| Main Ref. | National Register of Lake Surveys, 2006 (Ref. 57534) |
|---|---|
| Name used | Gymnocephalus cernuus |
| Locality | Lake ÖSTRA SILEN |
| Station | FRI-656742-129568-19940912 |
| Year | 1994 |
| Water depth | 49 m |
| Altitude | 103 m |
| Coordinates | In decimal: 59.18, 12.23 |
| Collector | KN1765 |
| Identifier | KN1765 |