Freestone · Volcanic · Kyūshū, JP

Gokase River (Takachiho)

Manai Falls at Takachiho Gorge
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
Light rain recently
No gauge reading
Water temp9.4°C
ClarityClearing
Weather15°C
WindN 20 km/h
Pressure1019 hPa
Rain · recent3.7 mm
Rain · ahead0.0 mm

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

Water temperature for Yamame
Ideal
9°C est.ideal 9–16°C
0°14°28°
How to fish it · for Yamame
When
Du printemps jusqu'à la fermeture automnale ; les cours supérieurs sont plus frais en plein été
Where
The Gokase rises in the volcanic highlands of Miyazaki and runs through the mythic gorge of Takachiho — basalt-columned, waterfall-hung, woven into the oldest…
Why this works
Excellent — water temperature is right today, though river flow could be better.
Hatch timeline · tomorrowPeak at 6h

12h(now) — Autumn Olive

Stage: On emergersApproach: Emerger or dryActivity: 46%
Also:Autumn Needle Fly40%Black Gnat39%
Peak emergence windowWeather boost9 food groups active

Peak activity at 6h — Kajika Sculpin (Japan) (Kajika Sculpin (Japan), Weather boost)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 3 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 · Yamame
EH
Elk Hair / Stenopsyche caddis
12–14 · Sedge
Evening sedge — twitch or dead-drift it as the light goes.
CB
Cicada & beetle terrestrials (midsummer)
10–12 · Terrestrial
Fish it tight to the bank on warm, breezy days.
Permits & access
Permit required — see local rules.
  • Co-operative yugyoken required; spawning closure in autumn
  • Southern waters warm early — fish higher and cooler in summer.
What's coming
Plan ahead
5-day outlook
Gallery · 2
  1. Manai Falls at Takachiho Gorge
    Volcanic basalt gorge in Kyūshū.
  2. Terrain map of the venue
    Terrain map
Conservation note

White-spotted char (iwana) and yamame in the cooler upper water.

The full read · show the working · for Yamame · confidence 90%
How the 84 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time90 × 13%11.7
Pressure80 × 7%5.6
Insect activity68 × 12%8.2
Conditions total= 84
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 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