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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. | ||||
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| Pelagic species | ||||
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| Demersal species | ||||
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