Stillwater · Mixed · Hokkaido, JP

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.

Fair · Sakhalin Taimen
Large baitfish streamer · 8–10
A respectable few hours, if you choose your moments
Useful ripple, fishable wave. Worth a session if the wind holds.
49% confidence
limited data

Lake Shumarinai is often best in spring through autumn.

What moved it
  • WindW 23 km/hModerate breeze · Gusts to 44 km/h
Today's fly
LB
Large baitfish streamer8–10
Strip it for fish chasing fry or in coloured water.
Conditions on the water
Estimate
Wind
Moderate breeze · Gusts to 44 km/h
W 23 km/h
N
W
from the west
Wave40 cm chop
Water temp6.9°C
Air temp7°C
CloudBroken
Pressure1020 hPa
Rain · recent0.0 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Head to
Wind driftW wind
Western end

A westerly has held for 7 hours, running colder than the water (6°C air against 7°C water). The end it blows into is taking that chilled surface water, so try the sheltered western end instead — off the back of the wind, where the undertow returns food along the bottom. That chill sits in the top of the water, though, and the bed is slower to feel it — on a bottom bait it is the undertow, not the temperature, that puts you at this end. Treat it as a tiebreaker between good swims rather than an override — features and angling pressure usually count for more.

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

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

Keep an eye on changing conditions — wind shifts and cloud breaks can trigger short feeding spells.

Boat — at anchor

Windy conditions suit anchoring in productive areas rather than open-water drifting.

Sub-surface · on the nymphunder the surface

Hatch predictions

Supporters see the full sub-surface read.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 2 as a supporter.

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14-day free trial. Cancel anytime.

Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Claret DunHatch
2
3
2
Heather FlyHatch
2
2
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
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.
Chironomid pupa
Chironomid pupa
10–14 · Buzzer
Static or slow on a long leader — the staple stillwater chironomid.
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
63%
Cloud70%
Wind30%
Temp100%

A reasonable day here, though wind 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
  • Wind conditions (windy) are not ideal for this water.
  • Temperature (cool) is in the sweet spot for autumn fishing.
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