Thirty-one species of fish live in the Krka River, which is 20.7% of the total number of fish recorded in Croatia.
The upper course of the Krka is an area of cold and fast water, where trout predominate. In the lower reaches, the river has a slower flow and lake-like parts, where carp predominate. The ichthyomass is dominated by Illyrian chub (Squalius illyricus) and Dalmatian ruud (Scardinius dergle).
Nine species are endemic to the Adriatic basin, and three are endemic to the Krka River, of which a critically endangered species (CR) is the Visovac goby (Knipowitschia mrakovcici), while endangered species (EN) are the Visovac trout (Salmo visovacensis) and the softmouth trout (Salmothymus obtusirostris).
There are four Natura target species: the sensitive species (VU) of the Dalmatian dogfish (Phoxinellus dalmaticus) and the endangered species (EN) of the Dalmatian barbelgudgeon (Aulopyge huegelii), the Italian barbel (Barbus plebejus), and the Canestrini’s goby (Pomatoschistus canestrinii).
In recent years, there have been changes to the fish stock with the appearance of invasive species introduced from the Danube basin. The Krka National Park is working intensively on their capture in cooperation with the local population.
