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Sofia, 1 May 2011. In order to protect endangered sturgeon species, Bulgaria decided to ban sturgeon fishing in May 2011. Romania was the first country to implement a sturgeon fishing ban in the Danube in 2006 and is now followed by its southern neighbour.

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 Danube River is seeing an influx of new non-native species, stemming from the increasing interconnections with various European and global water bodies via canals and other waterways designed to facilitate navigation. It is currently believed that alien species are very likely to become even more significant in the future, as the importance of the Danube as an international waterway increases.

The territory of Bulgaria is 110,912 km². The country is characterized by a rich diversity in morphological, geological, geomorphological, hydro-climatic and soil-biogenic aspects.