Freestone · Mixed · Asturias, Spain

Río Caudal

Río Caudal fishing venue photo
Marginal · Brown Trout
Ignita CDC · 16-20
Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
80% confidence
What moved it
  • Level1.40 mLast reading 5h ago
  • Water temp20.3°C
  • ClarityClear
Today's fly
IC
Ignita CDC16-20
Upstream dry, on top
Conditions on the water
Live gauge
Level
Steady
1.40 m
lowspate
Water temp20.3°C
ClarityClear
Weather22°C
WindN 9 km/h
Pressure1019 hPa
Rain · recent0.0 mm
Rain · ahead6.5 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
20°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
Water at 20.3°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 9 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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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
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
1

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Brown Trout fly box
Beats · 1
Mieres · 5.7 kmC&R trout
C&R trout stretch — Puente de Ujo to Puente La Perra.
Beat detail
Daily permit required, all fish returned
Upstream: Puente de Ujo
Downstream: Puente La Perra
Mieres beat map
Permits & access
Free state water
State rod licence required for trout / salmon as applicable.
  • Asturian fishing licence required
  • Check local cotos for trout regulations.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 2
Water here around 20°C — probably warm enough to stress Brown Trout . These are likely cooler.
Río Riosa
9.0 km
~18°C
Brown trout
Embalse de los Alfilorios
4.0 km
~20°C
Brown trout
Gallery · 3
  1. The central valley of Asturias is quite industrial but still has some mighty rivers
    The central valley of Asturias is quite industrial but still has some mighty rivers
  2. Rio Caudal, wide and fairly shallow with trout and lots of Spanish chub
    Rio Caudal, wide and fairly shallow with trout and lots of Spanish chub
  3. Terrain map of the venue
    Terrain map
The full read · show the working · for Brown Trout · confidence 80%
How the 26 is built — score × weight = contribution
Temperature21 × 28%5.9
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity61 × 12%7.3
Limiting factor: Water temperature (20.3°C) is outside Brown Trout's preferred range (10–16°C)= 60
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.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout Third Sunday of May → 15 August

    The Caudal joins the Nalón at Ujo/Mieres, well above Puente Peñaflor (Grado) — the Nalón's salmon-zone limit — so the whole Caudal system 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.

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