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1. Dwelling at or near the bottom of a body of water: a demersal fish.
2. Sinking to or deposited near the bottom of a body of water: demersal fish eggs.

[From Latin dēmersus, past participle of dēmergere, to sink : dē-, de- + mergere, to sink.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biology) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(dɪˈmɜr səl)
(of marine life) persisting at the lowest ocean layers; bottom-dwelling.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


- Describing a fish that lives close to the floor of the sea or a lake.
See also related terms for lake.
Farlex Trivia Dictionary. © 2012 Farlex, Inc. All rights reserved.
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Small-size fishes accounted for the majority of demersal fishes within hard (98% of all fish sampled), mixed (99%), and soft (79%) strata.
and Soviet EEZ's is being reduced, howeveer, other demersal species such as hoki, Macruronus novaezelandiae, and blue whiting, Micromesistius poutassou, as well as pelagic-species such as jack mackerel, Trachurus japonicus, and sardine, Sardinia melanostrichus, are also being used in surimi production (Table 3).
Nearly all industrial vessels based on Santa Catarina State are associated to one of these syndicates and they represent a significant part of the industrial double-rig fleet operating in southeastern-south region (i.e., 80.7%, 51.3%, and 74.0% of the total number of vessels licensed, respectively, to catch demersal fishes, pink and sea-bob shrimps).
It could start with pelagic species (anchovies, mackerel, bluefin tuna), for example, followed by demersal mixed fisheries, expanding the list of species covered from year to year, she explained.
We conclude that this technique provides a feasible method for inferring large-scale population structure for demersal fishes in high latitudes.
Pauly then discusses fisheries research and the demersal fisheries of Southeast Asia, K.
Overall, pelagic species such as mackerel (11.01 ton [km.sup.-2]), jack mackerel (15.4 ton [km.sup.-2]), sardine (26.9 ton [km.sup.-2]), anchovy (39.1 ton [km.sup.-2]), and mesopelagic fish (67.3 ton [km.sup.-2]) dominated the system (Table 2), representing 26% of [B.sub.T], while the combined biomass of demersal fish represented 0.1% of Bt.
The fishing effort of all demersal fishing activity in this area has been frozen pending the preparation of further scientific advice.
Abstract--Videotapes collected by the research submersible Jago in the Benguela ecosystem during spring 1997 were analyzed to determine demersal nekton assemblage composition, fish behavior, and microscale habitat association, and habitat selection.