In their morphological characters they gradually approach the pelagic forms upwards and the abyssal downwards.
The fishes of this family are all pelagic, and most of them are highly valued for food.
The storms of winter and pelagic enemies must, of course, take toll in proportion to the number of animals.
The negotiations were wrecked upon the question of pelagic sealing.
It is now understood that they are Euthyneurous Gastropods adapted to natatory locomotion and pelagic life.
The tadpoles of S. baudini, cyanosticta, phaeota, and puma are pelagic inhabitants of shallow ponds.
The pelagic fishes shade into the shore fishes on the one hand and into the deep-sea fishes on the other.
The Cete are all predaceous, fish, pelagic crustaceans, and especially squids and cuttlefishes forming their principal food.
It seems very likely that the primitive features were retained because of the pelagic habitat of a large part of the group.
Mayr (1945a:46) records it in the pelagic areas north of the New Guinea region.
"pertaining to the sea," 1650s, from Latin pelagicus, from Greek pelagikos, from pelagos "sea, high sea, open sea, main," from PIE *pelag- "to spread out" (cf. Greek plagos "side," Latin plaga "hunting net, curtain, region"), possibly from root *plak- (1) "to spread out, be flat" (see placenta).
Relating to or living in or on oceanic waters. The pelagic zone of the ocean begins at the low tide mark and includes the entire oceanic water column. The pelagic ecosystem is largely dependent on the phytoplankton inhabiting the upper, sunlit regions, where most ocean organisms live. Biodiversity decreases sharply in the unlit zones where water pressure is high, temperatures are cold, and food sources scarce. Pelagic waters are divided, in descending order, into the epipelagic, mesopelagic, bathypelagic, abyssopelagic, and hadopelagic zones.