The Danube Fish Database: documenting species distributions across a major European river basin (opens in new tab)

The Danube River Basin (DRB) harbors the highest documented fish species richness of any European river, yet native populations face increasing threats from physical infrastructures that impede longitudinal and lateral connectivity, unsustainable fisheries, the introduction of non-native species, and climate change. Spanning across 19 countries, the DRB presents conservation challenges that demand coordinated, transboundary data sharing. The present database compiles and standardizes fish occ...