Onsjön
northern nutrient-rich lowland lake · 64°N
clarity 1.1 mmax depth 7 mpH 7.4eutrophicstatus poorgravel road
Character of the water
Onsjön lies in the cold north — a northern nutrient-rich lowland lake.
The surroundings
The lake lies half-remote, a fair way from the nearest road, tucked into woodland.
Moderately deep (7 m) — shallow bays, the odd reef and a deeper channel through the middle.
Permits & rules
Fishing permit required — Onsjön FVOF. Day permit ~60 kr · annual permit ~300 kr.
- Pike: keep at most one over 75 cm per day.
- Trout & Arctic char: protected during the autumn spawn · catch-and-release on certain stretches.
- Handheld tackle only. Respect the protected zones at the inlets and outlets.
Species in Onsjön
perch predatory fish
typically ~22 cm · can reach 45 cm
The nutrient-rich water keeps perch moving constantly between the feeding grounds.
pike predatory fish
typically ~62 cm · can reach 120 cm
Pike hunts by feel more than sight in the stained water — short, hard strikes close to the bait.
grayling fish
typically ~30 cm · can reach 50 cm
The nutrient-rich water keeps grayling moving constantly between the feeding grounds.
burbot bottom fish
typically ~45 cm · can reach 90 cm
Down on the bottom burbot sifts the soft ground — patience beats speed here.
roach coarse fish
typically ~18 cm · can reach 32 cm
The nutrient-rich water keeps roach moving constantly between the feeding grounds.
trout salmonids
typically ~35 cm · can reach 70 cm
Trout hunts by feel more than sight in the stained water — short, hard strikes close to the bait.
Arctic char salmonids
typically ~35 cm · can reach 70 cm
Arctic char hunts by feel more than sight in the stained water — short, hard strikes close to the bait.
whitefish whitefish
typically ~30 cm · can reach 55 cm
Whitefish roams the open water after the feed — a moving target.
Fishing Onsjön
Onsjön holds 8 species, with perch, pike and grayling at the top of the chain and roach and whitefish schooling beneath them. The modest depth keeps most of the fishing within reach of the bank.
Every session at Onsjön is fished in whatever conditions hold right then — the same pressure, wind and light as over the real water. What bites today isn't what bit the day before, and those who return learn the water for real.
General rules of thumb for this kind of water
- Nutrient-rich lakes hold plenty of baitfish but often murky water.
The catch board
- 1Sara Johansenburbot47 cm
- 2Jukka Erikssonburbot37 cm
- 3Astrid Viklundburbot36 cm
- 4Oskar Hedlundperch18 cm
- 5Stefan Åströmroach16 cm
- 6Gustav Åströmroach16 cm
Species records here
burbot37 cmJukka Eriksson
perch18 cmOskar Hedlund
roach16 cmGustav Åström
The same water, for real
