What is a sea trout?

The sea trout is the anadromous (sea-going) form of the European brown trout (Salmo trutta. L.). It is native to western Europe from northern Portugal to the White Sea and Cheshkaya Gulf, Iceland and the Baltic Sea and has been established relatively successfully in eastern North America, but more so in the Southern Hemisphere, in Patagonia and the Falkland Islands, New Zealand and Australia/Tasmania.