Freestone · Volcanic · Hokkaido, JP

Akan River

Akan Riv 1
Tomorrow · A proper day on the water
Sculpin Streamer
Forecast · Tomorrow
A proper day on the water
A proper day for it. Work the seams with an upstream nymph, switch to the dry when they show.
75% projected
Today's fly
Sculpin Streamer
Sculpin Streamer
Conditions on the water · Tomorrow
Estimate
Level
Dry recently
No gauge reading
Water temp5.2°C
ClarityClear
Weather5°C
WindN 4 km/h
Pressure1000 hPa
Rain · recent0.0 mm
Rain · ahead0.1 mm

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

Water temperature for White-spotted Char
Cool — slow
5°C est.ideal 7–14°C
0°14°28°
How to fish it · for White-spotted Char
When
June to October; spring and autumn the safest windows
Where
Below the lake the Akan gathers into a river and runs south through forested volcanic country, and the managed water just under the outflow —…
Why this works
Good — water clarity is working for you, but insect activity is the limiting factor today.
Hatch timeline · tomorrowPeak at 06:00

12:00(now) — Autumn Olive

Stage: On emergersApproach: Emerger or dryActivity: 23%
Also:Autumn Needle Fly21%

Peak activity at 06:00 — Kajika Sculpin (Japan) (Kajika Sculpin (Japan))

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 2 as a supporter.

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Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Stenopsyche CaddisHatch
2
3
3
2
Cicada (Semi)Hatch
2
2
Ephemera strigata (Mid-Reach Keiryu Mayfly)Hatch
2
3
3
3
2
Epeorus latifolium (Riffle Mayfly)Hatch
2
3
3
3
3
3
2

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

Ranked for today
Fly box · White-spotted Char
EH
Elk Hair / large caddis
12–14 · Sedge
Evening sedge — twitch or dead-drift it as the light goes.
OD
Olive (Baetis) dun
14–18 · Dry
Cast to rising fish and let it drift drag-free.
BT
Beetle terrestrial (summer)
10–12 · Terrestrial
Fish it tight to the bank on warm, breezy days.
Permits & access
Permit required — see local rules.
  • Managed C&R/charge zone near the lake outflow — confirm payment, permitted reach and hook rules.
What's coming
Plan ahead
5-day outlook
Gallery · 2
  1. Akan Riv 1
    River draining Lake Akan.
  2. Terrain map of the venue
    Terrain map
Conservation note

Rainbow trout and white-spotted char (amemasu). Lead with the managed catch-and-release upper reach.

The full read · show the working · for White-spotted Char · confidence 75%
How the 65 is built — score × weight = contribution
Temperature72 × 28%20.2
Flow45 × 22%9.9
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure75 × 7%5.3
Insect activity30 × 12%3.6
Conditions total= 65
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
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