Aquatic photosynthesis is the process by which aquatic plants, algae, and some bacteria convert sunlight into energy. These organisms use chlorophyll, a green pigment, to capture light energy, which helps them transform carbon dioxide and water into glucose and oxygen. This process occurs in oceans, lakes, and rivers, where sunlight penetrates the water. In aquatic environments, photosynthesis is crucial for producing oxygen and serving as the foundation of the food web. Organisms like phytoplankton play a significant role in this process, as they are primary producers that support various marine life, including fish and zooplankton.