| Main Ref. | National Register of Lake Surveys, 2006 (Ref. 57534) |
|---|---|
| Name used | Gymnocephalus cernuus |
| Locality | Lake BJÖRKETJÄRN |
| Station | FRI-661264-127329-19980727 |
| Year | 1998 |
| Water depth | 19 m |
| Altitude | 150 m |
| Coordinates | In decimal: 59.57, 11.79 |
| Collector | Värmland Province Fishery Unit |
| Identifier | Värmland Province Fishery Unit |