Freestone · Granite Schist · Norte / Aveiro / Viseu

Paiva

5 km Passadiços de Paiva venue image
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Major Douro tributary — one of Portugal's most interesting fly-fishing rivers.

Marginal · Brown Trout
Klinkhåmer · 14-16
Marginallive now
Slow going — pick your moments
Low and clear — careful approach country. Cover and shadow are doing the work today.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp18.0°C
  • ClarityClear
Today’s fly
Klinkhåmer
Klinkhåmer14-16
Upstream dry, in the film
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp18.0°C
ClarityClear
Weather21°C
WindSE 4 km/h
Pressure1021 hPa
Rain · recent0.5 mm
Rain · ahead0.0 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

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.
Why this works
⚠️ Water at 18°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots. Otherwise fair — water clarity is in the right range.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 8 active hatches hour by hour with Pro.

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Evidence
ModelledModerate confidence

Modelled from regional ecology — no survey or occurrence data for this water yet.

Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
1
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1
GrannomHatch
1
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.
  • Licença de Pesca Desportiva (Portuguese fishing license)
  • Regional variation; consult local authorities.
What's coming
Plan ahead
5-day outlook
Water here around 18°C. Nothing cooler within range — carry a thermometer.
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

Major Douro tributary — one of Portugal's most interesting fly-fishing rivers. ICNF-classified salmonid water. Classic Iberian freestone structure with technical water. Wild brown trout in pretty, sometimes quite technical runs. Best March to June.

  • Granite schist
Water quality (WFD)
  • Ecology: Poor
  • Chemical: Unknown

WFD classification · PT03DOU0413

The full read · show the working · for brown trout · confidence 90%
How the 40 is built — score × weight = contribution
Temperature56 × 28%15.7
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity57 × 12%6.8
Conditions total= 72
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
  • Trout1 March → 31 July
Related guides
Euro Nymphingsubsurface methods
Booking & contacts