The demersal zone is the part of the sea or ocean (or deep lake) consisting of the part of the water column near to (and significantly affected by) the seabed and the benthos. The demersal zone is just above the benthic zone and forms a layer of the larger profundal zone.
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[de.mer.sal] adj [L demersus (pp. of demergere to sink, fr. de- + mergere to dip, sink) + E [1]-al--more at merge] (1889): living near, deposited on, or sinking to the bottom of the sea "~ fish eggs".
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From Latin demersus, past participle of demergere (“to sink”); compare demersed. demersal (comparative more demersal, superlative most demersal). (biology) That lives near the bottom of a body of water.
en.wiktionary.orgDemersal animals live on or near the bottom of the sea or lakes. The term is usually applied to fish. They occupy the sea floors and lake beds, which usually consist of mud, sand, gravel or rocks. In coastal waters they are found on or near the continental shelf...
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