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The bathypelagic zone or bathyal zone (from Greek βαθύς (bathýs), deep) is the part of the open ocean that extends from a depth of 1,000 to 4,000 m (3,300 to 13,000 ft) below the ocean surface. It lies between the mesopelagic above and the abyssopelagic below.
Altogether, the pelagic zone occupies 1,330 million km 3 (320 million mi 3) with a mean depth of 3.68 km (2.29 mi) and maximum depth of 11 km (6.8 mi). [2] [3] [4] Pelagic life decreases as depth increases. The pelagic zone contrasts with the benthic and demersal zones at the bottom of the sea. The benthic zone is the ecological region at the ...
Below the mesopelagic zone it is pitch dark. This is the midnight (or bathypelagic zone), extending from 1,000 metres (3,281 ft) to the bottom deep-water benthic zone. If the water is exceptionally deep, the pelagic zone below 4,000 metres (13,123 ft) is sometimes called the lower midnight (or abyssopelagic zone). Temperatures in this zone ...
The pelagic part of the photic zone is known as the epipelagic. [91] The actual optics of light reflecting and penetrating at the ocean surface are complex. [12]: 34–39 Below the photic zone is the mesopelagic or twilight zone where there is a very small amount of light. The basic concept is that with that little light photosynthesis is ...
Below the mesopelagic zone it is pitch dark. This is the midnight or bathypelagic zone, extending from 1000 m to the bottom deep water benthic zone. If the water is exceptionally deep, the pelagic zone below 4,000 metres (2.5 miles) sometimes is called the lower midnight or abyssopelagic zone.
Galiteuthis glacialis paralarvae hatch in the bathypelagic layer and rise passively to the upper layers of the water. Then, they get dispersed in the epipelagic and mostly mesopelagic zones. The onset of maturation begins in the bathypelagic zone, and as the paralarvae mature, they begin to shift vertically (diurnal vertical migration).
A scale diagram of the layers of the pelagic zone. Mature snipe eels generally occupy the Bathypelagic Zone. Snipe eels are found in every ocean and generally occupy depths of 300–600 m, though specimens have been caught nearer the surface at night, and storms occasionally result in individuals being stranded on the shore. [21]
Bathydevius is a bizarre nudibranch with a highly unusual appearance, ecology, and taxonomy. It is the first known nudibranch to inhabit the bathypelagic zone, and only one of very few pelagic, free-swimming genera within this generally benthic group.