Kosjön
southern acidified forest lake · 57°N
Real lakereal shorelinemeasured max depth 5 m7 species on recordsizes from survey fishingreal water chemistrysources & method →
clarity 1.3 mmax depth 5 mpH 5.4mesotrophicstatus poorgravel road
Character of the water
Kosjön lies in the south — a southern acidified forest lake. Acidification has thinned life down to the hardiest few.
The surroundings
The lake lies half-remote, a fair way from the nearest road, tucked into woodland.
Moderately deep (5 m) — shallow bays, the odd reef and a deeper channel through the middle.
Permits & rules
Fishing permit required — Kosjön FVOF. Day permit ~60 kr · annual permit ~300 kr.
- Pike: keep at most one over 75 cm per day.
- Handheld tackle only. Respect the protected zones at the inlets and outlets.
Species in Kosjön
perch predatory fish
typically ~13 cm · can reach 32 cm
Here perch lives on the small stuff — and rewards those who fish small and fine.
ål fish
typically ~55 cm · can reach 110 cm
Ål lives down in the cool — the deep is its home ground all year.
bream coarse fish
typically ~28 cm · can reach 30 cm
Bream holds the bottom even in clear water — shade and depth are its cover.
pike predatory fish
typically ~44 cm · can reach 46 cm
Pike is a sight-hunter here — the clear water means long follows before the take.
burbot bottom fish
typically ~45 cm · can reach 90 cm
Burbot lives down in the cool — the deep is its home ground all year.
roach coarse fish
typically ~14 cm · can reach 18 cm
Here roach lives on the small stuff — and rewards those who fish small and fine.
sutare fish
typically ~35 cm · can reach 60 cm
Sutare holds the bottom even in clear water — shade and depth are its cover.
Fishing Kosjön
perch, pike and burbot sit at the top of the food chain in Kosjön, carried by ål, bream and roach. The clearer water makes the fish wary — and rewards a careful presentation.
The fishing here follows the water's own rhythm: dawn and dusk have their windows, fronts close and open them, and the season moves the fish. No two sessions at Kosjön are alike.
General rules of thumb for this kind of water
- Acidified water yields few, hardy species.
The catch board
- 1Axel Raskpike40 cm
- 2Torbjörn Petterssonburbot38 cm
- 3Nils Viklundsutare28 cm
- 4Karl Bergperch15 cm
- 5Mats Lindqvistperch11 cm
- 6Bjørn Boströmperch11 cm
Species records here
pike40 cmAxel Rask
burbot38 cmTorbjörn Pettersson
sutare28 cmNils Viklund
perch11 cmMats Lindqvist
The same water, for real
