aphotic zone


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aphotic zone:

see oceanocean,
interconnected mass of saltwater covering 70.78% of the surface of the earth, often called the world ocean. It is subdivided into four (or five) major units that are separated from each other in most cases by the continental masses. See also oceanography.
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aphotic zone

[a′fäd·ik ‚zōn]
(oceanography)
The deeper part of the ocean where sunlight is absent.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Three sampling points were considered: the confluence of two feeder rivers (PC), near the net cages (PNC), and in the dam zone (PD); while samples were taken in the euphotic ([Z.sub.eup]) and aphotic zones ([Z.sub.aph]).
twilight, down to about 1000 meters; the aphotic zone, perpetual
lucifuga (SVL = 62 mm) was collected by hand from the aphotic zone of Flat Rock Cave (Tennessee Cave Survey Number SM66) in Smith County, Tennessee (36[degrees] 14.06'N, 86[degrees] 05.57'W).