: the species is currently present in 4 of them (endemic, native, introduced);
: possible in 0 of them (stray, questionable);
: absent from 0 of them (extirpated, not established, misidentification, error).
: all reports listed together.
: Asia: Endemic to the Amur River system. Two morphs, brown and gray, represent the species in the Amur River basin.
Occurrence in the Sea of Japan (Ref. 11102
) needs confirmation. International trade restricted (CITES
II, since 1.4.98; CMS
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