|Abundance||occasional (usually not seen)||Ref.||Billard, R., 1997|
Occurs in the Rhine up to the Oural (Ref. 30578). Has extended its area (Ref. 40476). In "Annexe II de la Directive Habitats-Faune-Flore" and in "Annexe III de la Convention de Berne" (Ref. 40476). Introduced in the 1990s. Recently captured in the French water of Rhin. Established in many rivers in east of the country (Mathieu Bernard, pers. Com, 31 July 2008). Also Ref. 2163.