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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.
Linophryne arborifera, or the illuminated netdevil, [2] is a deep-sea anglerfish of the family Linophrynidae, found in all tropical and subtropical oceans at depths below 1,000 m (3,300 ft) in the Bathyal zone. Like many ceratioids, the female is significantly larger than parasitic male.
Linophryne indica, or headlight angler, is a leftvent anglerfish in the family Linophrynidae, found in the bathyal zone of the Pacific Ocean at depths below 1,000 m (3,300 ft). The female is significantly larger than the mature male.
The bathyal zone is the lower section of the midwater zone, and encompasses the depths of 1,000 to 4,000 metres (3,300 to 13,100 ft). [23] Light does not reach this zone, giving it its nickname "the midnight zone"; due to the lack of light, it is less densely populated than the epipelagic zone, despite being much larger. [ 24 ]
Lanternfish are well known for their diel vertical migrations: during daylight hours, most species remain within the gloomy bathypelagic zone, between 300 and 1,500 m (980 and 4,920 ft) deep, but towards sundown, the fish begin to rise into the epipelagic zone, between 10 and 100 m (33 and 328 ft) deep.
The chimaera is a marine species, typically found on slanted and flat areas of deep oceans at the continental slope, sometimes extending into the bathyal zone. It has a broad depth range, occurring in waters 400 metres (1,300 ft) – 1,800 metres (5,900 ft) in depth, typically in the deeper part of this range. [5]
Black scabbardfish at Funchal market, Madeira The black scabbardfish (Aphanopus carbo) is a bathypelagic cutlassfish of the family Trichiuridae found in the Atlantic Ocean between latitudes 69°N and 27°N at depths between 180 and 1,700 m (600 and 5,600 ft). [3]
The aphotic zone is further divided into the mesopelagic, bathyal, abyssal, and hadal zones. The mesopelagic zone extends from 200 metres (656 ft) to 2,000 metres (6,562 ft). The bathyal zone extends from 2,000 metres (6,562 ft) to 4,000 metres (13,123 ft).