| Reference no. | Winkler, H.M., K. Skora, R. Repecka, M. Ploks, A. Neelov, L. Urho, A. Gushin and H. Jespersen, 2000 |
| Ecosystem | Baltic Sea |
| Status | native |
| Abundance | common (usually seen) |
| Lifestage | adults |
| Regional database | |
| Remarks | Majority of individuals entering rivers to breed have spent 2 years in the sea and are 60-90 cm long (Ref. 89463). Baltic populations do not leave the area (Ref. 59043). HELCOM: endangered; considered a high priority species (Ref. 83294). Also Ref. 6114. |