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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.
The pelagic zone refers to the open ocean, away from the shore. Depending on depth, the pelagic zone varies widely in amount of sunlight, temperature, and pressure. This ocean habitat is home to a vast array of marine organisms including plankton, large and small migratory fish, marine mammals and reptiles.