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We Pass was an initiative aiming to facilitate fish migration in the Danube River Basin, set up by the ICPDR, Jaroslav Černi Institute, DDNI, CDM SMITH, OAK Consultants, and the Norwegian Institute for Nature Research. The focus was on the preservation and reestablishment of endangered fish species migration routes in the Danube River, its tributaries, and specifically at the Iron Gates.

Sturgeons and other migratory fish species represent a historic, economic and natural heritage of the Danube River Basin and are indicators of the ecological status of aquatic ecosystems, especially of the functionality of ecological corridors. Their populations have suffered substantially from overfishing, pollution, habitat destruction and disruption of their migration routes. The need for their conservation is recognized at a high political and management level (EUSDR-PA 06, Biodiversity, DRBMP).

Sturgeons are sensitive to environmental pressures and therefore valuable indicators for healthy rivers. This is why the ICPDR has endorsed sturgeons as flagship species. There are six species of sturgeons native in the Danube River Basin, but the survival of these ancient fish is threatened by a range of issues. Through the "Danube Sturgeon Task Force", the ICPDR contributes to actions such as the protection of habitats, the development of migration aids, the breeding of healthy stocks in sheltered facilities, or the struggle against illegal fishing and caviar trade.

The Danube River Basin is Europe's second largest river basin, with a total area of 801,463 km². It is the world's most international river basin, flowing through the territory of 19 countries. The ecosystems of the Danube River Basin are highly valuable in environmental, economic, historical and social terms, but they are subject to increasing pressure and serious threats of pollution from agriculture, industry and cities.