| Country | Locality | Introduced | Year | Qualitative Value | Ref. |
|---|---|---|---|---|---|
| Germany | Kadet Channel and Darss Sill | 2002 - 2012 | very common | 96045 | |
| Sweden | Persö, Askö Archipelago, Baltic Proper | 2003 - 2003 | very common | 95728 | |
| Germany | Pomeranian Bight with Adlerground | 2002 - 2012 | very common | 96045 | |
| Finland | Tvärminne Soological Station | 1982 - 1982 | common | 95960 |