Freestone · Glacial · Aysén, CL

Río Aysén

Río Aysén terrain map

The Aysén carries the combined flow of the region's rivers down to the fjord at Puerto Chacabuco, and it fishes like the big water it is — glacial-alluvial, powerful, and best covered from a boat rather than waded.

Today · Closed season
Black Midge
Forecast · Today
Closed season
Season reopens 13 November. Plenty of other water available now.
75% projected
Today's fly
Black Midge
Black Midge
Conditions on the water · Today
Estimate
Level
Dry recently
No gauge reading
Water temp8.8°C
ClarityClearing
Weather7°C
WindN 4 km/h
Pressure1015 hPa
Rain · recent0.0 mm
Rain · ahead2.4 mm

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

Water temperature for Brown Trout
Cool — slow
9°C est.ideal 10–16°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.
Hatch timeline · todayPeak at 10am

12pm(now) — Black Midge

Stage: On emergersApproach: Emerger or dryActivity: 52%
Peak emergence window

Peak activity at 10am — Black Midge (Black Midge, Peak emergence window)

Evidence
Records-basedModerate confidence

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

Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Andesiops (Patagonian Olive)Hatch
3
3
3
2
2
3
3
Patagonian Mayfly (Large)Hatch
3
3
2
2
3
Smicridea (Patagonian Caddis)Hatch
3
3
3
2
2
3
Patagonian Stonefly (Large)Hatch
2
2
3
3

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.
  • Argentine Patagonian continental permit (or Chilean Sernapesca licence) required
  • Rules vary by province, National Park and reach — confirm annexes before fishing.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Río Blanco / Coyhaique-area support
28 km
Brown trout · Rainbow trout
Río Simpson
48 km
Brown trout · Rainbow trout
Río Mañihuales
49 km
Brown trout · Rainbow trout
Río Emperador Guillermo
53 km
Brown trout · Rainbow trout
Río Ñirehuao
76 km
Brown trout · Rainbow trout
About this water

The Aysén carries the combined flow of the region's rivers down to the fjord at Puerto Chacabuco, and it fishes like the big water it is — glacial-alluvial, powerful, and best covered from a boat rather than waded. Brown and rainbow trout hold in softer margins and back eddies out of the main push, while chinook salmon add real size and weight to the mix lower in the system. Streamers and sculpin patterns fished with authority, not finesse, are the order of the day, with dry-dropper rigs working the calmer side channels. It's less a wading river than a floating one, and a guide who knows the current channel configuration makes the difference between a good day and a frustrating one.

  • Glacial
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature62 × 28%17.4
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity23 × 12%2.8
Conditions total= 67
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
Related guides
Euro Nymphingsubsurface methods
Booking & contacts