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Deep-water Decapods
Deep-sea species inhabit the slope and the ocean floor, also in the thickness of water from the lower boundary of the epipelagic to the abyssal. Epipelagic (0 - 200 m) is a photic zone in which sunlight penetrates. Mesopelagic (200 - 1000 m) is a twilight zone, in which very little sunlight penetrates. Below there are bathypelagic (1000-4000 m) and abyssopelagic (4000 - 6000 m) aphotic zones, where the sunlight does not penetrate at all. Bathypelagic and abyssopelagic zones make up about 75% of the inhabited space of the World Ocean. On depending from the region in the bathypelagic zone of the ocean lies a layer with a minimum oxygen content at a depth of 700-1000 m. This zone is most rich in nutrients. About 90% of the World Ocean is in the darkness, the water temperature here does not exceed 3°C and is sometimes lowered to -1,8°C (except for hydrothermal ecosystems where the water temperature can be more than 350°C), little level of oxygen, and high pressure in dependence on depth is from 20 to 1000 atmospheres.
Some species of decapod crustaceans was catch at the great depths. The known species of deep-water Decapods possible divided into 2 groups: demersal and pelagic. Demersal (bottom) species usually have a limited range of depth of their occurrence, but the range of occurrence of depths of some pelagic species may be a very wide. For example, from the water surface to a depth about 5000 m.
Pelagic species
 
Demersal species
     
 
Non identification species which was caught at depths of more than 200 m.
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