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The four-eyed fish eye. 1.Underwater retina 2.Lens 3. Air pupil 4. Tissue band 5. Iris 6. Underwater pupil 7. Air retina 8. Optic nerve. The maximum length of four-eyed fishes is up to 32 cm TL in A. microlepis, making this species the largest in the order Cyprinodontiformes.
Anablepidae is a family of ray-finned fishes which live in brackish and freshwater habitats from southern Mexico to southern South America. [2] There are three genera with sixteen species: the four-eyed fishes (genus Anableps), the onesided livebearers (genus Jenynsia) and the white-eye, Oxyzygonectes dovii.
Anableps anableps, the largescale four-eyes, [3] is a species of four-eyed fish found in fresh and brackish waters of northern South America and Trinidad. This species grows to a length of 30 centimetres (12 in) total length (TL). This fish can occasionally be found in the aquarium trade. The fish does not actually have four eyes.
A black vertical bar on the head runs through the true eye, making it hard to see. [2] This pattern may result in a predator confusing the back end of the fish for the front end. The foureye butterflyfish's first instinct when threatened is to flee, putting the false eye spot closer to the predator than the head.
The finescaled four-eyed fish (Anableps microlepis) is a species of four-eyed fish found in coastal waters of the Atlantic Ocean from Trinidad and Tobago down to southeastern Brazil. [3] [4] [5] They mostly inhabit brackish environments such as estuaries, mangrove swamps, and tidal mudflats. It grows to approximately 30 cm (12 in) in length. [3 ...
Rhynchohyalus natalensis, the glasshead barreleye, is a species of barreleye found in oceans around the world at depths from 247 to 549 metres (810 to 1,801 ft). This species grows to a length of 16 centimetres (6.3 in) SL.
It is known in the aquarium trade as the Indian or false four-eyed fish, as the eyes are parted horizontally to enable the fish to see above and below the water surface at the same time, as with the South American four-eyed fish of the genus Anableps. [4]
The eyes of Winteria telescopa differ slightly from those of other opisthoproctids by their more forward-pointing gaze.. Barreleyes, also known as spook fish (a name also applied to several species of chimaera), are small deep-sea argentiniform fish comprising the family Opisthoproctidae found in tropical-to-temperate waters of the Atlantic, Pacific, and Indian Oceans.