Salmo trutta

The brown trout (Salmo trutta) is a European species of salmonid fish that has been widely introduced into suitable environments globally. It includes purely freshwater populations, referred to as the riverine ecotype, Salmo trutta morpha fario, a lacustrine ecotype, S. trutta morpha lacustris, also called the lake trout,Derwent Publications, Thesaurus of Agricultural Organisms, Vol. 1, London: Chapman and Hall, 1990, p. 1058.E. Brown, World Fish Farming: Cultivation and Economics, Connecticut: AVI, 1983, p. 93. and anadromous forms known as the sea trout, S. trutta morpha trutta. The latter migrates to the oceans for much of its life and returns to fresh water only to spawn. 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 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. S. trutta morpha fario forms stream-resident populations, typically in alpine streams, but sometimes in larger rivers. Anadromous and non-anadromous morphs coexisting in the same river appear genetically identical.Lack of genetic differentiation between anadromous and resident sympatric brown trout (Salmo trutta) in a Normandy population. . In Aquatic Living Resources, Volume 18, N° 1, January–March 2005. Pages 65–69. What determines whether or not they migrate remains unknown.

No narrative description available for this taxon yet.