| Country | Sweden | Ecosystem | Baltic Sea |
| Locality | Persö, Askö Archipelago, Baltic Proper | Depth | 8 m |
| Introduced | Year Intro. | ||
| Life Stage | not specified | unsexed | |
| Quantitative | 49170 | Unit | numbers/m^2 |
| Semi Quantitative | 1000-50000 | Unit | numbers/m^2 |
| Qualitative | extremely abundant | ||
| Year | 2003 - 2003 | Period | 2001-present |
| Date | 2003-09-01 00:00:00 - 2003-09-30 00:00:00 | Record Type | field sample |
| Record Type | field sample | ||
| Seasonal | not specified | Method | swept area |
| Remarks | Average abundance found associated in 12 Mytilus patches of varying sizes. Sampling conducted in Spetember 2003, dates assumed. | ||