Huchen, popularly known as glavačica, glavatica, glavatić, huj, ljepotica, sulac, sulač, sulak, sulc, sulčik, sulica, suljač, štulac, šulica, šumaj; huchen is one of the largest trout species in the world. It can exceed 165 cm and weigh over 50 kg.
The head is particularly noticeable on its spindle body with the mouth so large that the jaw goes over the back edge of the eyes. The reason for this is because the huchen feeds on amphibians, reptiles, smaller mammals and small water birds. Huchen is extremely sensitive to degradation of habitats and it has become endangered because of river dams building. It lives only in the Danube region, but due to the attractiveness there were attempts to inhabit it to the streams of Western Europe, which turned out to be unsuccessful.