| Main Ref. | National Register of Lake Surveys, 2006 (Ref. 57534) |
|---|---|
| Name used | Gymnocephalus cernuus |
| Locality | Lake HAGETJÄRN |
| Station | FRI-656803-127246-19870808 |
| Year | 1987 |
| Water depth | 25 m |
| Altitude | 150 m |
| Coordinates | In decimal: 59.17, 11.83 |
| Collector | Freshwater Research Institute |
| Identifier | Freshwater Research Institute |