''Salmo ciscaucasicus'', the Caspian salmon or Terek trout, is a

salmonid Salmonidae (, ) is a family of ray-finned fish, the only extant member of the suborder Salmonoidei, consisting of 11 extant genera and over 200 species collectively known as "salmonids" or "salmonoids". The family includes salmon (both Atlantic a ...

fish endemic to the

Caspian Sea The Caspian Sea is the world's largest inland body of water, described as the List of lakes by area, world's largest lake and usually referred to as a full-fledged sea. An endorheic basin, it lies between Europe and Asia: east of the Caucasus, ...

and its inflowing rivers.''Salmo ciscaucasicus''
at www.fishbase.org. It was described in 1967 originally as a

subspecies In Taxonomy (biology), biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (Morphology (biology), morpholog ...

of ''

Salmo trutta The brown trout (''Salmo trutta'') is a species of salmonid ray-finned fish and the most widely distributed species of the genus ''Salmo'', endemic to most of Europe, West Asia and parts of North Africa, and has been widely introduced species, in ...

''.Dorofeeva, E. A., 1967 ''Comparative morphological principles of taxonomy of East European salmons.'' Voprosy Ikhtiologii v. 7: 3-17. ''S. ciscaucasicus'' lives on the western shore of the lake from northern

Azerbaijan Azerbaijan, officially the Republic of Azerbaijan, is a Boundaries between the continents, transcontinental and landlocked country at the boundary of West Asia and Eastern Europe. It is a part of the South Caucasus region and is bounded by ...

to the

Ural River The Ural, also known as the Yaik , is a river flowing through Russia and Kazakhstan in the continental border between Europe and Asia. It originates in the southern Ural Mountains and discharges into the Caspian Sea. At , it is the third-longes ...

, while the main breeding river is the Terek. It lives at depths down to 50 m. Males can reach a maximum

standard length Fish measurement is the measuring of individual fish and various parts of fish anatomy, their anatomies, for data used in many areas of ichthyology, including Taxonomy (biology), taxonomy and fishery biology. Overall length Standard length (SL) is ...

of 130 cm. Forms of the species include anadromous, lacustrine, and resident. In the northern Ural and Volga, there may be hybrids between ''S. ciscaucasicus'' and ''S. trutta''. Another species, '' Salmo caspius'' Kessler, 1877, inhabits the southern part of the Caspian, but it is considerably smaller in size.

References

ciscaucasicus Fish described in 1967 {{salmonidae-stub