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Euphotic zone

In the ocean, the sunlit layer from the surface to the depth of 1% light level wherein most of the primary productivity takes place. The depth varies geographically and seasonally and can range from a few metres in turbid, highly productive waters near the shore to around 200 m in tropical waters. The ocean average is around 100 m. It is a zone with sharp gradients in illumination, temperature and salinity, and overlies the aphotic zone. It is also known as the photic zone.

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