Salmo peristericus, or the Prespa trout is a variety of trout, a freshwater fish in the Salmonidae family. It is endemic to the Lake Prespa watershed at the border area of Greece and the Republic of Macedonia.Four populations are known: one in the Agios Germanos stream in north-western Greece, and the others in the Brajcinska and Kranska rivers and the Leva Reka stream of Macedonia.The Prespa trout is morphologically difficult to separate from other trouts of the region.