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Test fishing: documented sizes
SLU Aqua has test-fished the water with standardised gillnets (1990–2024). The table shows the largest individuals and the mean length recorded per species.
| Species | Largest recorded | Mean | Year | Number measured |
|---|---|---|---|---|
| Tench | 45 cm | 33.7 cm | 2024 | 20 |
| Perch | 39.5 cm | 11.5 cm | 2018 | 459 |
| Crucian carp | 38 cm | 29.9 cm | 2012 | 51 |
| Pike | 37.3 cm | 23.8 cm | 1990 | 2 |
| Roach | 22.6 cm | 10.5 cm | 1990 | 914 |
| Ruffe | 16.1 cm | 11.8 cm | 1990 | 7 |
Source: SLU Aqua · NORS (gillnet test fishing in lakes). Go to provfiske.se for everything on test fishing in Laduviken.