| Pseudaspius leptocephalus | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Cypriniformes |
| Family: | Leuciscidae |
| Subfamily: | Pseudaspininae |
| Genus: | Pseudaspius |
| Species: | P. leptocephalus |
| Binomial name | |
| Pseudaspius leptocephalus (Pallas, 1776) | |
| Synonyms | |
| |
Pseudaspius leptocephalus, the redfin, is a species of cyprinid fish found in eastern Asia where it occurs in the countries of Russia, Mongolia and China.
Leptocephalus is the flat and transparent larva of the eel, marine eels, and other members of the superorder Elopomorpha. This is one of the most diverse groups of teleosts, containing 801 species in 4 orders, 24 families, and 156 genera. This group is thought to have arisen in the Cretaceous period over 140 million years ago.
Eels are any of several long, thin, bony fishes of the order Anguilliformes. They have a catadromous life cycle, that is: at different stages of development migrating between inland waterways and the deep ocean. Because fishermen never caught anything they recognized as young eels, the life cycle of the eel is a mystery which has covered a long period of scientific history into the present day. Of significant interest is the search for the spawning grounds for the various species of eels and identifying impacts to population decline in each stage of the life cycle.
Conger is a genus of marine congrid eels. It includes some of the largest types of eels, ranging up to 2 m (6 ft) or more in length, in the case of the European conger. Large congers have often been observed by divers during the day in parts of the Mediterranean Sea, and both European and American congers are sometimes caught by fishermen along the European and North American Atlantic coasts.
Nettastomatidae, the duckbill eels or witch eels are a family of eels. The name is from νῆττα and στόμα.
Neocyema erythrosoma is a species of pelagic fish, a deep-water bobtail snipe eel in the family Cyematidae. It is the only member of its genus, Neocyema. It was first described by Peter Castle in 1978 after two specimens were caught at great depths in the south Atlantic Ocean in 1971. Further specimens have since been caught in the North Atlantic.
The Atlantic tarpon is a ray-finned fish that inhabits coastal waters, estuaries, lagoons, and rivers. It is also known as the silver king. It is found in the Atlantic Ocean, typically in tropical and subtropical regions, though it has been reported as far north as Nova Scotia and the Atlantic coast of southern France, and as far south as Argentina. As with all elopiformes, it spawns at sea. Its diet includes small fish and crustaceans.
Leptocephalus is a genus that was used for species of larval eels, called leptocephali, that were thought to be new fish species, or whose adult eel species were not known. Leptocephali differ so much in appearance from their adults that the larvae and adults of eels are not easily matched, and when first discovered, leptocephali were thought to be a distinct type of fishes, but not eels. Because of this, the genus designation of Leptocephalus was used for a while for unidentified leptocephali even after it was known that these were the larvae of eels thus becoming a "wastebasket taxon", but this practice is no longer used. Examples of marine congrid larvae, found in the western Indian Ocean and the Red Sea that were named this way are listed below. Only two species in two families are currently treated as having any validity, though the validity of L. bellottii is strongly in doubt.
Pterothrissus gissu, also known as the Japanese gissu, is a species of ray-finned fish in the family Albulidae. The Japanese gissu is a rare fish that is distributed in deep water off northwest Pacific Ocean. This fish is known to pass through a leptocephalus larval stage, but only metamorphosed specimens have been available. This species is the only member of its genus.
The redlip shiner is a North American species of freshwater cyprinid fish. This shiner can be found in a few streams located in North Carolina, South Carolina, and Virginia. It inhabits rocky pools of clear headwaters, creeks and small rivers. Adults range in length from 40 to 55 mm.
Pseudaspius, commonly called redfin daces, are a genus of cyprinid freshwater fish found in eastern Asia, specifically the countries of Russia, Mongolia, China and Japan.
The bluehead chub is a cyprinid native to North America. Its name is due to its appearance, as breeding males have a blue head. Adult bluehead chubs are, on average, between 70 and 160 mm in length. They have a robust body with uniformly large scales. The scales are present on the belly and breast. They have a pored body, a weakly falcate pectoral fin, and pharyngeal teeth. They have a large mouth, small eyes, and a terminal barbel. Other characteristics include a darkened lateral band, spot on the caudal fin, and red coloration of the fins and iris of the eyes. They have 40 lateral line scales and 8 anal rays. The bluehead chub is a freshwater fish, and lives in pools, rivers, and streams. They feed on insects and plants.
Conger erebennus is an eel in the family Congridae. It was described by David Starr Jordan and John Otterbein Snyder in 1901, originally under the genus Leptocephalus. It is a marine, temperate water-dwelling eel which is known from Japan and the Korean Peninsula, in the northwestern Pacific Ocean. It is also called the "anaconda" アナコンダ in Tokyo, Japan.
Congriscus maldivensis is an eel in the family Congridae. It was described by John Roxborough Norman in 1939, originally under the genus Conger. It is a marine, deep water-dwelling eel which is known from the Indo-Western Pacific, including Australia, Fiji, Madagascar, Maldives, New Caledonia, the Philippines, Vanuatu, and Wallis and Futuna. It dwells at a depth range of 354–820 metres (1,161–2,690 ft). It can reach a maximum standard length of 35.2 centimetres (13.9 in).
Congriscus megastomus is an eel in the family Congridae. It was described by Albert Günther in 1877, originally under the genus Congromuraena. It is a marine, temperate-water dwelling eel which is known from Japan and the Kyushu–Palau Ridge, in the northwestern Pacific Ocean. It inhabits reefs. Males can reach a maximum total length of 40 centimeters. This species' remarkably large and distinct leptocephalus larvae were previously known under the name Thalassenchelys coheni. In 2016, scientists used genetic techniques to link the larvae to the adult C. megastomus. These larvae reach a maximum size of 30 cm (12 in) and have a number of unusual characteristics, including two forward-facing front teeth that may be used for feeding on different prey than other eel larvae.
Gnathophis capensis, the Southern Atlantic conger or southern conger, is an eel in the family Congridae. It was described by Johann Jakob Kaup in 1856, originally under the genus Leptocephalus. It is a subtropical, marine eel which is known from the southeastern Atlantic Ocean, including from False Bay to Plettenberg Bay, South Africa and also on Tristan da Cunha Island. It is known to dwell at a depth of 100 metres. Males can reach a maximum total length of 37 cm.
Rhynchoconger ectenurus, known commonly as the longnose conger in Australia, is an eel in the family Congridae. It was described by David Starr Jordan in Robert Earl Richardson in 1909, originally under the genus Leptocephalus. It is a marine, subtropical eel which is known from the western Pacific Ocean, including northern Australia, Japan, the Korean Peninsula, and the eastern China Sea. It inhabits soft sediments on the continental shelf and slope. Males can reach a maximum total length of 65 centimetres.
Highback chub is a species of freshwater fish in the carp family (Cyprinidae).
The Pacific redfin is a species of fish in the family Cyprinidae. It is found from the Siberian Pacific Coast through coastal Japan.
Pseudaspius nakamurai is a species of fish in the family Cyprinidae. It is endemic to Japan.
Pseudaspius sachalinensis is a species of fish in the family Cyprinidae. It is endemic to Japan and Sakhalin.
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