Pelagic (adjective)
Living in the open sea rather than in coastal or inland waters.
Pelagic (adjective)
Of or pertaining to oceans.
Pelagic (noun)
Any organism that lives in the open sea rather than in coastal or inland waters.
Benthic (adjective)
Pertaining to the benthos; living on the seafloor, as opposed to floating in the ocean.
Benthic (noun)
Any organism that lives on the seafloor
Wiktionary