Freestone · Granite Schist · Valle d'Aosta

Ayasse

Fiume Ayasse venue image
Poor · Rainbow Trout
Small Streamer · 6-10
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
  • Level0.09 mLast reading 6h ago
  • Water temp32.7°C
  • ClarityClear
Today's fly
SS
Small Streamer6-10
Swing, sub-surface
Conditions on the water
Live gauge
Level
Steady
0.09 m
Last reading 6h ago
Water temp32.7°C
ClarityClear
Weather21°C
WindNW 7 km/h
Pressure1026 hPa
Rain · recent1.7 mm
Rain · ahead10.1 mm

Live readings only. Trends shown where the gauge supports them.

Water temperature for Rainbow Trout
Welfare risk
32.7°Cideal 10–18°C
0°14°28°
How to fish it · for Rainbow Trout
When
Stocked weekly, so the best fishing often follows a fresh drop — ask locally or simply fish soon after the season opens on 18 April. Runs to 14 October, dawn to dusk, seven days a week.
Where
The two-kilometre reserve between the old Brun intake and the Mellier canal — deep pools alternating with longer shallow glides, typical steep-valley torrent structure.
Method
Nothing fussy — spinner, bait or fly all take fish here, and there's no catch-and-release requirement. Minimum size 25cm, six fish per permit, up to three permits a day.
Kit
9 ft #5/6 for a small mountain torrent. Nymph or small streamer on a floating line covers most of the water.
Why this works
Water at 32.7°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Likely species
Mayflies
  • Blue-winged oliveMost likely
    #16–18 · Dun
    Duns are up; a sherry spinner fall may follow.
  • Large dark oliveAlso possible
    #14–16 · Emerger
    Dead-drift the emerger — it's sitting in the film.
Caddisflies
  • Net-spinning caddis (S. Europe)Most likelyLower confidence
    #12–14–16 · Pupa
    Widespread riffle net-spinner; evening emergence.
  • Satin sedgeAlso possibleLower confidence
    #12–14 · Egg-laying
    Skitter it at dusk — this one's fished, not dead-drifted.
Hatch timeline · todayPeak at 6pm

Hatch predictions

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Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey

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Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
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
Rainbow Trout fly box
SS
Small StreamerTop
6-10 · Pattern
Swing, sub-surface
Permits & access
Permit required — see local rules.
  • Managed tourist reserve (riserva a cattura) — daily permit required, weekly stocking
  • Minimum size 25cm, 6 fish per permit, maximum 3 permits per angler per day
  • No catch-and-release requirement.
What's coming
Plan ahead
5-day outlook
Water here at 32.7°C. Nothing cooler within range.
Gallery · 1
  1. Terrain map of the venue
    Terrain map
The full read · show the working · for Rainbow Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature0 × 28%0.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time80 × 13%10.4
Pressure75 × 7%5.3
Insect activity60 × 12%7.2
Limiting factor: Water temperature (32.7°C) is outside Rainbow Trout's preferred range (10–18°C)= 56
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
What would change the calculation
Cooler water — back toward the 10–18 °C ideal band — would lift the score and ease welfare.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Rainbow trout 2026-04-18 → 2026-10-14
Related guides
Euro Nymphingsubsurface methods
Booking & contacts