Freestone · Limestone · Catalonia

Muga

Muga venue image
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The Muga flows near the French border as the northernmost Catalan river.

Poor · Brown Trout
Klinkhammer · 14-18
Poorlive now
Not the day for it
Low and clear — careful approach country. A morning for the obvious fish only.
90% confidence
What moved it
  • Flow2.4 m³/sLast reading 18h ago
  • Water temp22.2°C
  • ClarityClear
Today’s fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Flow
Steady
2.4 m³/s
Last reading 18h ago
Water temp22.2°C
ClarityClear
Weather31°C
WindN 17 km/h
Pressure1020 hPa
Rain · recent0.2 mm
Rain · ahead0.0 mm

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

Water temperature for brown trout
Warm — slow
22°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 22.2°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 5 active hatches hour by hour with Pro.

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Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
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
Permits & access
Permit required — see local rules.
  • Catalan fishing licence required
  • Controlled trout waters may require a ZPC permit, and legal dates differ between low-mountain, high-mountain, with-kill, and no-kill sectors, so check the current Generalitat rules for the exact zone.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 3
Probably above the brown trout safety line — these are likely cooler, but carry a thermometer.
Tech
42 km
~14°C
Brown trout · Grayling
Freser
66 km
~14°C
Brown trout
Ter
61 km
~15°C
Brown trout
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

The Muga flows near the French border as the northernmost Catalan river. Limestone karst geology produces clear, alkaline freestone water with strong wild-trout genetics. One protected salmonid zone alongside managed stocking sections provides diverse fishing options.

  • Limestone
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown
What this classification means

WFD ecological status Bad → Good corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody ES100MSPF2200030 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · ES100MSPF2200030

The full read · show the working · for brown trout · confidence 90%
How the 10 is built — score × weight = contribution
Temperature5 × 28%1.4
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity47 × 12%5.6
Limiting factor: Water temperature (22.2°C) is outside Brown Trout's preferred range (10–16°C)= 56
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
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
  • Troutdepends on Catalan zone class → depends on Catalan zone class
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts