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Stenodus leucichthys is a species of freshwater whitefish in the family Salmonidae. In the strict sense its natural distribution is restricted to the Caspian Sea basin, and it is known as beloribitsa (literally meaning "the fish that is white" in Russian).[2] The beloribitsa is now considered extinct in the wild, but survives in cultured stocks.[2][3] The nelma (Stenodus nelma), a more widespread species of Eurasian and North America, is sometimes considered its subspecies.[4][5]

Stenodus leucichthys
Conservation status
Extinct in the Wild  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Salmoniformes
Family:	Salmonidae
Genus:	Stenodus
Species:	S. leucichthys
Binomial name
Stenodus leucichthys (Güldenstädt, 1772)
Synonyms
Salmo leucichthys Güldenstädt, 1772 Stenodus leucichthys leucichthys (Güldenstädt, 1772) Salmo nelma (non Pallas, 1773)

Systematics

Alternatively, the name Stenodus leucichtys has been used in a broader sense, referring to a widespread species composed of two subspecies.[3] In addition to the landlocked subspecies Stenodus leucichthys leucichthys, it comprises the nelma, Stenodus leucichthys nelma (Pallas, 1773) which lives in Eurasian and North American rivers of the Arctic basin. Nelma, also known as the sheefish or inconnu, is currently often considered as a distinct species Stenodus nelma.[2][4][6][5][7]

At a higher level, the genus Stenodus is not phylogenetically distinct from the broader lake whitefish genus Coregonus, although it is phenotypically characterized by a specialized predator morphology.[8]

Description and status

The fish has a large mouth with a protruding lower jaw and a high and pointed dorsal fin. It is generally silver in color with a green, blue or brown back. The meat is white, flaky and somewhat oily. An adult fish weighs from 14 to 25 kilograms (31 to 55 lb). The fish eat plankton for their first year of life and then become predators of smaller fish.^{[citation needed]}

Beloribitsa used to inhabit particularly the Volga, Ural and Terek rivers, and migrate up to 3,000 kilometres (1,900 mi) upstream from the Caspian to their spawning grounds in the spring. Following the construction of dams and hydropower reservoirs, the migration and natural reproduction has been impeded, and the taxon is now considered as extinct in the wild by the IUCN.[2][9] The stock however survives in hatcheries and some populations are maintained by stocking.[4]

References

External links

• Stenodus leucichthys nelma Illustration of the sister species by N.N. Kondrakov. NOAA Photo Library.

На других языках

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- [en] Stenodus leucichthys

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[es] Stenodus leucichthys

El salmón blanco (Stenodus leucichthys)[2] es un pez marino y de río de la familia de los salmónidos.[3] Es la especie de este género que habitaba en el río Volga y otros ríos que desembocan en el mar Caspio, en Asia, pero hoy día se la considera extinta en estado salvaje, tan solo queda un grupo de reproductores mantenidos en cautividad para su futura reintroducción.[1]

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[ru] Белорыбица

Белорыбица, или не́льма[2][3] (лат. Stenodus leucichthys) — полупроходной вид рыб подсемейства сиговых семейства лососёвых (Salmonidae). Эндемик бассейна Каспийского моря.

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