| Country | Poland | Ecosystem | |
| Locality | Hel, Gulf of Gdańsk | Depth | 10 m |
| Introduced | Year Intro. | 1999 | |
| Life Stage | not specified | unsexed | |
| Quantitative | 1000 | Unit | numbers/m^3 |
| Semi Quantitative | 1000-50000 | Unit | numbers/m^3 |
| Qualitative | very common | ||
| Year | 1999 - 1999 | Period | 1975-2000 |
| Date | 1999-08-01 00:00:00 - 1999-08-31 00:00:00 | Record Type | field sample |
| Record Type | field sample | ||
| Seasonal | Method | volumetric | |
| Remarks | Unusual occurrence in the bottom fauna on sandy and sandy-muddy sea bottoms at 0.5 to 10 m. Abundance recorded for August 1999 (dates assumed). | ||