Rules at a glance
- Fly only
Water temperature for Brown Trout
Cool — slow8°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.
Likely species
Stoneflies
Stoneflies- Patagonian stonefliesMost likely#6–8–10–12 · NymphLarge nymphs in riffles; adults are a bonus.
Hatch timeline · todayPeak at 10h
Hatch predictions
Today's headline hatch shown — see all 3 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
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
Sea trout runRun
2
2
2
2
1
1
2
Trout seasonSeason
2
2
2
2
1
1
2
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
Fly box · Brown Trout
Permits & access
Permit required — see local rules.
- Tierra del Fuego provincial permit required
- Mandatory catch-and-release of all salmonids on the Irigoyen; fly fishing only on the section bordering Estancia María Luisa (spinning permitted on the rest of the river)
- Confirm the current provincial season annex before fishing.
What's coming
Plan ahead
5-day outlook
Other water nearby · 1
Gallery · 1
Terrain map
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature72 × 28%20.2
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity41 × 12%4.9
Conditions total= 69
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Sea trout 1 November → 1 May
- Trout 1 November → 1 May
Sea trout: Variable seasonal (2026)
Related guides
Booking & contacts
Río Irigoyen
Water temperature for Brown Trout
Cool — slow8°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.
Likely species
Stoneflies
- Patagonian stonefliesMost likely#6–8–10–12 · NymphLarge nymphs in riffles; adults are a bonus.
Hatch timeline · todayPeak at 10h
Hatch predictions
Today's headline hatch shown — see all 3 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
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
Sea trout runRun
2
2
2
2
1
1
2
Trout seasonSeason
2
2
2
2
1
1
2
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
Fly box · Brown Trout
Permits & access
Permit required — see local rules.
- Tierra del Fuego provincial permit required
- Mandatory catch-and-release of all salmonids on the Irigoyen; fly fishing only on the section bordering Estancia María Luisa (spinning permitted on the rest of the river)
- Confirm the current provincial season annex before fishing.
What's coming
Plan ahead
5-day outlook
Other water nearby · 1
Gallery · 1
Terrain map
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature72 × 28%20.2
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity41 × 12%4.9
Conditions total= 69
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Sea trout 1 November → 1 May
- Trout 1 November → 1 May
Sea trout: Variable seasonal (2026)
Related guides
Booking & contacts