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Pearleye
provided by wikipedia EN

The pearleyes are a family, Scopelarchidae, of aulopiform fishes, distinguished by their unique visual system, with two retinas in each eye.[2]

They are small to medium fish, ranging in size from just 3.7 cm (1.5 in) in adult length to 35 cm (14 in) in length, depending on species. They have a similar appearance to lizardfishes, with a large mouth, numerous teeth, and a forked tail. The dorsal fin is located in the middle of the back, with a small adipose fin.[2]

Like many other deep-sea fish, their eyes are telescopic, allowing them to see in near darkness. However, unlike any other fishes, their eyes also possess a "pearl organ"; a white spot on the surface of the eye that may help to pick up light from the side of the fish, out of the normal visual field. The pearl organ is associated with a secondary retina, allowing the fish an unusually wide field of view.[2]

Pearleyes typically live between 500 and 1,000 m (1,600 and 3,300 ft), although some species may visit shallower waters during the night.[2]

References

  1. ^ Davis, M.P. (2015): Evolutionary Relationships of the Deep-Sea Pearleyes (Aulopiformes: Scopelarchidae) and a New Genus of Pearleye from Antarctic Waters. Copeia, 2015, 103 (1): 64-71.
  2. ^ a b c d Johnson, R.K. & Eschmeyer, W.N. (1998). Paxton, J.R. & Eschmeyer, W.N., eds. Encyclopedia of Fishes. San Diego: Academic Press. p. 126. ISBN 0-12-547665-5..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""'"'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
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Pearleye: Brief Summary
provided by wikipedia EN

The pearleyes are a family, Scopelarchidae, of aulopiform fishes, distinguished by their unique visual system, with two retinas in each eye.

They are small to medium fish, ranging in size from just 3.7 cm (1.5 in) in adult length to 35 cm (14 in) in length, depending on species. They have a similar appearance to lizardfishes, with a large mouth, numerous teeth, and a forked tail. The dorsal fin is located in the middle of the back, with a small adipose fin.

Like many other deep-sea fish, their eyes are telescopic, allowing them to see in near darkness. However, unlike any other fishes, their eyes also possess a "pearl organ"; a white spot on the surface of the eye that may help to pick up light from the side of the fish, out of the normal visual field. The pearl organ is associated with a secondary retina, allowing the fish an unusually wide field of view.

Pearleyes typically live between 500 and 1,000 m (1,600 and 3,300 ft), although some species may visit shallower waters during the night.

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Distribution
provided by World Register of Marine Species
Distribution: Antarctic, Atlantic, Indian, and Pacific. Scales cycloid. Whole body and postorbital region with scales. Lateral line scales 40-65. Tongue with strong and usually hooked teeth. Eyes large and tubular, oriented upward or slightly dorso-anteriorly. Dorsal fin with 5-10 rays. Anal fin with up to 39 rays; usually 17-27. Pectoral fins with 18-28 rays. Swim bladder lacking. Vertebrae 40-65. About 23 cm maximum length. Adults usually found in depths of 500-1000 m; larvae usually occuring in 100-200 m.
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MASDEA (1997).
i18n: Contributor
Edward Vanden Berghe [email]
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