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The abyssal zone or abyssopelagic zone is a layer of the pelagic zone of the ocean. The word abyss comes from the Greek word ἄβυσσος ( ábussos ), meaning "bottomless". [ 1 ] At depths of 4,000–6,000 m (13,000–20,000 ft), [ 2 ] this zone remains in perpetual darkness.
In zoology, deep-sea gigantism or abyssal gigantism is the tendency for species of deep-sea dwelling animals to be larger than their shallower-water relatives across a large taxonomic range. Proposed explanations for this type of gigantism include necessary adaptation to colder temperature, food scarcity, reduced predation pressure and ...
An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 meters (9,800 ft) and 6,000 meters (20,000 ft).Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains are among the flattest, smoothest and least explored regions on Earth. [1]
Melanocetus murrayi was first described by the German zoologist Albert Günther in 1887 from material dredged up from the deep on the Challenger expedition of 1872 to 1876, the first scientific attempt to research the ocean depths; it was named in honour of Sir John Murray, a British biologist who took part in the expedition and was one of the founders of the new study of oceanography.
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]
The North Australian Basin (NAB; formerly Argo Abyssal Plain, or Argo Plain) is an oceanic basin in the easternmost corner of the Indian Ocean between northwest Australia and Indonesia. It was discovered by the U.S. research vessel " Argo " of the Scripps Institution of Oceanography in 1960. [ 1 ]
These species have been thought to have evolved in northern, colder seas, each diverging off of each other at different points in time, millions of years ago. [11] The notched-fin eelpout, which is commonly found in the Sea of Okhotsk, have shown researchers what the average length of an adult eelpout is, usually sitting between 21 and 26 cm ...
Abyssal Zone: Beneath the thermocline is the deep ocean or abyssal zone, where temperatures remain relatively uniform, hovering just above freezing (0°-3°C). This cold, dense water originates from polar regions, where surface water cools, sinks, and spreads towards the equator along the ocean floor, forming the deep ocean circulation system.