- Ecology: Good
- Chemical: Unknown
WFD classification · ES018MSPFES142MAR000750
Rules at a glance
- Public water
- Licence required
Water temperature for Brown Trout
Warm — slow18°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 12pm
12pm(now) — Heather Fly
Stage: Terrestrials on topApproach: Dry flyActivity: 95%
Also:Reed Smut62%Cinnamon Sedge45%Autumn Dun25%
Peak emergence windowWeather boost10 food groups active
Peak activity at 12pm — Heather Fly (Heather Fly, Peak emergence window)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
See what else is on the menu with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
March BrownHatch
2
3
2
Late March BrownHatch
2
3
2
Large Brook DunHatch
2
3
2
Large StoneflyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
Beats · 2
Güeña · 3.3 kmTrout permit
Trout permit stretch — Puente de madera junto a confluencia del Covadonga to Puente Cortijo la Gargantiella.
Beat detail
Daily permit required, keep within bag limits
Upstream: Puente de madera junto a confluencia del Covadonga
Downstream: Puente Cortijo la Gargantiella
Cangas de Onis · 1.4 kmC&R trout
C&R trout stretch — Puente Cortijo la Gargantiella to Confluencia con el Sella.
Beat detail
Daily permit required, all fish returned
Upstream: Puente Cortijo la Gargantiella
Downstream: Confluencia con el Sella
Permits & access
Free state water
State rod licence required for trout / salmon as applicable.
- Se requiere licencia asturiana de pesca
- En 2026 muchas aguas trucheras se extienden hasta el 15 de agosto, pero las zonas de salmón, las zonas de montaña, los tramos sin muerte y los tramos fronterizos pueden variar
- Comprueba las normas locales de coto y tramo antes de pescar.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 4
Upstream of Cangas de Onis 
Cangas de Onis 
At Cangas de Onis Terrain map
Water quality (WFD)
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow40 × 22%8.8
Clarity95 × 18%17.1
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity40 × 12%4.8
Conditions total= 70
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Related guides
Booking & contacts
Permits & access
- Pesca Fluvial Asturias — Permisos & Sorteo de CotosPermit information and the annual coto lottery (sorteo anual) for salmon, trout and reo. Run by the Principado de Asturias, not the Federación — the previous entry credited the Federación Asturiana de Pesca and pointed at fedpesca.com, which no longer resolves. The Federación does still exist, at asturianadepesca.com, but it is not the permit-allocation authority.
- Sede Asturias — Permisos de PescaAsturian fishing licence and salmon coto permits (sorteo lottery system)
Clubs & associations
Río Güeña
Water temperature for Brown Trout
Warm — slow18°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 12pm
12pm(now) — Heather Fly
Stage: Terrestrials on topApproach: Dry flyActivity: 95%
Also:Reed Smut62%Cinnamon Sedge45%Autumn Dun25%
Peak emergence windowWeather boost10 food groups active
Peak activity at 12pm — Heather Fly (Heather Fly, Peak emergence window)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
See what else is on the menu with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
March BrownHatch
2
3
2
Late March BrownHatch
2
3
2
Large Brook DunHatch
2
3
2
Large StoneflyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
Beats · 2
Güeña · 3.3 kmTrout permit
Trout permit stretch — Puente de madera junto a confluencia del Covadonga to Puente Cortijo la Gargantiella.
Beat detail
Daily permit required, keep within bag limits
Upstream: Puente de madera junto a confluencia del Covadonga
Downstream: Puente Cortijo la Gargantiella
Cangas de Onis · 1.4 kmC&R trout
C&R trout stretch — Puente Cortijo la Gargantiella to Confluencia con el Sella.
Beat detail
Daily permit required, all fish returned
Upstream: Puente Cortijo la Gargantiella
Downstream: Confluencia con el Sella
Permits & access
Free state water
State rod licence required for trout / salmon as applicable.
- Se requiere licencia asturiana de pesca
- En 2026 muchas aguas trucheras se extienden hasta el 15 de agosto, pero las zonas de salmón, las zonas de montaña, los tramos sin muerte y los tramos fronterizos pueden variar
- Comprueba las normas locales de coto y tramo antes de pescar.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 4
Upstream of Cangas de Onis Cangas de Onis At Cangas de Onis Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · ES018MSPFES142MAR000750
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow40 × 22%8.8
Clarity95 × 18%17.1
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity40 × 12%4.8
Conditions total= 70
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Related guides
Booking & contacts
Permits & access
- Pesca Fluvial Asturias — Permisos & Sorteo de CotosPermit information and the annual coto lottery (sorteo anual) for salmon, trout and reo. Run by the Principado de Asturias, not the Federación — the previous entry credited the Federación Asturiana de Pesca and pointed at fedpesca.com, which no longer resolves. The Federación does still exist, at asturianadepesca.com, but it is not the permit-allocation authority.
- Sede Asturias — Permisos de PescaAsturian fishing licence and salmon coto permits (sorteo lottery system)
Clubs & associations