Lowland · Peat · Hokkaido

Sarufutsu River

Sarufutsu River terrain map
Poor · Itou (Sakhalin Taimen)
Large baitfish streamer · 8–10
Poorlive now
Not the day for it
Low and clear — careful approach country. A morning for the obvious fish only.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp19.7°C
  • ClarityClear
Today's fly
LB
Large baitfish streamer8–10
Strip it for fish chasing fry or in coloured water.
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp19.7°C
ClarityClear
Weather19°C
WindE 19 km/h
Pressure1012 hPa
Rain · recent0.0 mm
Rain · ahead26.8 mm

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

Water temperature for Itou (Sakhalin Taimen)
Warm — slow
20°C est.ideal 6–14°C
0°14°28°
How to fish it · for Itou (Sakhalin Taimen)
When
Late spring and autumn, subject to conservation rules
Where
The Sarufutsu moves slowly through the peat wetlands of Japan's far north, dark and unhurried, and it is first a conservation icon and only second a fishery:…
Why this works
Water at 19.7°C. This is the line where catch-and-release kills sakhalin taimen. Do not fish for them today.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 3 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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Evidence
ModelledModerate confidence

Modelled from regional ecology — no survey or occurrence data for this water yet.

Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Cicada (Semi)Hatch
2
2
Stenopsyche CaddisHatch
2
3
3
2
Terrestrial BeetlesHatch
2
3
3
2
Blue Winged OliveHatch
1
2
2
2
2
1

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

Ranked for today
Itou (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.
  • Conservation-first water
  • Verify current local rules, land access and closures; barbless hooks, keep fish wet, guide strongly recommended
  • No catch-rate promises.
What's coming
Plan ahead
5-day outlook
Water here around 20°C. Nothing cooler within range — carry a thermometer.
Conservation note

Sakhalin taimen / Itou (Parahucho perryi) — a conservation-sensitive northern Hokkaido population, taxonomically distinct from European huchen (Hucho hucho) and Siberian taimen (Hucho taimen); do NOT route through the European hucho scoring path. Catch-and-release and habitat protection dominate. Amemasu also present. Prose only.

The full read · show the working · for Itou (Sakhalin Taimen) · confidence 90%
How the 10 is built — score × weight = contribution
Temperature8 × 30%2.4
Flow68 × 25%17.0
Clarity85 × 20%17.0
Feeding Time70 × 15%10.5
Pressure85 × 10%8.5
Limiting factor: Water temperature (19.7°C) is outside Itou (Sakhalin Taimen)'s preferred range (6–14°C)= 55
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 6–14 °C ideal band — would lift the score and ease welfare.
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
Euro Nymphingsubsurface methods
Booking & contacts