Lenok

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Lenok
Temporal range: Miocene–Recent
Brachymystax lenok.jpg
Brachymystax lenok
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Salmoniformes
Family: Salmonidae
Subfamily: Salmoninae
Genus: Brachymystax
Günther, 1866 [1]
Species [2]

Lenoks, otherwise known as Asiatic trout or Manchurian trout, [3] are salmonid fish of the genus Brachymystax, native to rivers and lakes in Mongolia, Kazakhstan, wider Siberia (including Russian Far East), Northern China and Korea. [3] [4] [5]

Contents

Species

There are four species in this genus, of which three are listed by FishBase: [2]

A fourth species, Brachymystax tsinlingensis S. C. Li, 1966, was revalidated in 2015. [6]

Traditionally, only B. lenok was recognized, including both sharp-snouted and blunt-snouted forms. Based on differences in morphology and genetics, the blunt-snouted form was split off as a separate species, B. tumensis. [4] [7] [8] [9] Hybrids between these two are known. [9] The third species, B. savinovi, is sometimes considered a synonym of B. lenok. [4] The name B. savinovi has occasionally been used for the blunt-snouted lenok, [10] but this is incorrect. [4] [9]

Appearance

Lenoks can be sharp-snouted (B. lenok) or blunt-snouted (B. tumensis). [4] [9] Traditionally both these were included in B. lenok, but today they are generally recognized as separate. They are relatively round in shape, and speckled with dark brown spots. [3] Their ventrals are usually colored a reddish hue, and their pectoral fins yellowish. [11] They weigh up to 15 kilograms (33 lb), [12] and can reach a total length of 1.05 m (3.4 ft). [13]

Habitat, range and status

Lenoks tend to live in rivers of any sort, but usually upstream, where the water is colder. [14] They are also found in lakes such as Baikal. [4]

As currently defined, the sharp-snouted lenok (B. lenok) is widespread in central and eastern Russia, and also found widely in northern Mongolia, locally in northeastern Kazakhstan (Irtysh Basin) and northeastern China (Amur Basin). [4] [7] [10] The blunt-snouted lenok (B. tumensis) is found widely in southeastern Russia and more locally in northeastern and central parts of the country, as well as northeastern Mongolia (Amur Basin), northern China and Korea. [4] [10] Although the two generally are found in separate areas, there are also regions where their ranges overlap such as the Amur Basin. [4] [5] [7] [9]

Brachymystax savinovi is found in Markakol Lake and adjacent rivers in eastern Kazakhstan. [15]

The recently revalidated Brachymystax tsinlingensis is distributed in streams in the Yellow and Yangtze River basins in the Qinling Mountains of China. [6]

Though overall widespread, lenoks in South Korea are now on the verge of extinction due to deforestation and they have also declined in China. [14] [16]

History

In the Korean peninsula, lenoks were landlocked inland during the glacial epoch. [14]

Related Research Articles

<span class="mw-page-title-main">Salmonidae</span> Family of ray-finned fishes

Salmonidae is a family of ray-finned fish that constitutes the only currently extant family in the order Salmoniformes, consisting of 11 extant genera and over 200 species collectively known as "salmonids". The family includes salmon, trout, char, graylings, freshwater whitefishes, taimens and lenoks, all coldwater mid-level predatory fish that inhabit the subarctic and cool temperate waters of the Northern Hemisphere. The Atlantic salmon, whose Latin name became that of its genus Salmo, is also the eponym of the family and order names.

<span class="mw-page-title-main">Amur</span> Major river in eastern Russia and northeastern China

The Amur, or Heilong Jiang, is the world's tenth longest river, forming the border between the Russian Far East and Manchuria/Northeastern China. The Amur proper is 2,824 kilometres (1,755 mi) long, and has a drainage basin of 1,855,000 km2 (716,000 sq mi). Including its source river Argun, it is 4,444 km (2,761 mi) long. The largest fish species in the Amur is the kaluga, attaining a length as great as 5.6 metres (18 ft). The river basin is home to a variety of large predatory fish such as northern snakehead, Amur pike, taimen, Amur catfish, predatory carp and yellowcheek, as well as the northernmost populations of the Amur softshell turtle and Indian lotus.

<i>Thymallus</i> Genus of fishes

Thymallus or graylings is a genus of freshwater salmonid ray-finned fish and the only genus within the subfamily Thymallinae. Although all Thymallus species can be generically called graylings, without specific qualification the term "grayling" typically refers to the type species Thymallus thymallus, the European grayling.

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<span class="mw-page-title-main">Ussuri</span> River in the Russian Far East and Northeast China

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<i>Hucho</i> Genus of fishes

Hucho is a genus of large piscivorous salmonid fish known as taimens, and is closely related to Pacific trout and lenoks. Native to the cold rivers and other freshwater habitats in Eurasia, they are threatened by overfishing and habitat loss.

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<i>Brachymystax lenok</i> Species of fish

Brachymystax lenok, the sharp-snouted lenok, is a salmonid fish distributed in rivers and lakes in northeastern Asia. It formerly included the blunt-snouted lenok, but recent authorities typically treat the latter as a separate species, B. tumensis, based on differences in morphology and genetics.

<span class="mw-page-title-main">Li Sizhong (ichthyologist)</span>

Li Sizhong was an ichthyologist with the Institute of Zoology (中国科学院动物研究所) at the Chinese Academy of Sciences. Throughout his research career, he made numerous discoveries of new fish species, and published many books and research papers describing the fauna and geographical distribution of fishes in China and beyond. He translated and helped publication of the Chinese editions of Fishes of the World and Fish Migration. Li was the major author of two published volumes in the Fauna Sinica monograph series, systematically reviewing and describing orders of bony fishes that include flat fish, cod, silverside, pearlfish, killifish, flying fish, etc. in or near China. He had written over 40 popular science articles about fish on Chinese newspapers and magazines, and been responsible for compiling and editing fish-related entries in several standard reference books. His works on freshwater ichthyofauna of China as well as other aspects of ichthyology are considered to be among some of the most notable in the Chinese ichthyology literature.

<i>Brachymystax tumensis</i> Species of fish

Brachymystax tumensis, the blunt-snouted lenok, is a salmonid fish distributed in rivers and lakes in Eastern Asia. It was formerly included in the more widespread species Brachymystax lenok, but more recent research based on differences in morphology and genetics have justified a distinction of the two species.

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Brachymystax savinovi is a salmonid fish species endemic to Markakol Lake and adjacent rivers in eastern Kazakhstan. It was formerly included in the more widespread species Brachymystax lenok.

References

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  5. 1 2 Alekseev, S. S.; Osinov, A. G. (2006). "Blunt-snouted lenoks (genus Brachymystax: Salmoniformes, Salmonidae) from the Ob' basin: New data on morphology and allozyme variation". Journal of Ichthyology. 46 (7): 500–516. doi:10.1134/S0032945206070022. S2CID   23102867.
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  7. 1 2 3 Bo, M. A.; and Jiang, Zuo-fa (2007). Genetic diversity and relationship between two species of Brachymystax in Wusuli River revealed by microsatellites. Journal of Fishery Sciences of China 14: 39-45.
  8. Balakirev, E.S.; Romanov, N.S.; and Ayala, F.J. (2014). Complete mitochondrial genome of blunt-snouted lenok Brachymystax tumensis (Salmoniformes, Salmonidae). Mitochondrial DNA 27: 1-2
  9. 1 2 3 4 5 Froufe, E.; Alekseyev, S.; Alexandrino, P.; and Weiss, S. (2008). The evolutionary history of sharp- and blunt-snouted lenok (Brachymystax lenok (Pallas, 1773)) and its implications for the paleo-hydrological history of Siberia. BMC Evolutionary Biology 8: 40. doi : 10.1186/1471-2148-8-40
  10. 1 2 3 Ratschan, C. (2013). Trout's Siberian Siblings . Chasing Silver 1: 86-96.
  11. Shaw, George; Stephens, James Francis (1800). General zoology, or Systematic natural history, Volume 5, Part 1.
  12. Ibex: "Salmon - Fishing in Siberia, Russia". Archived from the original on December 3, 2008. Retrieved 2010-07-04.
  13. "Brachymystax lenok". fishing-worldrecords.com.
  14. 1 2 3 Cherrytrout: "Fish". Archived from the original on February 4, 2015. Retrieved 2010-07-04.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
  15. Mamilov, N. (2020). "Brachymystax savinovi". IUCN Red List of Threatened Species. Retrieved 26 June 2022.
  16. Yingzhe, X.; Yan, S.; and Yiyu, C. (2006). DNA sequence variation in the mitochondrial control region of lenok (Brachymystax lenok) populations in China. Chinese Biodiversity 14(1): 48-54.