I was reminded of certain kinds of pelagic birds that move at ease in the air or on the ocean, but have a hard time walking.
-- Ross MacDonald, The Blue Hammer
However, the real slaughter, the one that all the maritime nations of the world opposed and strove to abolish, was pelagic sealing, the kind that Schransky particularly enjoyed and from which he profited enormously.
-- James Michener, Alaska
Pelagic is derived from the Greek word pélag which meant "the sea."