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.
Marginal · Brown Trout
Small Chironomid · 22-24
Marginallive now
Slow going — pick your moments
Low and clear — careful approach country. Cover and shadow are doing the work today.
50% confidence
What moved it
  • Level0.26 mLast reading 3h ago
  • Water temp13.2°C
  • ClarityClear
Today's fly
SC
Small Chironomid22-24
Upstream dry, on top
Conditions on the water
Live gauge
Level
Steady
0.26 m
lowspate
Water temp13.2°C
ClarityClear
Weather12°C
WindS 5 km/h
Pressure1025 hPa
Rain · recent0.0 mm
Rain · ahead0.1 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
Ideal
13°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.
Why this works
Poor — water temperature is working for you, but river flow is the limiting factor today.
Hatch timeline · todayQuiet day

Hatch predictions

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Sub-surface · on the nymphunder the surface

Hatch predictions

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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 · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
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
SC
Small ChironomidTop
22-24 · Pattern
Upstream dry, on top
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
19 km
82
Brown trout
Río Caudal
24 km
80
Brown trout
Río Lena
15 km
30
Brown trout
Embalse de los Alfilorios
21 km
Brown trout
Embalse de Tanes
23 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 50%
How the 30 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow15 × 22%3.3
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity16 × 12%1.9
Limiting factor: River is stable — Brown Trout prefers medium flow= 63
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout Dritter Sunday im 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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