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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).

The Danube begins at the confluence of the Brigach and Breg Rivers in the city of Donaueschingen located in the Black Forest, Baden-Württemberg. The German Danube catchment area covers an area of about 56,200 km²; its share of the total Danube catchment area is approx. 7%. The German Danube basin is bordered by the Rhine basin to the west and the Elbe River basin to the east.