This zone is the uppermost layer of the ocean, which receives enough sunlight for photosynthesis to occur. The photic zone typically extends from the surface of the ocean to a depth of about 200 meters. It is home to a wide variety of marine organisms, including phytoplankton, zooplankton, fish, and marine mammals.
The photic zone is the most productive zone in the marine biome because it is where the majority of photosynthesis occurs. Photosynthesis is the process by which plants convert sunlight into chemical energy, which is then used to produce food. The phytoplankton in the photic zone are responsible for producing the majority of the organic matter in the ocean, which supports the entire marine food web.