The Asian bivalve Corbicula fluminea was first reported from Poland in 2003, from the Odra (Oder) River. It was found in the lower and later in the middle course of the river. In May 2011 this invasive species was found for the first time in the Vistula River, in Cracow, which indicates an extension of its distribution range in Europe. The Vistula is the largest river in the Baltic Sea catchment area. The invasion of C. fluminea may threaten native species and natural habitats in the Vistula and its tributaries.
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