The illuminated region of a water body. In ecological usage its photosynthetically usable part is often identified with the euphotic zone; the operational light threshold must be stated.
The upper water interval with sufficient light for substantial photosynthesis. A common operational lower boundary is the euphotic depth at 1% of surface photosynthetically active radiation.
The depth of a chosen light threshold, commonly 1% of just-below-surface photosynthetically active radiation. It depends on spectral attenuation and is not a universal species-specific compensation depth.
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The photic zone, also known as the euphotic zone, refers to the upper layer of a body of water, typically the ocean or a large lake, where there is sufficient sunlight for photosynthesis to occur. This zone generally extends from the surface down to a depth of about 200 meters (approximately 656 feet), although the exact depth can vary depending on factors such as water clarity, latitude, and season.