Freestone · Volcanic · Hokkaido

Shiribetsu River / Niseko

Shiribetsu River
Marginal · Rainbow Trout
Foam beetle / hopper · 10-14
Marginallive now
Slow going — pick your moments
Low and clear — careful approach country. Cover and shadow are doing the work today.
90% confidence
What moved it
  • LevelLight rain recentlyNo gauge reading
  • Water temp18.1°C
  • ClarityClear
Today's fly
Foam beetle / hopper
Foam beetle / hopper10-14
Proven pattern for this period
Conditions on the water
Estimate
Level
Light rain recently
No gauge reading
Water temp18.1°C
ClarityClear
Weather17°C
WindS 6 km/h
Pressure1008 hPa
Rain · recent9.3 mm
Rain · ahead0.0 mm

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

Water temperature for Rainbow Trout
Warm — slow
18°C est.ideal 10–18°C
0°14°28°
How to fish it · for Rainbow Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Water at 18.1°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6am

Hatch predictions

Today's headline hatch shown — see all 10 active hatches hour by hour with Pro.

Start free trial

14-day free trial. Cancel anytime.

Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read with Pro.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

Start free trial

14-day free trial. Cancel anytime.

Evidence
ModelledModerate confidence

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

Updated 14 hours ago

Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Stenopsyche CaddisHatch
2
3
3
2
Cicada (Semi)Hatch
2
2
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2

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

Ranked for today
Rainbow Trout fly box
Permits & access
Permit required — see local rules.
  • Hokkaido rules vary by reach; some waters open without a formal permit, but do not assume this everywhere
  • Confirm the exact water.
What's coming
Plan ahead
5-day outlook
Water here around 18°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Shiribetsu River
    River in Niseko resort area.
  2. Terrain map of the venue
    Terrain map
Conservation note

Rainbow and brown trout, white-spotted char, and Dolly Varden (oshorokoma, a Hokkaido headwater char).

The full read · show the working · for Rainbow Trout · confidence 90%
How the 39 is built — score × weight = contribution
Temperature97 × 28%27.2
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time55 × 13%7.2
Pressure75 × 7%5.3
Insect activity63 × 12%7.6
Conditions total= 80
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Char spring → late autumn

    Hokkaido is largely open-access for inland trout/char, with managed/charged zones the exception (e.g. the Akan C&R water). Verify the exact reach. Species surfaced in prose only. Legal status: guidance_not_permission.

Related guides
Euro Nymphingsubsurface methods
Booking & contacts