Relating to the middle layer of the open ocean, extending from about 200 to 1000 meters depth. This twilight zone receives minimal sunlight and is characterized by bioluminescent organisms.
From Greek 'mesos' meaning 'middle' combined with 'pelagic' meaning 'of the sea.' The term was coined in the 1950s as part of the systematic classification of oceanic zones based on light penetration and biological communities.
The mesopelagic zone is nature's own alien world - home to more fish biomass than any other ocean layer, where creatures like lanternfish create living constellations with their bioluminescent displays! Every night, billions of these animals migrate upward in the largest migration on Earth.
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