Mayflies
Stoneflies
Gammarids
- Ecology: Good
- Chemical: Unknown
WFD classification · ES018MSPFES244MAR002280
Rules at a glance
- Public water
- Licence required
Water temperature for Brown Trout
Cool — slow8°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Slate water keeps an amber tint that suits dry-fly to within an hour of last light. Through the open trout season — March in zonas libres, May onwards in salmon zones.
Where
Step-pool sequences in the upper reaches; the middle Eo settles into pool-riffle on slate cobble. Watch the slabs — good lies for trout, treacherous wading underfoot.
Method
Dry to risers in the long glides, short-line nymph through the step-pools and pocket water. Slate water reads darker than limestone — a smaller, drabber pattern works better than the bright stuff that fishes on the Sella.
Kit
9 ft #4 upper, 9 ft #5 middle. Floating line, 12 ft leader to 4 lb fluoro. Slate slabs look secure and aren't — wading staff.
Why this works
Good — water clarity is working for you, but river flow is the limiting factor today.
Likely species
Hatch timeline · tomorrowPeak at 11:00
12:00(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 87%
Also:Iron Blue46%Black Gnat45%
Peak emergence window5 food groups active
Peak activity at 11:00 — Autumn Needle Fly (Autumn Needle Fly, Peak emergence window)
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
1
Trout seasonSeason
1
2
2
2
2
1
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
Fly box · Brown Trout
Top
22-24 · Pattern
Upstream dry, on top
Beats · 6
Cairo · 1.7 kmSorteo
Sorteo stretch — Puente Traslacorde to Frente cruce de carretera Vilaoruz-Foxas.
Beat detail
Sorteo (lottery) permit required
Upstream: Puente Traslacorde
Downstream: Frente cruce de carretera Vilaoruz-Foxas
Pedrido · 1.5 kmC&R
C&R stretch — Frente cruce de carretera Vilaoruz-Foxas to 50 m aguas arriba de la presa de Saltadoiro.
Beat detail
Sorteo permit, all fish returned
Upstream: Frente cruce de carretera Vilaoruz-Foxas
Downstream: 50 m aguas arriba de la presa de Saltadoiro
Estreitos · 1.5 kmSorteo
Sorteo stretch — Pozo de Estreitos 200 m aguas abajo de la pasarela de Piagomayor to Puente del ferrocarril.
Beat detail
Sorteo (lottery) permit required
Upstream: Pozo de Estreitos 200 m aguas abajo de la pasarela de Piagomayor
Downstream: Puente del ferrocarril
Louredal · 1.0 kmSorteo
Sorteo stretch — Puente del ferrocarril to Pasarela de la Volta.
Beat detail
Sorteo (lottery) permit required
Upstream: Puente del ferrocarril
Downstream: Pasarela de la Volta
Volta · 1.0 kmFree Tue/Wed/Sat
Free Tue/Wed/Sat stretch — Pasarela de la Volta to Cabecera pozo Vixato, 150 m aguas abajo del puente La Negra.
Beat detail
Free on Tue/Wed/Sat, sorteo on other days
Upstream: Pasarela de la Volta
Downstream: Cabecera pozo Vixato, 150 m aguas abajo del puente La Negra
Gonzalvo · 1.3 kmSorteo
Sorteo stretch — Cabecera pozo Vixato to Anguieiro cabecera pozo Florentino.
Beat detail
Sorteo (lottery) permit required
Upstream: Cabecera pozo Vixato
Downstream: Anguieiro cabecera pozo Florentino
Beat map
Illustration · Studio Daisy
Permits & access
Free state water
State rod licence required for trout / salmon as applicable.
- Adjudicación de tramos por sorteo a través de la Federación Asturiana de Pesca
- Se requiere licencia de pesca + permiso de coto
- Para 2026, el cupo de salmón es de 1 ejemplar por día y 1 por temporada, de los cuales solo 1 puede sacrificarse
- Consulta las normas específicas del coto, los vedados y las restricciones de aparejos antes de pescar.
What's coming
Plan ahead
5-day outlook
Fishing better nearby · 5
Gallery · 6
Río Eo from the Vía Verde 
Río Eo at A Pontenova 
Río Eo riverside at A Pontenova 
Río Eo at Baleira 
Salmon ladder at Pé da Viña, Río Eo Terrain map
Water quality (WFD)
The full read · show the working · for Brown Trout · confidence 75%
How the 64 is built — score × weight = contribution
Temperature60 × 28%16.8
Flow40 × 22%8.8
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity41 × 12%4.9
Conditions total= 64
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
Directions
Seasons & zones
- Trout Tercer Sunday de March → 15 August
4 zones — different rules apply
- Coto salmonero
Main Eo salmon beats: Cairo, Estreitos, Louredal, Gonzalvo, La Peña, Reiboa, Louside, Las Barcas, El Carbayón, Pozón, Canabeiras — most shared with Galicia
- Salmon: Tercer Saturday de April → 15 July · 1 per day, 1 per season (kill limit)
- Sea trout: follows Trout
- Trout: Tercer Sunday de May → 31 July
- Coto salmonero sin muerte
Pedrido sin muerte beat (shared with Galicia)
- Salmon: Tercer Saturday de April → 15 July
- Sea trout: follows Trout
- Trout: Tercer Sunday de May → 31 July
- Coto parcial
Volta coto parcial — middle river
- Salmon: Tercer Saturday de April → 15 July · 1 per day, 1 per season (kill limit)
- Sea trout: follows Trout
- Trout: Tercer Sunday de March → 31 July
- Zona libre
Non-coto stretches of the Eo — free-access trout water
- Sea trout: follows Trout
- Trout: Tercer Sunday de March → 31 July
Sea trout: Variable seasonal (2026) — Eo — the Galicia-Asturias border river. Reo and salmon fishery with regulatory complexity (both regional administrations). Sea trout run from the estuary on rising water. Condition-sensitive; regulated access. Night fishing rules vary by bank (Galician vs Asturian side).
Salmon: Heritage only (2026) — Heritage Asturian salmon river — was classic Atlantic salmon and sea trout water until recent decades, now with negligible salmon runs. Listed as 'historic' to acknowledge identity without promoting salmon fishing. Brown trout and (limited) sea trout remain of interest.
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
- Real Asociación Asturiana de Pesca FluvialPermit required · Real Asociación Asturiana de Pesca Fluvial · Association membership does not replace the official Principado permit.
- Pesca Fluvial AsturiasPermit required · Official coto and tramo framework · Licence and, where required, day permit are official.
Río Eo
Water temperature for Brown Trout
Cool — slow8°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Slate water keeps an amber tint that suits dry-fly to within an hour of last light. Through the open trout season — March in zonas libres, May onwards in salmon zones.
Where
Step-pool sequences in the upper reaches; the middle Eo settles into pool-riffle on slate cobble. Watch the slabs — good lies for trout, treacherous wading underfoot.
Method
Dry to risers in the long glides, short-line nymph through the step-pools and pocket water. Slate water reads darker than limestone — a smaller, drabber pattern works better than the bright stuff that fishes on the Sella.
Kit
9 ft #4 upper, 9 ft #5 middle. Floating line, 12 ft leader to 4 lb fluoro. Slate slabs look secure and aren't — wading staff.
Why this works
Good — water clarity is working for you, but river flow is the limiting factor today.
Likely species
Hatch timeline · tomorrowPeak at 11:00
12:00(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 87%
Also:Iron Blue46%Black Gnat45%
Peak emergence window5 food groups active
Peak activity at 11:00 — Autumn Needle Fly (Autumn Needle Fly, Peak emergence window)
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
1
Trout seasonSeason
1
2
2
2
2
1
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
Fly box · Brown Trout
Top
22-24 · Pattern
Upstream dry, on top
Beats · 6
Cairo · 1.7 kmSorteo
Sorteo stretch — Puente Traslacorde to Frente cruce de carretera Vilaoruz-Foxas.
Beat detail
Sorteo (lottery) permit required
Upstream: Puente Traslacorde
Downstream: Frente cruce de carretera Vilaoruz-Foxas
Pedrido · 1.5 kmC&R
C&R stretch — Frente cruce de carretera Vilaoruz-Foxas to 50 m aguas arriba de la presa de Saltadoiro.
Beat detail
Sorteo permit, all fish returned
Upstream: Frente cruce de carretera Vilaoruz-Foxas
Downstream: 50 m aguas arriba de la presa de Saltadoiro
Estreitos · 1.5 kmSorteo
Sorteo stretch — Pozo de Estreitos 200 m aguas abajo de la pasarela de Piagomayor to Puente del ferrocarril.
Beat detail
Sorteo (lottery) permit required
Upstream: Pozo de Estreitos 200 m aguas abajo de la pasarela de Piagomayor
Downstream: Puente del ferrocarril
Louredal · 1.0 kmSorteo
Sorteo stretch — Puente del ferrocarril to Pasarela de la Volta.
Beat detail
Sorteo (lottery) permit required
Upstream: Puente del ferrocarril
Downstream: Pasarela de la Volta
Volta · 1.0 kmFree Tue/Wed/Sat
Free Tue/Wed/Sat stretch — Pasarela de la Volta to Cabecera pozo Vixato, 150 m aguas abajo del puente La Negra.
Beat detail
Free on Tue/Wed/Sat, sorteo on other days
Upstream: Pasarela de la Volta
Downstream: Cabecera pozo Vixato, 150 m aguas abajo del puente La Negra
Gonzalvo · 1.3 kmSorteo
Sorteo stretch — Cabecera pozo Vixato to Anguieiro cabecera pozo Florentino.
Beat detail
Sorteo (lottery) permit required
Upstream: Cabecera pozo Vixato
Downstream: Anguieiro cabecera pozo Florentino
Beat map
Illustration · Studio Daisy
Permits & access
Free state water
State rod licence required for trout / salmon as applicable.
- Adjudicación de tramos por sorteo a través de la Federación Asturiana de Pesca
- Se requiere licencia de pesca + permiso de coto
- Para 2026, el cupo de salmón es de 1 ejemplar por día y 1 por temporada, de los cuales solo 1 puede sacrificarse
- Consulta las normas específicas del coto, los vedados y las restricciones de aparejos antes de pescar.
What's coming
Plan ahead
5-day outlook
Fishing better nearby · 5
Gallery · 6
Río Eo from the Vía Verde Río Eo at A Pontenova Río Eo riverside at A Pontenova Río Eo at Baleira Salmon ladder at Pé da Viña, Río Eo Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · ES018MSPFES244MAR002280
The full read · show the working · for Brown Trout · confidence 75%
How the 64 is built — score × weight = contribution
Temperature60 × 28%16.8
Flow40 × 22%8.8
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity41 × 12%4.9
Conditions total= 64
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
Directions
Seasons & zones
- Trout Tercer Sunday de March → 15 August
4 zones — different rules apply
- Coto salmonero
Main Eo salmon beats: Cairo, Estreitos, Louredal, Gonzalvo, La Peña, Reiboa, Louside, Las Barcas, El Carbayón, Pozón, Canabeiras — most shared with Galicia
- Salmon: Tercer Saturday de April → 15 July · 1 per day, 1 per season (kill limit)
- Sea trout: follows Trout
- Trout: Tercer Sunday de May → 31 July
- Coto salmonero sin muerte
Pedrido sin muerte beat (shared with Galicia)
- Salmon: Tercer Saturday de April → 15 July
- Sea trout: follows Trout
- Trout: Tercer Sunday de May → 31 July
- Coto parcial
Volta coto parcial — middle river
- Salmon: Tercer Saturday de April → 15 July · 1 per day, 1 per season (kill limit)
- Sea trout: follows Trout
- Trout: Tercer Sunday de March → 31 July
- Zona libre
Non-coto stretches of the Eo — free-access trout water
- Sea trout: follows Trout
- Trout: Tercer Sunday de March → 31 July
Sea trout: Variable seasonal (2026) — Eo — the Galicia-Asturias border river. Reo and salmon fishery with regulatory complexity (both regional administrations). Sea trout run from the estuary on rising water. Condition-sensitive; regulated access. Night fishing rules vary by bank (Galician vs Asturian side).
Salmon: Heritage only (2026) — Heritage Asturian salmon river — was classic Atlantic salmon and sea trout water until recent decades, now with negligible salmon runs. Listed as 'historic' to acknowledge identity without promoting salmon fishing. Brown trout and (limited) sea trout remain of interest.
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
- Real Asociación Asturiana de Pesca FluvialPermit required · Real Asociación Asturiana de Pesca Fluvial · Association membership does not replace the official Principado permit.
- Pesca Fluvial AsturiasPermit required · Official coto and tramo framework · Licence and, where required, day permit are official.