Freestone · Granite · Brittany / Morbihan-Côtes-d'Armor

Blavet

Photo of Blavet
Contributor photo

Blavet — image via Wikipedia (Blavet)

Rhian (w:Flickr user Rhian vK) <CC BY 2.0>, via Wikimedia Commons

Brittany Atlantic salmon river flowing from Plouay toward the Atlantic.

Poor · Brown Trout
CDC Emerger · 16-18
Poorlive now
Not the day for it
River temperature is the limiting factor today, not the flow. This is not the day to push it. Check the thermal advice above before you head out.
90% confidence
What moved it
  • LevelLight rain recentlyNo gauge reading
  • Water temp22.0°C
  • ClarityClear
Today’s fly
CDC Emerger
CDC Emerger16-18
Dead-drift
Conditions on the water
Estimate
Level
Light rain recently
No gauge reading
Water temp22.0°C
ClarityClear
Weather19°C
WindNE 12 km/h
Pressure1017 hPa
Rain · recent7.8 mm
Rain · ahead27.8 mm

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

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
Through the open trout season. Spring olives and grannom; sedges through summer; small dark flies into autumn close.
Where
Pool tails and the seams behind boulders through the Morbihan-Côtes-d'Armor stretches. The Blavet runs Breton freestone water. The Blavet is a longer Morbihan-Côtes-d'Armor system with broader middle reaches.
Method
Upstream dry to risers; dry-dropper through the riffles. Breton spate freestone — fish 12 to 24 hours after rain on the drop. Long leader, fine tippet.
Kit
9 ft #4 — Breton spate freestone. Floating line, 12 ft leader to 4 lb fluoro. Studded boots.
Why this works
⛔ Water at 22°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayPeak at 6pm

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Sub-surface · on the nymphunder the surface

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Beyond the hatch · worth watchingambient prey

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Evidence
Survey-backed · regionalModerate confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
1
Trout seasonSeason
1
2
2
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.
  • AAPPMA permits
  • Check seasonal arrêté.
What's coming
Plan ahead
5-day outlook
Water here around 22°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Photo of Blavet
    Blavet — image via Wikipedia (Blavet)
  2. Terrain map of the venue
    Terrain map
About this water

Brittany Atlantic salmon river flowing from Plouay toward the Atlantic. Granitic geology provides rapid drainage and clear water. Spring salmon March–May peak with quick response to Atlantic rainfall. Fish rising phase when fresh water brings fish upstream. Standard Atlantic techniques: larger tubes in flood, dries as conditions drop. Sea trout excellent. Verify Morbihan regulations.

  • Granite
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown

WFD classification · FRGR1244

The full read · show the working · for brown trout · confidence 90%
How the 12 is built — score × weight = contribution
Temperature6 × 28%1.7
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity53 × 12%6.4
Limiting factor: Water temperature (22°C) is outside Brown Trout's preferred range (10–16°C)= 54
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.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Salmon1 March → 15 September
  • Trout2nd Saturday of March → 3rd Sunday of September

Salmon: Banned (2026) — Brittany 2026 order bans Atlantic salmon and sea trout on all Breton rivers.

Sea trout: Banned (2026) — Brittany 2026 order bans Atlantic salmon and sea trout on all Breton rivers.

Related guides
Pyrenees PlaybookFrench riversEuro Nymphingsubsurface methods
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