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The pelagic zone can be thought of in terms of an imaginary cylinder or water column that goes from the surface of the sea almost to the bottom. Conditions differ deeper in the water column; the pressure increases, the temperature drops and less light penetrates.he pelagic zone can be contrasted with the benthic and demersal zones at the bottom of the sea. The benthic zone is the ecological region at the very bottom of the sea.
By Jennifer Kennedy. Pelagic Zone Background: The open ocean, or pelagic zone, is the area of the ocean outside of coastal areas, and where youâll find some of the biggest marine life species. The sea floor (demersal zone) is not included in the pelagic zone. Different Zones in the Open Ocean: The pelagic zone is separated into several subzones depending on water depth: 1  Epipelagic zone (ocean surface to 200 meters deep).