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Belene, 18 November 2014. WWF has released some 5,000 sterlets into the Danube River today as part of a 50,000-strong sturgeon restocking programme. This is the first restocking of endangered sturgeons performed by a non-government organization in Bulgaria, after years of scientific research, climatic and biological challenges.

Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000 establishing a framework for Community action in the field of water policy

Danube River Basin Analysis Report from 2004, according to EU Water Framework Directive Art. 5, including all relevant annexes.