Stoneflies
Caddisflies
Gammarids
Upper Mondego rising in the Serra da Estrela flows through mountain water with wild brown trout. The upper basin above Nelas has the best fly fishing. Spring and early summer are the working months before heat arrives.
- Granite
Rules at a glance
- Public water
- Licence required
Water temperature for Brown Trout
Ideal15°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.
Likely species
Caddisflies
- CapererMost likelyLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
- Net-spinning caddisAlso possibleLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
Hatch timeline · todayPeak at 6pm
12pm(now) — Reed Smut
Stage: On emergersApproach: Emerger or dryActivity: 36%
Also:Cinnamon Sedge34%
Peak emergence windowWeather boost10 food groups active
Peak activity at 6pm — Evening Sedge (Evening Sedge, Weather boost)
Sub-surface · on the nymphunder the surface
Hatch predictions
Supporters see the full sub-surface read.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 2 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · September 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
Brown SedgeHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
A wild brown trout pack for northern and mountain Portugal. River-first, compact, and practical, with nymphs leading and dry flies taking over in the stronger windows.
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
Other water nearby · 3
Gallery · 2
Rio Mondego - Portugal Terrain map
About this water
Water quality (WFD)
- Ecology: Good
- Chemical: Good
What this classification means
WFD re-coded 2026-06-18: prior id PT04MON0614 actually identifies the Rio Seia — this river was mis-tagged to a neighbouring water body. Re-mapped to PT04MON0606. Status: EEA WISE 2022 (3rd RBMP). Confidence: medium — VERIFY upper-Mondego reach. Source: discodata.eea.europa.eu.
WFD classification · PT04MON0606
The full read · show the working · for Brown Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature96 × 28%26.9
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity67 × 12%8.0
Conditions total= 80
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Trout 1 March → 31 July
Related guides
Booking & contacts
Mondego (Upper Basin)
Upper Mondego rising in the Serra da Estrela flows through mountain water with wild brown trout.
Water temperature for Brown Trout
Ideal15°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.
Likely species
Caddisflies
- CapererMost likelyLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
- Net-spinning caddisAlso possibleLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
Hatch timeline · todayPeak at 6pm
12pm(now) — Reed Smut
Stage: On emergersApproach: Emerger or dryActivity: 36%
Also:Cinnamon Sedge34%
Peak emergence windowWeather boost10 food groups active
Peak activity at 6pm — Evening Sedge (Evening Sedge, Weather boost)
Sub-surface · on the nymphunder the surface
Hatch predictions
Supporters see the full sub-surface read.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 2 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · September 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
Brown SedgeHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
A wild brown trout pack for northern and mountain Portugal. River-first, compact, and practical, with nymphs leading and dry flies taking over in the stronger windows.
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
Other water nearby · 3
Gallery · 2
Rio Mondego - Portugal Terrain map
About this water
Upper Mondego rising in the Serra da Estrela flows through mountain water with wild brown trout. The upper basin above Nelas has the best fly fishing. Spring and early summer are the working months before heat arrives.
- Granite
Water quality (WFD)
- Ecology: Good
- Chemical: Good
What this classification means
WFD re-coded 2026-06-18: prior id PT04MON0614 actually identifies the Rio Seia — this river was mis-tagged to a neighbouring water body. Re-mapped to PT04MON0606. Status: EEA WISE 2022 (3rd RBMP). Confidence: medium — VERIFY upper-Mondego reach. Source: discodata.eea.europa.eu.
WFD classification · PT04MON0606
The full read · show the working · for Brown Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature96 × 28%26.9
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity67 × 12%8.0
Conditions total= 80
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Trout 1 March → 31 July
Related guides
Booking & contacts