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The native range of brown trout extends from northern Norway and White Sea tributaries in Russia in the Arctic Ocean to the Atlas Mountains in North Africa. What determines whether or not they migrate remains unknown. Anadromous and non-anadromous morphs coexisting in the same river appear genetically identical. trutta morpha fario forms stream-resident populations, typically in alpine streams, but sometimes in larger rivers. The lacustrine morph of brown trout is most usually potamodromous, migrating from lakes into rivers or streams to spawn, although evidence indicates some stocks spawn on wind-swept shorelines of lakes. Sea trout in Ireland and Britain have many regional names: sewin in Wales, finnock in Scotland, peal in the West Country, mort in North West England, and white trout in Ireland. The latter migrates to the oceans for much of its life and returns to fresh water only to spawn. trutta morpha lacustris, also called the lake trout, and anadromous forms known as the sea trout, S.

It includes purely freshwater populations, referred to as the riverine ecotype, Salmo trutta morpha fario, a lacustrine ecotype, S.

The brown trout ( Salmo trutta) is a European species of salmonid fish that has been widely introduced into suitable environments globally. parcepunctata (Heckel & Kner, 1858) Salmo fario major (Walecki, 1863) Salmo venernensis (Günther, 1866) Salmo brachypoma (Günther, 1866) Salmo mistops (Günther, 1866) Salmo polyosteus (Günther, 1866) Salmo gallivensis (Günther, 1866) Salmo rappii (Günther, 1866) Salmo orcadensis (Günther, 1866) Salmo islayensis (Thomson, 1873) Salmo oxianus (Kessler, 1874) Salmo trutta oxianus (Kessler, 1874) Trutta variabilis (Lunel, 1874) Trutta marina (Moreau, 1881) Salmo lacustris rhenana (Fatio, 1890) Salmo lacustris septentrionalis (Fatio, 1890) Salmo lacustris romanovi (Kawraisky, 1896) Salmo trutta aralensis (Berg, 1908) Salmo trutta ezenami (non Berg, 1948) Salmo trutta ciscaucasicus (non Dorofeeva, 1967)

semipunctata (Heckel & Kner, 1858) Salar ausonii var. forestensis (Bloch & Schneider, 1801) Salmo cumberland (Lacepède, 1803) Salmo gadoides (Lacepède, 1803) Salmo phinoc (Shaw, 1804) Salmo cambricus (Donovan, 1806) Salmo taurinus (Walker, 1812) Salmo montana (Walker, 1812) Salmo spurius (Pallas, 1814) Salmo lemanus (Cuvier, 1829) Salmo truttula (Nilsson, 1832) Salmo caecifer (Parnell, 1838) Salmo levenensis (Yarrell, 1839) Salmo orientalis (McClelland, 1842) Salar ausonii (Valenciennes, 1848) Fario argenteus (Valenciennes, 1848) Salar bailloni (Valenciennes, 1848) Salar gaimardi (Valenciennes, 1848) Salar spectabilis (Valenciennes, 1848) Salmo estuarius (Knox, 1855) Salar ausonii var. forestensis (Bloch & Schneider, 1801) Salmo faris var.