Linked from
The 32 pages that link to Mesopelagic zone, each with the reason it gives.
Deep scattering layerNarrower topic: Much of the layer occupies this dim zone during daylight.
LanternfishNarrower topic: Lanternfish spend much of the day in this twilight zone.
Mesopelagic fishNarrower topic: This is the habitat that defines the group.
BarreleyeNarrower topic: Many barreleyes inhabit this dim middle layer of the ocean.
StomiiformesNarrower topic: It is a major habitat for stomiiform fishes and their prey.