Stillwater · Mixed · Hokkaido

Lake Shumarinai

Lake Shumarinai 01

Lake Shumarinai is one of Japan's myth-fish waters — a remote northern lake, registered and managed for the Sakhalin taimen, where the fishing is deliberately rationed and the fish returned.

Marginal · Sakhalin Taimen
Large baitfish streamer · 8–10
A patient day, if you fancy it
Good wave on — drift country. Slow going — pick your moments and do not force it.
40% confidence
limited data
What moved it
  • WindSW 12 km/hGentle breeze
Today's fly
LB
Large baitfish streamer8–10
Strip it for fish chasing fry or in coloured water.
Conditions on the water
Live gauge
Wind
Gentle breeze
SW 12 km/h
N
SW
from the south-west
Wave20 cm ripple
Water temp—
Air temp19°C
CloudOvercast
Pressure—
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for Sakhalin Taimen
When
Spring and autumn
Where
Set up a broadside drift and cover the water systematically. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
The plan
Plan A

Set up a broadside drift and cover the water systematically. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.

Plan B

If the main plan is not working, switch to a smaller, more imitative pattern fished slower and deeper. A change of drift angle can also make a difference.

Watch for

Evening tends to be the best period in summer — stay late if you can for a sedge or spinner fall.

Boat — drift

A gentle ripple is ideal for drifting — broadside drift covering the wind lanes should be productive.

Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey

Hatch predictions

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Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Daddy Long LegsHatch
2
3
2
Lake OliveHatch
1
2
2
2
2
2
1
Silverhorns & LonghornsHatch
1
2
2
2
1

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Sakhalin Taimen fly box
LB
Large baitfish streamerTop
8–10 · Streamer
Strip it for fish chasing fry or in coloured water.
MS
Mouse / surface-wake fly
12–16 · Fly
A dependable searching pattern for these waters.
LS
Leech streamer
8–10 · Streamer
Strip it for fish chasing fry or in coloured water.
Permits & access
Permit required — see local rules.
  • Registration, lake-specific rules, minimum size and gear restrictions reported by official material — verify the current year
  • Conservation-first; no catch-rate language.
What's coming
Plan ahead
5-day outlook
Condition match
59%
Cloud50%
Wind65%
Temp60%

A reasonable day here, though cloud isn't quite in the sweet spot.

Gallery · 2
  1. Lake Shumarinai 01
    Remote northern lake.
  2. Terrain map of the venue
    Terrain map
About this water

Lake Shumarinai is one of Japan's myth-fish waters — a remote northern lake, registered and managed for the Sakhalin taimen, where the fishing is deliberately rationed and the fish returned. Bear country and big-sky country, fished from boats by those who have planned for it, and the taimen here are a reason people cross the world and accept they may not touch one.

Under the surface

A remote, cold northern lake in the Horokanai hills, managed under registration and strict rules for its Sakhalin taimen, amemasu and trout along the shorelines. Spring and autumn are the windows; the rest is weather, distance and bear-country patience.

Wading: Remote bear country lake, cold water, boat logistics

  • Lake
  • Mixed
  • Stillwater
  • Shoal
Why this score
  • summer conditions with overcast skies and breezy wind.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Taimen late spring → autumn

    Sakhalin taimen (Itou) — conservation-first, catch-and-release only. Species surfaced in prose; not scored. Legal status: guidance_not_permission.

Related guides
Thermal Layers & Troutreading depth and temperatureEuro Nymphingsubsurface methods
Booking & contacts