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Test fishing: documented sizes
SLU Aqua has test-fished the water with standardised gillnets (1976–2006). The table shows the largest individuals and the mean length recorded per species.
| Species | Largest recorded | Mean | Year | Number measured |
|---|---|---|---|---|
| Perch | 24.1 cm | 11.8 cm | 2006 | 10 |
| Roach | 15.6 cm | 7.9 cm | 2006 | 231 |
| Pike | 13.6 cm | 13.6 cm | 2006 | 1 |
| Bleak | 12.9 cm | 10.2 cm | 2006 | 46 |
| Ruffe | 9.2 cm | 6.9 cm | 2006 | 53 |
Source: SLU Aqua · NORS (gillnet test fishing in lakes). Go to provfiske.se for everything on test fishing in Ölen.