Superkingdom Eukaryota
Kingdom Animalia
Phylum Chordata
Subphylum Vertebrata
Superclass Pisces
Class Osteichthyes
Subclass Actinopterygii (ray-finned fishes)
Superorder Protacanthopterygii or Division Teleostei
Order Salmoniformes
Family Salmonidae
Genus Salmo

Once the genus containing all trout and salmon, many former species of Salmo have been moved into genera Oncorhyncus and Salvelinus.  With one notable exception, members of genus Salmo spawn in lakes and streams feeding the North Atlantic Ocean, the Mediterranean Sea, and branches thereof, although some are restricted to certain landlocked European and Asian lakes.

Small, italic text designates a species' range.
(SE) = Southern Europe  (WE) = Western Europe

S. Penshiniensis spawns in Kamchatka and lives in the Sea of Okhotsk. and the Pacific Ocean. Some scientists group S. Penshiniensis and O. Mykiss into a different genus, Parasalmo.

Primary source:

Froese, R. and D. Pauly. Editors. 2001. FishBase.
World Wide Web electronic publication: