Abstract
This paper focuses on the historical and present occurrence of Danube huchen, Hucho hucho (L.), in Bosnia and Herzegovina. Danube huchen currently inhabits all large river systems in Bosnia and Herzegovina that it inhabited in the past, except for the Bosna River, from which it disappeared in the 1970s because of intense water pollution. Nevertheless, some populations of this species survive in Fojnieka rijeka, Lašva and Krivaja, which are small, mountainous tributaries of the Bosna River. Bosnia and Herzegovina has never participated in the IUCN Red Book of freshwater fishes, but, since the Danube huchen is endangered in its distribution area, protection, conservation, and enhancement measures must be undertaken throughout the area in which this noble fish occurs.