Mountain Freestone · Granite · Honshū

Kurobe River (upper gorge)

Jujikyo in Kurobe Gorge
Poor · White-spotted Char
Tenkara kebari · 12–16
Poorlive now
Not the day for it
Low and clear — careful approach country. A morning for the obvious fish only.
80% confidence
What moved it
  • LevelLight rain recentlyNo gauge reading
  • Water temp18.3°C
  • ClarityClear
Today's fly
TK
Tenkara kebari12–16
A dependable searching pattern for these waters.
Conditions on the water
Estimate
Level
Light rain recently
No gauge reading
Water temp18.3°C
ClarityClear
Weather17°C
WindSW 5 km/h
Pressure1010 hPa
Rain · recent3.8 mm
Rain · ahead9.5 mm

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

Water temperature for White-spotted Char
Warm — slow
18°C est.ideal 7–14°C
0°14°28°
How to fish it · for White-spotted Char
When
Summer, when the high country is open and snow has cleared
Where
The Kurobe cuts one of the deepest gorges in Japan through the granite of the Northern Alps, a river of dam, tunnel and sheer rock where iwana live in cold…
Why this works
Water at 18.3°C — above the white-spotted char caution line (16°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Likely species
Mayflies
  • Blue-winged oliveMost likely
    #16–18 · Dun
    Duns are up; a sherry spinner fall may follow.
  • Large dark oliveAlso possible
    #14–16 · Emerger
    Dead-drift the emerger — it's sitting in the film.
  • Green drakeAlso possible
    #8–10 · Dun
    Duns are up — the Spent Gnat spinners fall at dusk.
  • Iron BlueAlso possible
    #16–18 · Dun
    Cold, grey day — the dun sits long. Good dry-fly water.
Caddisflies
  • Satin sedgeMost likely
    #12–14 · Egg-laying
    Skitter it at dusk — this one's fished, not dead-drifted.
  • GrannomAlso possible
    #14–16 · Pupa
    Pupa first, then dries as the adults come off.
Hatch timeline · todayPeak at 6am

Hatch predictions

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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

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Evidence
ModelledModerate confidence

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

Updated less than an hour ago

Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Alpine RhithrogenaHatch
2
3
3
2
Sculpin / Baitfish (Rivers)Hatch
2
3
3
3
3
3
3
3
2
Large Dark OliveHatch
1
2
2
1
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
White-spotted Char fly box
CM
Clinger mayfly dun (Epeorus / Rhithrogena)
14–18 · Dry
Cast to rising fish and let it drift drag-free.
Permits & access
Permit required — see local rules.
  • Area rules and serious access constraints; confirm permits and route
  • Mountain safety is essential.
What's coming
Plan ahead
5-day outlook
Water here around 18°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Jujikyo in Kurobe Gorge
    V-shaped gorge in Toyama.
  2. Terrain map of the venue
    Terrain map
Conservation note

White-spotted char (iwana).

The full read · show the working · for White-spotted Char · confidence 80%
How the 16 is built — score × weight = contribution
Temperature15 × 28%4.2
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure75 × 7%5.3
Insect activity58 × 12%7.0
Limiting factor: Water temperature (18.3°C) is outside White-spotted Char's preferred range (7–14°C)= 56
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 7–14 °C ideal band — would lift the score and ease welfare.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Char late February to April → late September to mid-October

    Honshu/Shikoku/Kyushu keiryu are managed by local fishery co-operatives — a yugyoken (day/annual ticket) is required, and most streams close around 30 September / mid-October for spawning. Species are surfaced in prose only (no engine slugs for yamame, amago or iwana). Legal status: guidance_not_permission.

Related guides
Euro Nymphingsubsurface methods
Booking & contacts