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Coelacanths (/ ˈ s iː l ə k æ n θ / ⓘ SEE-lə-kanth) (order Coelacanthiformes) are an ancient group of lobe-finned fish (Sarcopterygii) in the class Actinistia. [2] [3] As sarcopterygians, they are more closely related to lungfish and tetrapods (which includes amphibians, reptiles, birds and mammals) than to ray-finned fish.
The mesopelagic zone is the disphotic zone, meaning light there is minimal but still measurable. The oxygen minimum layer exists somewhere between a depth of 700 metres (2,297 ft) and 1,000 metres (3,281 ft) deep depending on the place in the ocean. This area is also where nutrients are most abundant.
At depths of 4,000–6,000 m (13,000–20,000 ft), [2] this zone remains in perpetual darkness. [ 3 ] [ 4 ] It covers 83% of the total area of the ocean and 60% of Earth's surface. [ 5 ] The abyssal zone has temperatures around 2–3 °C (36–37 °F) through the large majority of its mass. [ 3 ]
The ocean depths still remain a largely unexplored part of the Earth, and form a relatively undiscovered domain. Scientific deep-sea exploration can be said to have begun when French scientist Pierre-Simon Laplace investigated the average depth of the Atlantic Ocean by observing tidal motions registered on Brazilian and African coasts circa the ...
Fisch, Rhineland-Palatinate, a municipality in Trier-Saarburg, Germany; Fisch (surname), a German surname; Fisch, botanical identifier for Friedrich Ernst Ludwig von Fischer; Fisch, a popular Roblox fishing simulator
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Lanternfish (or myctophids, from the Greek μυκτήρ myktḗr, "nose" and ophis, "serpent") are small mesopelagic fish of the large family Myctophidae.One of two families in the order Myctophiformes, the Myctophidae are represented by 246 species in 33 genera, and are found in oceans worldwide.
The voracious appetite, low degree of prey selectivity, broad depth distribution, slow rate of digestion and ease of sampling via longline bycatch make lancetfishes useful platforms by which to study the greater ecology of deep mid-water fauna. [12] [9] In 2023, several lancetfish have washed up on the coastline of beaches of Oregon.