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During the day, trawls at depths between 350 and 600 m (1,100 and 2,000 ft) produce the highest catches and at night the greatest abundance of fish is in the depth range 170 and 400 m (600 and 1,300 ft); this indicates that some, but not necessarily all, fish make short daily vertical migrations. [1]
The alfonsino has large eyes and a deep, compressed body, 1.9–2.5 times its standard length at the greatest depth. [5] It is a rose red color dorsally and orange ventrally. The rest of its body is silvery-pink, and the breast is yellow-white in color. [4] Fins and the inside of the mouth are bright red.
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.
The latter allow them to use counter-illumination to escape predators that lurk in the depths: by matching the light intensity with the light penetrating the water from above, the fish does not appear darker if seen from below. They typically occur at a few hundred meters below the surface, but their entire depth range spans from 50 to 1,500 ...
However, at nighttime larger viperfish can be found in shallower depths. [6] The eyes of Chauliodus sloani maintain a constant size and proportion throughout growth of the fish. [9] In the retina, several rows of rod cell "banks" grow upon each other, increasing in number with size of the fish. [9]
Most adult female ceratioid anglerfish have a luminescent organ called the esca at the tip of a modified dorsal ray (the illicium or fishing rod; derived from Latin ēsca, "bait"). The organ has been hypothesized to serve the purpose of luring prey in dark, deep-sea environments, but also serves to call males' attention to the females to ...
Epinephelus marginatus (Latin pronunciation: [epiːˈnepʰelus marɡiˈnaːtus]), the dusky grouper, yellowbelly rock cod or yellowbelly grouper, is a species of marine ray-finned fish, a grouper from the subfamily Epinephelinae which is part of the family Serranidae, which also includes the anthias and sea basses.
The fertilized eggs are buoyant and planktonic; the larvae and juveniles drift with the currents—likely at much shallower depths than the adults—and upon metamorphosis into adult form, they descend to deeper waters. Dolichopteryx species are noted for their paedomorphic features, the result of neoteny (the retention of larval characteristics).