: the species is currently present in 5 of them (endemic, native, introduced);
: possible in 0 of them (stray, questionable);
: absent from 3 of them (extirpated, not established, misidentification, error).
: all reports listed together.
: Western Atlantic: Hamilton River, Labrador, Newfoundland, Canada to northeastern Florida, USA. Occurs occasionally in Bermuda and French Guiana (Ref. 7251
). Northern Gulf of Mexico (Ref. 26938
). In Europe: Baltic Sea. Landlocked populations in Lakes Ladoga and Onega (Russia), both now extirpated. Occasionally recorded from Great Britain and North Sea in Elbe drainage (Ref. 59043
). Recent research revealed that this species existed in the Baltic Sea, but is now extirpated (Ref. 83384
). Near threatened globally, but extirpated in Europe (Ref. 59043
). International trade restricted (CITES
II, since 28.6.79).
The map in this page was supported by BioFresh that has received funding from the
European Union's Seventh Programme for research, technological development and demonstration under grant agreement No 226874