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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.

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.

The Danube River Protection Convention forms the overall legal instrument for co-operation on transboundary water management in the Danube River Basin. The Convention was signed on June 29 1994 in Sofia (Bulgaria) and came into force in 1998. It aims to ensure that surface waters and groundwater within the Danube River Basin are managed and used sustainably and equitably.

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.