| Country | Russian Federation | Ecosystem | |
| Locality | Neva Estuary, Berezovy Island | Depth | |
| Introduced | Year Intro. | ||
| Life Stage | not specified | unsexed | |
| Quantitative | 305 | Unit | numbers/m^3 |
| Semi Quantitative | 100-1000 | Unit | numbers/m^3 |
| Qualitative | very common | ||
| Year | 1996 - 1996 | Period | 1975-2000 |
| Date | 1996-08-17 00:00:00 - 1996-08-23 00:00:00 | Record Type | field sample |
| Record Type | field sample | ||
| Seasonal | Method | volumetric | |
| Remarks | C. pengoi population in the Baltic Sea is more abundant in sheltered locations than in open areas and its size depends to a large extent on weather conditions. | ||