mesopelagic

From meso- +‎ pelagic.

mesopelagic (not comparable)

1. (oceanography) Describing the pelagic zone of the ocean between the photic epipelagic and the aphotic bathypelagic zones, characterized by very minimal light.

   Synonym: twilight

   • 2001, James Willard Nybakken, Marine Biology: An Ecological Approach, page 153:

     For those animals living in the mesopelagic zone, where some light downwells from the surface, a visual predator looking up at them could see a silhouette.

mesopelagic (plural mesopelagics)

1. A fish