[3] Salmo obtusirostris is found naturally in four drainages of the Adriatic Sea, in Croatia, Bosnia and Herzegovina and Montenegro: the Neretva-Vrljika system, the Jadro, the Morača-Zeta system, and possibly the Krka river drainage around Knin although it is presumed extinct for some time now.

There are no vertical stripes that are common in brown trout of the Adriatic Sea drainages that can be found.

[citation needed] Adriatic trout are threatened by excessive damming, hybridization with introduced species and overfishing.

[1] In the river Neretva, natural hybrids (named kosor by locals) between Adriatic and brown trout can be found.

Adriatic and brown trout have different spawning times that overlap only slightly every few years, which is why natural hybridization is not widespread and both species live sympatrically in the same rivers.