ABSTRACT
Bythotrephes is native to Eurasia, where it is widespread, including lakes in Russia, Italy, Germany, Sweden, The Netherlands, Britain, Belgium, Switzerland, Norway and Finland (Grigorovich et al, 1998; MacIsaac et al, 2000; Colautti et al, 2005). Information on the extent of Bythotrephes distribution in its native range is incomplete, but there are indications that it is spread longitudinally across all of Russia and into China (Grigorovich et al, 1998). Additionally, there have been some intracontinental invasions of Bythotrephes into reservoirs in western Europe (Ketelaars and Gille, 1994).
