Abstract
The distribution of pikeperch, Sander lucioperca (Linnaeus, 1758), in Bosnia and Herzegovina reflects the combined influence of hydrographic structures and anthropogenic activities. While naturally present in the Sava River and its tributaries within the Black Sea basin, the species has expanded into the Adriatic basin since the late 20th century, primarily due to human-mediated introductions and hydrotechnical interventions. This expansion has enabled pikeperch to colonize new ecological niches, particularly within hydroaccumulations and karstic lakes, where it has successfully established viable populations. The study analyzes the ecological consequences of this distribution, highlighting the negative impacts on native and endemic ichthyofauna of the Adriatic basin, including Salmo marmoratus, Salmo obtusirostris, and other salmonids and cyprinids. Hydrographic connectivity, facilitated by dam construction and water regulation, has played a crucial role in enabling the spread of pikeperch beyond its natural range. Anthropogenic factors, such as stocking and recreational fishing practices, further accelerated its expansion, which often occurs at the expense of genetic diversity and ecosystem stability. The findings highlight the importance of integrating hydrographic characteristics and anthropogenic pressures into freshwater ecosystem management. Pikeperch in Bosnia and Herzegovina serves as a bioindicator of ecological change, demonstrating how human interventions can reshape species distributions and threaten endemic biodiversity. Effective conservation strategies must, therefore, combine hydrological planning, genetic monitoring, and strict regulation of introductions to mitigate further ecological risks.
Keywords: Sander lucioperca, hydrography, distribution, invasive species, Bosnia and Herzegovina