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The mesopelagic zone (Greek μέσον, middle), also known as the middle pelagic or twilight zone, is the part of the pelagic zone that lies between the photic epipelagic and the aphotic bathypelagic zones. [1]
At night, like many other animals that live in the twilight zone, it migrates to more shallow waters in search of food. Each night it reaches the upper layer of the ocean, or sunlight zone where ...
H. heteropsis is generally found at ocean depths of 200–1000 meters (0.12–0.62 miles), which is considered part of the ocean's mesopelagic, or twilight, zone. [3] The species undergoes diurnal vertical migration, where they are found at lower depths during the day and migrate up the water column at night. [11]
However, the frequent encounters with this animal are from tourism expeditions in the Antarctic that are increasingly offering personal submersibles to guests to take photos. This leads to the sighting of the giant phantom jellyfish hundreds of feet underwater off the coast of Antarctica's Rongé Island .
The abyssal zone extends from 4,000 metres (13,123 ft) to 6,000 metres (19,685 ft) or 6,500 metres (21,325 ft), depending on the authority. The hadal zone refers to the greatest depths, deeper than the abyssal zone. Some twilight occurs in the mesopelagic zone, but creatures below the mesopelagic must be able to live in complete darkness. [5] [6]
Mystery of octopus garden in ocean’s midnight zone solved by scientists ... It looks like the warm waters that are emanating from these springs is a key to why these animals are breeding there ...
All species in the genus Cyclothone live in the midwater range of the deep sea, and are most commonly found in the mesopelagic zone at 300–1500 meters depth (roughly 1,000-5,000 feet). [7] The deep sea is an extreme habitat, and life in the deep ocean has specialized adaptations to survive.
Many animals can glow in the dark. In a new study, scientists report that deep-sea corals that lived 540 million years ago may have been the first animals to glow, far earlier than previously thought.