Spate · Slate · Asturias, Spain

Río Ibias

Ibias venue image
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The Ibias is wild moorland water — slate country trout fishing at its purest.

Species

A side-water session, not the main event

Low and clear — careful approach country. Long leader, small flies, slower casts.

55% confidence in this read
Water temperature for brown trout
Cool — slow
6°C est.ideal 10–16°C
0°14°28°
Why this score · for brown trout
  • Temperature2928% weight
  • Flow4022% weight
  • Clarity9518% weight
  • Feeding Time4513% weight
  • Pressure807% weight
  • Prey Activity1612% weight
Conditions
Level
0.43 m
Water temp
5.5°C
Estimated
Clarity
Clear
Air temp
6°C
Wind
S 5 km/h
Calm
Pressure
1019 hPa
Rain · 48h
0.8 mm
No meaningful rain
Rain · ahead
1.1 mm
No meaningful rain · next 48h

Live readings — water temperature is an estimate where the gauge does not record it.

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
Fair conditions. Clarity is favourable (95), Prey activity is weakest (16).
Through the year
0–3 scale · May highlighted
J
F
M
A
M
J
J
A
S
O
N
D
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.

Gallery · 1
  1. Terrain map of the venue
    Terrain map
Permits & access
Free state water
State rod licence required for trout / salmon as applicable.
  • Asturian fishing licence required
  • In 2026 many trout waters run to 15 August, but salmon zones, mountain zones, tramos sin muerte, and border stretches can differ
  • Check local coto and tramo rules before fishing.
Directions
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About this water

The Ibias is wild moorland water — slate country trout fishing at its purest. Responsive (4 hours to spate) and often uncrowded, but not free of paperwork: Asturian licence and local tramo rules still matter. Wild browns (15–28 cm, with larger residents in pools) reward accurate presentation and patient observation. Mayfly and sedge hatches May–June; terrestrials work well in summer. Straightforward access from the road. A river that asks only for honest attention.

Under the surface

The Ibias feeds the Narcea from the northeast, a slate-and-quartzite river with pronounced spate characteristics. The upper reaches run through step-pool and pocket water on Cantabrian mixed lithology; the descent is steep and the response to rainfall immediate. The river maintains its spate character throughout — responsive, amber-coloured with slate fines, and belonging fully to the Narcea's drainage network. The middle reaches allow pool-riffle sequences to develop on cobble; the pools are secondary features here, brief pauses in a river that's defined by its response to weather and its connection to the high Cantabrian country. The wading demands respect throughout.

Wading: Slick wet slate

  • Slate
  • Confined
  • Cascade
  • Step pool
Other water nearby · 5
Booking & contacts