Kosjärv
northern clear oligotrophic forest lake · 66°N
clarity 8.1 mmax depth 3 mpH 6.7oligotrophicstatus goodforest track · 22 min for the last stretch
Character of the water
Kosjärv lies in the cold north — a northern clear oligotrophic forest lake. The water is crystal-clear and the fish skittish in the sharp light.
The surroundings
The lake lies half-remote, a fair way from the nearest road, tucked into woodland.
Shallow throughout (max 3 m), with reeds and vegetation over large areas — water that warms fast in spring.
Permits & rules
Fishing permit required — Kosjärv FVOF. Day permit ~100 kr · annual permit ~500 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 Kosjärv
perch predatory fish
typically ~22 cm · can reach 45 cm
Perch moves carefully in the clear water — small mouthfuls, many of them.
pike predatory fish
typically ~62 cm · can reach 120 cm
In the clear water pike picks its moments — wary, but relentless once committed.
roach coarse fish
typically ~18 cm · can reach 32 cm
Roach moves carefully in the clear water — small mouthfuls, many of them.
Fishing Kosjärv
perch and pike sit at the top of the food chain in Kosjärv, carried by roach. The clearer water makes the fish wary — and rewards a careful presentation.
Whoever fishes Kosjärv regularly builds something of their own: a log of what took, where and when. That's how the water gives up its patterns — cast by cast, never all at once.
General rules of thumb for this kind of water
- Clear water makes fish light-shy — dawn, dusk and night are usually best.
The catch board
- 1Lars Holmpike54 cm
- 2Gustav Karlssonpike50 cm
- 3Oskar Norénpike50 cm
- 4Jonas Krügerperch19 cm
- 5Lars Johansenroach15 cm
- 6Sabine Krügerroach14 cm
Species records here
pike50 cmGustav Karlsson
perch19 cmJonas Krüger
roach14 cmSabine Krüger
The same water, for real
