| Country | Locality | Introduced | Year | Qualitative Value | Ref. |
|---|---|---|---|---|---|
| Greenland | off Greenland | 1982 - 1996 | abundant | 80685 | |
| Russian Federation | Barents Sea | 1998 - 2006 | common | 80862 | |
| United States (contiguous states) | Penobscot Bay, Maine | 1997 - 1997 | common | 39299 | |
| United States (contiguous states) | Penobscot Bay, Maine | 1998 - 1998 | absent | 39299 |