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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.

daNUbs was a mulitnational EU research project carried out under the leadership of the Technical University of Vienna. The results from this project include estimates of nutrient inputs into the river network (MONERIS), as well as an assessment of the loads of nitrogen, phosphorus and silica transported via the river network. These results indicate that the nutrient status in the Black Sea has significantly improved since the 1980s.

The nutrient levels, notably phosphorus and nitrogen, found in the Danube River and its major tributaries hold significant international importance. This is because they directly contribute to the phenomenon of eutrophication in both the river itself and the Black Sea. Historical trend analysis of nutrient river loads over the past decades shows a significant reduction in the transported nutrient fluxes to the Black Sea. Overall nutrient emissions declined by 30% (nitrogen) and 50% (phosphorus) in the last 15 years. However, the current long-term fluxes are still considerably higher than those of the early 1960ies which represent river loads under low pressures, indicating a further load reduction potential that might be exploited for the benefit of the Black Sea. Nevertheless, in the last 5-10 years the measured loads are rather low and close to the Black Sea targets indicating significant water quality improvement.