living or found near or in the deepest part of a body of water.
sinking to or deposited on the bottom of a body of water. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
demersal (dɪˈmɜːsəl)
living or occurring on the bottom of a sea or a lake: demersal fish
[C19: from Latin dēmersus submerged (from dēmergere to plunge into, from mergere to dip) + -al1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Demersal trawls are used for sea-bed fish and prawns.
Gear types included are demersal longline, groundfish trawl, and groundfish pot.
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