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Ichthyological investigations were performed at 11 sampling sites in the Krupinica stream basin in the period of 2020 and 2021. In total, 22 fish species of 6 families (Balitoridae, Cobitidae, Cyprinidae, Gobiidae, Lotidae, Salmonidae) were recorded in the study area. The ichthyocenosis composition varied in the longitudinal profile from source to mouth. Upper sections of the watercourses were dominated by typical rhithral species, such as Eurasian minnow (Phoxinus phoxinus), stone loach (Barbatula barbatula) and brown trout (Salmo trutta m. fario). The fish community is to some extent influeneced by human activity (stocking of indigenous fish species, water reservoir). In the middle section rheophilic fish species were in dominant position and the share of rhithral species decreased. The lower section near the mouth to Ipeľ proved to be important for the occurrence of several protected species of European importance, such as Sabanejewia bulgarica and Kessler's gudgeon (Romanogobio kesslerii). This part of the river also plays a significant role as a nursery habitat of the 0+ rheophilic species such as common nase (Chondrostoma nasus), barbel (Barbus barbus), ide (Leuciscus idus) and asp (Leuciscus aspius). [ABSTRACT FROM AUTHOR]