pe·lag·ic 
(pə-lăjĭk)
(pə-lăjĭk)adj.
Of, relating to, or living in open oceans or seas rather than waters adjacent to land or inland waters: pelagic birds.
[Latin pelagicus, from Greek pelagikos, from pelagos, sea; see plāk-1 in the Appendix of Indo-European roots.]