Freestone · Volcanic · Kyūshū

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.

Poor · Yamame
Tenkara kebari (reverse-hackle) · 12–16
Poorlive now
Not the day for it
Low and clear — careful approach country. A morning for the obvious fish only.
90% confidence
What moved it
  • LevelModerate rain recentlyNo gauge reading
  • Water temp22.3°C
  • ClarityClear
Today's fly
TK
Tenkara kebari (reverse-hackle)12–16
A dependable searching pattern for these waters.
Conditions on the water
Estimate
Level
Moderate rain recently
No gauge reading
Water temp22.3°C
ClarityClear
Weather22°C
WindSE 4 km/h
Pressure1007 hPa
Rain · recent16.3 mm
Rain · ahead0.0 mm

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

Water temperature for Yamame
Warm — slow
22°C est.ideal 916°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
Water at 22.3°C. This is the line where catch-and-release kills masu salmon. Do not fish for them today.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 3 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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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.

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
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
Water here around 22°C. Nothing cooler within range — carry a thermometer.
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 2 is built — score × weight = contribution
Temperature1 × 28%0.3
Flow45 × 22%9.9
Clarity95 × 18%17.1
Feeding Time20 × 13%2.6
Pressure80 × 7%5.6
Insect activity49 × 12%5.9
Limiting factor: Water temperature (22.3°C) is outside Yamame's preferred range (9–16°C)= 41
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 9–16 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
  • Char late February to Aprillate 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