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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.

Kolotar, 4 October 2010. The acute toxic risk deriving from the heavy metals in the red sludge is rather low, as their concentrations are rather low. However, the chronic toxicity threat is high.

The Accident Emergency Warning System (AEWS) of the Danube River Basin is activated whenever there is a risk of transboundary water pollution, or threshold danger levels of certain hazardous substances are exceeded.

The habitats created by the Danube and its tributaries host a unique mix of species. But many habitats are degraded by man-made changes to the river profile and width, water depth and flow velocity following the construction of dams, weirs and canals. Many migratory fish including sturgeon species and the Danube Salmon are endangered or close to extinction by being disconnected from their spawning grounds and habitats or by being over-exploited.

A river does not end at its bank. The Danube and its tributaries form many diverse riverine habitats, including intricate networks of water bodies, creeks and channels, floodplain forests, water meadows, lakes, gravel islands, sandy banks and the unique delta habitats by the shores of the Black Sea.

The Danube and its tributaries host a variety of fascinating and diverse ecological territories with many unique plants and animals. The rich and unique biodiversity and riverine habitats have been under severe pressure due to human activities for centuries. However, today the protection of environment and biodiversity is on the political agenda of the different Danubian States.