Mayflies
Stoneflies
Caddisflies
Damselflies & dragonflies
Gammarids
Valsugana river wider than many Trentino streams, offering mixed runs, pools and riffles where brown trout and marble trout hold. Good fly water when levels settle. Grayling in some sections too—a river of varied character.
- Limestone
Rules at a glance
- Licence required
Water temperature for Brown Trout
Ideal12°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; sedges through summer; small dark flies into autumn. Valsugana fishes lower elevation than the upper Trentino rivers.
Where
Pool tails and the deeper edges of pockets through the Valsugana stretches. The Brenta widens through the lower valley into longer glides.
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.
Why this works
Excellent — conditions well-balanced, with water temperature particularly in your favour.
Likely species
Caddisflies
- Green SedgeMost likelyLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
- Net-spinning caddisAlso possibleLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- CapererAlso possibleLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
Damselflies & dragonflies
Hatch timeline · todayPeak at 4pm
12pm(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 72%
Also:Autumn Olive57%Reed Smut57%
Peak emergence window11 food groups active
Peak activity at 4pm — Blue Winged Olive (Blue Winged Olive, 12 food groups active)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 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
Alpine RhithrogenaHatch
2
3
3
2
Sculpin / Baitfish (Rivers)Hatch
2
3
3
3
3
3
3
3
2
March BrownHatch
2
3
2
Late March BrownHatch
2
3
2
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
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 Brenta river flowing through Borgo Valsugana Terrain map
About this water
Water quality (WFD)
- Ecology: Moderate
- Chemical: Unknown
WFD classification · ITARW03BB13600020TN
The full read · show the working · for Brown Trout · confidence 90%
How the 87 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity77 × 12%9.2
Conditions total= 87
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Trout 2026-02-15 → 2026-10-07
- Grayling varies_by_water → varies_by_water
Italian Alpine grayling (temolo) — season varies by zona and managed by Trentino associations. Many grayling sections are no-retention or have strict seasonal restrictions. Check with local association or pescatrentino.it for specific Brenta/Valsugana section rules before fishing.
Rules are set at province or association level — check locally.
- Marble trout 2026-03-01 → 2026-09-30
Related guides
Booking & contacts
Brenta (Trentino)
Valsugana river wider than many Trentino streams, offering mixed runs, pools and riffles where brown trout and marble trout hold.
Water temperature for Brown Trout
Ideal12°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; sedges through summer; small dark flies into autumn. Valsugana fishes lower elevation than the upper Trentino rivers.
Where
Pool tails and the deeper edges of pockets through the Valsugana stretches. The Brenta widens through the lower valley into longer glides.
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.
Why this works
Excellent — conditions well-balanced, with water temperature particularly in your favour.
Likely species
Caddisflies
- Green SedgeMost likelyLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
- Net-spinning caddisAlso possibleLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- CapererAlso possibleLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
Damselflies & dragonflies
Hatch timeline · todayPeak at 4pm
12pm(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 72%
Also:Autumn Olive57%Reed Smut57%
Peak emergence window11 food groups active
Peak activity at 4pm — Blue Winged Olive (Blue Winged Olive, 12 food groups active)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 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
Alpine RhithrogenaHatch
2
3
3
2
Sculpin / Baitfish (Rivers)Hatch
2
3
3
3
3
3
3
3
2
March BrownHatch
2
3
2
Late March BrownHatch
2
3
2
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
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 Brenta river flowing through Borgo Valsugana Terrain map
About this water
Valsugana river wider than many Trentino streams, offering mixed runs, pools and riffles where brown trout and marble trout hold. Good fly water when levels settle. Grayling in some sections too—a river of varied character.
- Limestone
Water quality (WFD)
- Ecology: Moderate
- Chemical: Unknown
WFD classification · ITARW03BB13600020TN
The full read · show the working · for Brown Trout · confidence 90%
How the 87 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity77 × 12%9.2
Conditions total= 87
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Trout 2026-02-15 → 2026-10-07
- Grayling varies_by_water → varies_by_water
Italian Alpine grayling (temolo) — season varies by zona and managed by Trentino associations. Many grayling sections are no-retention or have strict seasonal restrictions. Check with local association or pescatrentino.it for specific Brenta/Valsugana section rules before fishing.
Rules are set at province or association level — check locally.
- Marble trout 2026-03-01 → 2026-09-30
Related guides
Booking & contacts