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Salmon parr (I) can normally be distinguished from young brown/ sea trout (II) by the more streamlined shape, deeply forked tail, longer pectoral fin, lack of orange on adipose fin, smaller mouth, sharper snout, only 1 – 4 spots on gill cover (often one large spot), well defined parr marks.
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 globally as a game fish, even becoming one of the world's worst invasive species outside of its native range.
Brown trout can reach the ripe old age of 20 years. Ferox trout are a genetically distinct piscivorous form of Salmo trutta. They live in deep, glacial lakes in Scotland often feeding on Arctic charr. Freshwater forms of brown trout that migrate from lakes into rivers or streams to spawn and known as ‘potamodromous’.
The maximum reported age for the brown trout is 38 years old. Brown trout have been caught in the wild as old as 20 years old, although they normally die at a much younger age. In anadromous populations, brown trout will rarely live past 10 years of age. For anadromous brown trout, latitude plays a key role in longevity.
The young trout will emerge from the gravel between mid-March and early May. Many of the spent adults, known as ‘kelts’, will die. But a significant number will survive and return to the sea to recover and grow.
A native of the “old” world, Brown Trout were stocked in the United States as far back as the 19th century, and are now the second most widely distributed wild trout species after rainbow trout. They generally have a brownish-yellow body but this can be highly variable.
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 globally as a game fish, even becoming one of the world's worst invasive species outside of its native range.
