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Photoblepharon palpebratum (Syn. P. palpebratus), the eyelight fish or one-fin flashlightfish, is a species of saltwater anomalopid fish of the order Beryciformes.It is native to the western and central Pacific Ocean where it is found along seaward reefs close to the ocean floor, usually near rocks and corals it can use as cover.
Usually, light enters through the fish eye at the cornea and passes through the pupil in order to reach the lens. Most fish species have a fixed size of the pupil while a few species have a muscular iris that allows for the adjustment of the pupil diameter. Fish eyes have a more spherical lens than other terrestrial vertebrates.
The flashlight fish has a short, stout, darkly colored body. Its maximum recorded length is 11.0 cm (4.3 in) TL. [5] Its blunt snout and large eyes are characteristic of its family. The pectoral fins are preceded by a white splotch and it may possess a spot of light discoloration at the top of its preopercle, though
Close-up of fish melanophores. Fish coloration is produced through specialized cells called chromatophores. The dermal chromatophore is a basic color unit in amphibians, reptiles, and fish which has three cell layers: "the xanthophore (contains carotenoid and pteridine pigments), the iridophore (reflects color structurally), and the melanophore (contains melanin)". [5]
These light-reflecting nodules are recognized as white spots. [ 4 ] [ 5 ] If strict bio-security rules are violated, the parasite may be introduced into a fish rearing unit by transfer of fish or equipment from infected systems.
Zangroniz said studies only use a few species of fish and don't represent the more than 30,000 fish species that exist. She added pain is measured in mammals on the grimace scale, often seen in ...
When the light strikes this fish at a certain angle, it can create an iridescent, rainbow effect. During acute periods of illness or after death, the tissues turn a milky-white. The specific name, vitreolus, is derived from the Latin vitreus, which means 'glass'. [2]
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