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Test fishing: documented sizes
SLU Aqua has test-fished the water with standardised gillnets (1978–2015). The table shows the largest individuals and the mean length recorded per species.
| Species | Largest recorded | Mean | Year | Number measured |
|---|---|---|---|---|
| Pike | 86 cm | 52.7 cm | 1987 | 9 |
| Zander | 72.5 cm | 27.3 cm | 2015 | 56 |
| Perch | 46.5 cm | 13.2 cm | 1984 | 1,954 |
| Whitefish | 38.5 cm | 25.6 cm | 1987 | 239 |
| Bream | 35.7 cm | 18.8 cm | 1987 | 38 |
| Roach | 30 cm | 18.6 cm | 1987 | 737 |
| Silver bream | 27.5 cm | 20.9 cm | 1980 | 51 |
| Burbot | 25.8 cm | 17.1 cm | 1980 | 3 |
| Vendace | 20.8 cm | 15 cm | 1980 | 1,393 |
| Rudd | 19.4 cm | 19.4 cm | 2015 | 1 |
| Ruffe | 17.4 cm | 9.7 cm | 1987 | 651 |
Source: SLU Aqua · NORS (gillnet test fishing in lakes). Go to provfiske.se for everything on test fishing in Rottnen.