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Alternatively, marine habitats can be divided into pelagic and demersal habitats.
Pelagic habitats are found near the surface or in the open water column, away from the bottom of the ocean.
Demersal habitats are near or on the bottom of the ocean.
An organism living in a pelagic habitat is said to be a pelagic organism, as in pelagic fish.
Similarly, an organism living in a demersal habitat is said to be a demersal organism, as in demersal fish.
Pelagic habitats are intrinsically shifting and ephemeral, depending on what ocean currents are doing.

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