Soča online guide
10 gps spots for Soča river , section of Institute of fishing Slovenia
Buy a licence online or camp Klin, Lepena 1
Online licence:
https://www.ribiskekarte.si/en/zavod-za-ribistvo-slovenije/nakup/1084
Best techniq is dry fly. To catch a marble trouts look for slower water, away from the main current, ussualy by the banks ( on the side) , behind the rocks etc. Best dry fly immitations are mayflies at 12- 18#
Caddis, big stoneflies.
Download pdf file.