World Distribution of Brown Trout,Salmo trutta

Abstract

During the past century the Eurasian and North African range of the brown trout, Salmo trutta L., has been extended to include discontinuous populations on all continents except Antarctica. Primary factors affecting the establishment of naturalized populations are water temperature, precipitation, and suitable spawning grounds. Any future major expansion in the world distribution of the brown trout, with the possible exception of Asia, is unlikely.