Mountain Freestone · Acidic Metamorphic · Sichuan, CN

Mengtun River 孟屯河

Mengtun River 孟屯河 terrain map
Good · Brown Trout
Gold Ribbed Hare's Ear · 14–16
Goodlive now
A proper day on the water
Low and clear — careful approach country. Stay small, stay accurate.
75% confidence
What moved it
  • LevelLight rain recentlyNo gauge reading
  • Water temp8.3°C
  • ClarityClear
Today's fly
Gold Ribbed Hare's Ear
Gold Ribbed Hare's Ear14–16
The general nymph — dead-drift it through runs and pockets when nothing specific is showing.
Conditions on the water
Estimate
Level
Light rain recently
No gauge reading
Water temp8.3°C
ClarityClear
Weather10°C
WindW 3 km/h
Pressure1023 hPa
Rain · recent5.9 mm
Rain · ahead2.5 mm

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

Water temperature for Brown Trout
Cool — slow
8°C est.ideal 1016°C
0°14°28°
How to fish it · for Brown Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Good — water clarity is right today, though time of day could be better.
Hatch timeline · todayPeak at 10am

Hatch predictions

Today's headline hatch shown — see all 12 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 4 with Pro.

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Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Ephemera japonica (Upstream Keiryu Mayfly)Hatch
2
3
2
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1

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

Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • Yangtze-basin ban water under 川农规〔2024〕2号
  • Angling is permitted outside designated year-round no-angling zones and outside the closed season (provincially 1 Mar – 30 Jun; Aba may set different dates totalling at least four months)
  • One rod, one line, maximum two hook points, hook gape under 2cm, no boats or rafts, ~2.5kg daily retention though a single fish over 2.5kg may be kept
  • ⚠️ Organised group trips must notify the county fishery authority 15 days in advance
  • Whether this exact reach lies inside a designated no-angling zone is unresolved — such zones must be signed on the bank, so a local guide can settle it
  • Never target Sichuan taimen
What's coming
Plan ahead
5-day outlook
Conservation note

⚠️ Unresolved and consequential. The published first-person account calls the fish white-spotted char (iwana); that is almost certainly wrong, as there is no native Salvelinus in Sichuan. The resident outfitter describes the region's fishing as Euro-nymphing for snow trout — Schizothorax, a montane cyprinid, not a salmonid. Schizothorax species were added to the 国家重点保护野生动物名录 in 2021, so the quarry here may itself be protected: resolve the exact species and its listing status before treating this as a fishable target. 🚫 Sichuan taimen (Hucho bleekeri), state-protected and critically endangered, occurs in these upper-Min headwaters and must never be targeted. Species are prose-only; none is scored. / ⚠️ 鱼种存疑且影响重大。已发表的第一手记述称所钓为白斑红点鲑(岩鱼),此说几乎可以肯定有误——四川并无本土红点鲑属鱼类。当地渔具商将本区钓法描述为以欧式若虫钓法钓“雪鳟”,即裂腹鱼,属鲤科高原鱼类而非鲑科。裂腹鱼属多种已于2021年列入国家重点保护野生动物名录,故此地对象鱼本身可能受保护:在视其为可钓对象之前,须先确认具体种类及其保护级别。🚫 川陕哲罗鲑属国家重点保护、极危物种,分布于岷江上游源头水域,绝不可作为垂钓对象。本条目鱼种仅作文字说明,不参与计分。

The full read · show the working · for Brown Trout · confidence 75%
How the 73 is built — score × weight = contribution
Temperature70 × 28%19.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity64 × 12%7.7
Conditions total= 74
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Related guides
Booking & contacts