| 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 | juv./adults |
| Regional database | |
| Remarks | Reported only from the Neva, Narova and Luga rivers. Land-locked forms known from Lakes Ladoga and Onega (Ref. 26334). HELCOM: endangered in southwestern Baltic; near threatened in northern Baltic; considered a high priority species (Ref. 83294). |