure these, including bottle incubations to measure oxygen concentration changes, incorporating radioactive carbon tracers, and fluorescence measurements. Other methods mentioned include using stable isotopes and oxygen/argon ratios, as well as remote sensing techniques like satellite imagery and lidar. Factors influencing primary productivity are also briefly outlined.