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.
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References in periodicals archive ?
7 % of the total biomass) and X2 dominated in the aphotic zone (84.
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.