Spate · Mixed · Asturias, Spain

Río Aller

The Río Aller, a gravel-bedded river lined with trees, flowing through a green valley near Bustiello, Asturias, Spain.
Poor · Brown Trout
Ignita CDC · 16-20
Closed season
Out of season. Plenty of other water available now.
Closed — confidence not applicable today.
What moved it
  • Level0.16 mLast reading 7h ago
  • Water temp17.5°C
  • ClarityClear
Today's fly
IC
Ignita CDC16-20
Upstream dry, on top
Conditions on the water
Live gauge
Level
Steady
0.16 m
lowspate
Water temp17.5°C
ClarityClear
Weather17°C
WindNW 5 km/h
Pressure1020 hPa
Rain · recent0.0 mm
Rain · ahead2.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Brown Trout
Warm — slow
18°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 · todayQuiet day

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Sub-surface · on the nymphunder the surface

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Beyond the hatch · worth watchingambient prey

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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
Trout seasonSeason
1
2
2
1
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
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
Aller · 5.2 kmTrout permit
Trout permit stretch — Puente La Barraca en Collanzo to Puente de Bello.
Beat detail
Daily permit required, keep within bag limits
Upstream: Puente La Barraca en Collanzo
Downstream: Puente de Bello
Aller beat map
San Isidro · 3.8 kmTrout permit
Trout permit stretch — Puente de los Gallegos to Puente de Llanos.
Beat detail
Daily permit required, keep within bag limits
Upstream: Puente de los Gallegos
Downstream: Puente de Llanos
San Isidro beat map
Permits & access
Free state water
State rod licence required for trout / salmon as applicable.
  • Asturian fishing licence required
  • Check local trout regulations — some stretches may be vedado (closed).
What's coming
Plan ahead
5-day outlook
Fishing better nearby · 5
Río Riosa
20 km
67
Brown trout
Río Lena
15 km
30
Brown trout
Embalse de los Alfilorios
22 km
Brown trout
Embalse de Tanes
23 km
Brown trout
Río Torío
25 km
Brown trout
Gallery · 2
  1. The Río Aller, a gravel-bedded river lined with trees, flowing through a green valley near Bustiello, Asturias, Spain.
    Río Aller
  2. Terrain map of the venue
    Terrain map
The full read · show the working · for Brown Trout · confidence 55%
How the 0 is built — score × weight = contribution
Temperature66 × 28%18.5
Flow15 × 22%3.3
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity37 × 12%4.4
Limiting factor: River is stable — Brown Trout prefers medium flow= 59
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
A drop and clear would lift the flow and clarity scores.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout Third Sunday of May → 15 August

    The Aller feeds the Caudal, itself a Nalón tributary joining well above Puente Peñaflor (Grado) — the Nalón's salmon-zone limit — so it sits in the mountain-zone tributary network. Mountain-zone trout (zona de alta montaña): opens Third Sunday of May, not the general 15 March, minimum size 17cm (vs. 19cm general). Asturian regulation classifies any tributary joining above a salmon river's designated zone-limit point as alta montaña water. Inferred here from confluence position, not a verified lookup against the official cotos map (pescafluvial.asturias.es) — confirm before treating as final.

Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
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