Freestone · Volcanic · Kyūshū, JP

Gokase River (Takachiho)

Manai Falls at Takachiho Gorge

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 Japanese legends — holding yamame and iwana in its cooler upper water.

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
Spring to the autumn closure; cooler upper reaches in high summer
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 6am

12pm(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 6am — 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
Yamame fly box
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
About this water

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 Japanese legends — holding yamame and iwana in its cooler upper water. The southern edge of Japanese salmonid country, fishing in a landscape of myth and volcanic rock.

Under the surface

A river of the Miyazaki volcanic highlands, threading the legendary basalt gorge of Takachiho with its columned cliffs and waterfalls. Yamame and iwana hold in the cooler upper reaches — the southern frontier of Japanese mountain-stream fishing, in a place of deep myth.

Wading: Warm edge southern water, slick basalt

  • River
  • Volcanic
  • Confined
  • Pool riffle
  • Pocket water
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
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
Booking & contacts