0-200 m; Lots of biomass, light, and warm; Circadian rhythms play large rule; Colorful fish for communication (Day) or camouflage (night)

200-1000 m; Rapid decline in light, biomass, and temperature; Migrating vertically up to eat during the evening and hide below in the day and to save metabolic rate; Photophores for hunting, communication, and countershading

1000-2000 m; No light but a stable and low temperature; No biomass unless at the bottom of the sea with debris; Adaptations to conserve energy

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Vertebrate Zoology

Water Life Zones

Question	Answer
Epipelagic	0-200 m; Lots of biomass, light, and warm; Circadian rhythms play large rule; Colorful fish for communication (Day) or camouflage (night)
Mesopelagic	200-1000 m; Rapid decline in light, biomass, and temperature; Migrating vertically up to eat during the evening and hide below in the day and to save metabolic rate; Photophores for hunting, communication, and countershading
Bathypelagic	1000-2000 m; No light but a stable and low temperature; No biomass unless at the bottom of the sea with debris; Adaptations to conserve energy