Danube-Auen National Park on both land and water, and other invertebrates, the total number of species in Donau-Auen National Park is estimated to be at least 5,000. Danube-Auen National Park Donau-Auen National Park () covers 93 square kilometres in Vienna and Lower Austria and is one of the largest remaining floodplains of the Danube in Middle Europe. The German word Aue (variant Au) means "river island, wetland, floodplain, riparian woodland", i.e. a cultivated landscape in a riparian zone. The words Aue and Au occur in a large number of German place names—including Donau, the German word for the Danube River—and refer to forests,
International Association for Danube Research in the discussion and development of the “Guiding principles on sustainable hydropower development in the Danube Basin” and made major contributions concerning the ecological connectivity of the aquatic ecosystems and the classification of sensitive ecological areas. IAD members are active in the Danube Sturgeon Task Force and also are involved in a number of EU and its "EU Strategy for the Danube Region (EUSDR)" project initiatives. The DSTF aims to coordinate and foster the conservation of native sturgeon species in the Danube River Basin and the adjacent Black Sea by the implementation of the Sturgeon Action Plan adopted under the