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Brachymystax lenok
''Brachymystax lenok'', the sharp-snouted lenok,〔Kartavtseva, I.V.; Ginatulina, L.K.; Nemkova, G.A.; and Shedko, S.V. (2013). ''Chromosomal study of the lenoks, Brachymystax (Salmoniformes, Salmonidae) from the South of the Russian Far East.'' Journal of Species Research 2(1):91-98.〕 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.〔〔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.〕〔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〕〔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.〕
As presently defined, the sharp-snouted 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).〔〔〔Ratschan, C. (2013). ''(Trout's Siberian Siblings )''. Chasing Silver 1: 86-96.〕 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.〔〔 Although the two generally are found in separate areas, there are also regions where their ranges overlap such as the Amur Basin.〔〔〔
The sharp-snouted lenok is widespread overall, but some populations, especially in China, have declined due to overexploitation and pollution.〔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.〕 This species grows to a length of TL.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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