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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).

Organic pollution has been on the rise in the Danube over the last century, as human activities have resulted in increasing loads of wastewater rich in organic matter. The most serious organic pollution problems occur in tributaries that regularly receive untreated or inadequately treated wastewater from industrial plants and municipalities. Thanks to the significant improvement of wastewater infrastructure and services in the Danube countries, the basin-wide organic emissions reduced by 60% since the mid 2000s.