Ohrid trout (scientifically Salmo letnica) - endemic freshwater fish that lives in Ohrid Lake, and belongs to the family of trout. One of the endemic species, a freshwater fish in Europe and is the closest ancestor of the species that lived in this area since the Tertiary. It differs from the stream trout by the flattened body, the small head and the stary grey spots on the body. The colour of the meat in some of them is white, and in some pink. The maximum length ranges from 25 to 60 cm, and the maximum weight is up to 15.8 kg. The crossbreeds created by crossing the stream and Ohrid trout along the body have alternately red circular and gray stellar spots like the letnica. Ohrid trout is tasty to eat. As one of the trademarks of Macedonia, it is also found on Macedonian coins. There are more than 200 species of endemic organisms in Ohrid Lake, some of which are unchanged from the time of the tertiary. These are the four types of sponges, the most famous of which is the endemic round sponge, the rare snail species, and the relict algae species. And, one of the most specific plants is the underwater plant "Hara". In addition, the city and the lake are protected as a natural and cultural treasure by UNESCO.