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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]

River systems globally are experiencing social-ecological changes that often impact Indigenous fishing practices, including climate change and resource developments. We explore the relationship between access to fish and well-being, and the determinants of access to fish amidst changing social-ecological conditions through interviews with 29 individuals across four Gwich'in First Nation communities in Canada's Northwest Territories. Our interviews show that socioeconomic and environmental barriers are making it harder to access fish and that this has negative implications for well-being. Despite these barriers, access to fish continues to make positive, diverse contributions to well-being in Gwich'in communities through socioeconomic factors such as sharing networks and adaptive practices that are often part of ecological monitoring and land-based education and facilitate access to fish. Increasing our understanding of the relationship between access to fish and well-being, and determinants of access to fish, can contribute to land-based programs, land-use planning, and decision-making in Gwich'in territory and other river systems. [ABSTRACT FROM AUTHOR]