''Brachymystax tumensis'', the blunt-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 Salmonidae is a family of ray-finned fish that constitutes the only currently extant family in the order Salmoniformes . It includes salmon (both Atlantic and Pacific species), trout (both ocean-going and landlocked), chars, freshwater whitefis ...

fish distributed in rivers and lakes in Eastern Asia. It was formerly included in the more widespread species ''

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.'' Jou ...

'' (now known as the sharp-snouted lenok), but more recent research based on differences in

morphology Morphology, from the Greek and meaning "study of shape", may refer to: Disciplines * Morphology (archaeology), study of the shapes or forms of artifacts * Morphology (astronomy), study of the shape of astronomical objects such as nebulae, galaxies ...

and

genetics Genetics is the study of genes, genetic variation, and heredity in organisms.Hartl D, Jones E (2005) It is an important branch in biology because heredity is vital to organisms' evolution. Gregor Mendel, a Moravian Augustinian friar wor ...

have justified a distinction of the two species.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.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. ''Brachymystax tumensis'' is found widely in southeastern Russia and more locally in northeastern and central parts of the country (including

Sakhalin Sakhalin ( rus, Сахали́н, r=Sakhalín, p=səxɐˈlʲin; ja, 樺太 ''Karafuto''; zh, c=, p=Kùyèdǎo, s=库页岛, t=庫頁島; Manchu: ᠰᠠᡥᠠᠯᡳᠶᠠᠨ, ''Sahaliyan''; Orok: Бугата на̄, ''Bugata nā''; Nivkh: ...

), as well as northeastern

Mongolia Mongolia; Mongolian script: , , ; lit. "Mongol Nation" or "State of Mongolia" () is a landlocked country in East Asia, bordered by Russia to the north and China to the south. It covers an area of , with a population of just 3.3 million, ...

(

Amur Basin The Amur (russian: река́ Аму́р, ), or Heilong Jiang (, "Black Dragon River", ), is the world's tenth longest river, forming the border between the Russian Far East and Northeastern China ( Inner Manchuria). The Amur proper is long, ...

), northern China and Korea (e.g.

Tumen River The Tumen River, also known as the Tuman River or Duman River (), is a long river that serves as part of the boundary between China, North Korea and Russia, rising on the slopes of Mount Paektu and flowing into the Sea of Japan. The river has ...

). In some regions, such as the Amur Basin, the range may overlap with that of ''B. lenok''. Earlier authorities have included the

South Korea South Korea, officially the Republic of Korea (ROK), is a country in East Asia, constituting the southern part of the Korea, Korean Peninsula and sharing a Korean Demilitarized Zone, land border with North Korea. Its western border is formed ...

n population in '' B. tsinlingensis'' instead of ''B. tumensis'' and this appears to be supported by

mtDNA Mitochondrial DNA (mtDNA or mDNA) is the DNA located in mitochondria, cellular organelles within eukaryotic cells that convert chemical energy from food into a form that cells can use, such as adenosine triphosphate (ATP). Mitochondrial DNA ...

(although its exact

taxonomic Taxonomy is the practice and science of categorization or classification. A taxonomy (or taxonomical classification) is a scheme of classification, especially a hierarchical classification, in which things are organized into groups or types. ...

position remains to be determined).

References

tumensis Fish of Asia Fish described in 1930 Taxa named by Tamezo Mori {{Salmoniformes-stub