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Relating to or inhabiting the layer of the water column of the open ocean that lies between the mesopelagic and abyssopelagic layers at depths of about 1,000 to 4,000 meters (3,280 to 13,120 feet).
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) of, relating to, or inhabiting the lower depths of the ocean between approximately 1000 and 4000 metres
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌbæθ ə pəˈlædʒ ɪk)

pertaining to or living in the bathyal region of an ocean.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Observations on the swimming activity of two bathypelagic mysid species maintained at high hydrostatic pressures.
The only exception is the bathypelagic genus Benthomisophria Sars, 1909, in which the internal anatomy, post-naupliar development, specialized feeding organs, and feeding were well studied using deep-sea plankton samples (<4,000 m deep) (Boxshall and Roe 1980; Boxshall 1982, 1984).
Blue sharks have been described as meso- and bathypelagic predators (Clarke et al., 1996).
Therefore, the frequency of occurrence and abundance of bathypelagic species (e.g., coronate medusae) may also be underestimated.
Although most acirrate species tend to be associated with benthic habitats, one deep-sea species, the circumglobal gelatinous giant octopod, Haliphron atlanticus Steenstrup, 1861, (formerly named Alloposus mollis and referred to as the seven-arm octopus) of the family Alloposidae is somewhat unique in using both continental slope benthic habitats and open-ocean mesopelagic and bathypelagic habitats around the world, except at the extreme polar latitudes [9, 24].
Comparative chemosensitivity to amino acids and their role in the feeding activity of bathypelagic and littoral crustaceans.
Tripodfish (Aulopiformes: Bathypterois) locomotion and landing behavior from video observation at bathypelagic depths in the Campos Basin of Brazil.
From there it's the Bathypelagic Zone, down to 4000 meters.
The fourline snakeblenny, Arctic grayling, Arctic char, lake trout, ninespine stickleback, and Pacific sand lance are benthopelagic (species that float or swim just over the floor of the sea); the Pacific herring, sardine cisco, Arctic cisco, and capelin are pelagic-neritic (inhabiting shallow coastal waters over the continental shelf); and the polar cod is bathypelagic (occurring in the mid-waters below the level of light penetration, which, depending on the authors, may lie between 900 m and 4000 m).