Stoneflies
Brown trout and marble trout in the water, with some sections regulated by hydro releases. Good dry fly fishing during caddis hatches when the light is right.
- Mixed
Rules at a glance
- Licence required
Water temperature for Brown Trout
Cool — slow5°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the Italian trout season — afternoon hatches in spring; dawn and dusk in summer warm. Val di Fiemme and Val di Fassa fish high-elevation cold water.
Where
Pool tails, riffle heads, and the seams through the dolomite gorges. The Avisio runs cleaner pocket water than the glacial Sarca and Noce.
Method
Upstream nymph through the broken water; dry to risers in the glides. Italian No-Kill stretches mandate single barbless — comply or fish elsewhere.
Kit
9 to 10 ft #4 for medium freestone with Alpine clarity. Floating line, 12 ft leader to 4 to 5 lb fluoro. Studded boots — Alpine cobble runs slick.
Likely species
Hatch timeline · todayQuiet day
Low insect activity predicted today
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 3 guilds 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 · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Evening SedgeHatch
2
3
3
3
2
Alpine RhithrogenaHatch
1
2
2
1
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
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 fuller Italian trout and grayling box for the southern Alps and northern limestone/alpine systems. It keeps the marble-trout streamer accent, but adds proper grayling dries and bugs, competition nymphs, caddis/olive work, terrestrials, pocket-water dries and alpine lake patterns.
18–22 · Pattern
Upstream dry, in the film
6–10 · Pattern
Swing, sub-surface
Permits & access
Permit required — see local rules.
- Italian fishing license (permesso di pesca) varies by provincia (province)
- Barbless hooks often required on protected waters
- Catch limits may apply.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
The Avisio river just south of Cavalese, Val di Fiemme Terrain map
About this water
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · ITARW02AD07200060TN
The full read · show the working · for Brown Trout · confidence 40%
How the 0 is built — score × weight = contribution
Temperature22 × 28%6.2
Flow55 × 22%12.1
Clarity15 × 18%2.7
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity13 × 12%1.6
Limiting factor: Water is very coloured — too coloured for Brown Trout= 35
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 2026-02-15 → 2026-10-07
- Marble trout 2026-03-01 → 2026-09-30
Related guides
Booking & contacts
Avisio
Flows through the Fiemme and Fassa valleys framed by beautiful alpine scenery.
Water temperature for Brown Trout
Cool — slow5°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the Italian trout season — afternoon hatches in spring; dawn and dusk in summer warm. Val di Fiemme and Val di Fassa fish high-elevation cold water.
Where
Pool tails, riffle heads, and the seams through the dolomite gorges. The Avisio runs cleaner pocket water than the glacial Sarca and Noce.
Method
Upstream nymph through the broken water; dry to risers in the glides. Italian No-Kill stretches mandate single barbless — comply or fish elsewhere.
Kit
9 to 10 ft #4 for medium freestone with Alpine clarity. Floating line, 12 ft leader to 4 to 5 lb fluoro. Studded boots — Alpine cobble runs slick.
Likely species
Hatch timeline · todayQuiet day
Low insect activity predicted today
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 3 guilds 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 · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Evening SedgeHatch
2
3
3
3
2
Alpine RhithrogenaHatch
1
2
2
1
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
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 fuller Italian trout and grayling box for the southern Alps and northern limestone/alpine systems. It keeps the marble-trout streamer accent, but adds proper grayling dries and bugs, competition nymphs, caddis/olive work, terrestrials, pocket-water dries and alpine lake patterns.
18–22 · Pattern
Upstream dry, in the film
6–10 · Pattern
Swing, sub-surface
Permits & access
Permit required — see local rules.
- Italian fishing license (permesso di pesca) varies by provincia (province)
- Barbless hooks often required on protected waters
- Catch limits may apply.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
The Avisio river just south of Cavalese, Val di Fiemme Terrain map
About this water
Brown trout and marble trout in the water, with some sections regulated by hydro releases. Good dry fly fishing during caddis hatches when the light is right.
- Mixed
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · ITARW02AD07200060TN
The full read · show the working · for Brown Trout · confidence 40%
How the 0 is built — score × weight = contribution
Temperature22 × 28%6.2
Flow55 × 22%12.1
Clarity15 × 18%2.7
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity13 × 12%1.6
Limiting factor: Water is very coloured — too coloured for Brown Trout= 35
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 2026-02-15 → 2026-10-07
- Marble trout 2026-03-01 → 2026-09-30
Related guides
Booking & contacts
At a glance
Avisio is a freestone river in Trentino-Alto Adige / Val di Fiemme, Italy. It sits at about 1,027 m above sea level. Species listed for this water: brown trout and marble trout. The trout season is recorded as running from 15 February to 7 October. The marble trout season is recorded as running from 1 March to 30 September. Best window recorded for anglers: Spring (March–May) and autumn (September–November). Core methods listed: Nymph; Dry fly; Streamer. Level and flow data for this water is linked from 1 gauge. Its Water Framework Directive ecological status is recorded as good. Nearby waters in our listings include Lake Levico at 32 km, Adige Tributaries (Trentino) at 33 km and Lake Caldonazzo at 33 km.