Mayflies
Stoneflies
Caddisflies
Damselflies & dragonflies
Gammarids
Limestone river flowing south from Trentino through the Val del Chiese with clear water that demands technical fishing. Marble trout, brown trout, and grayling present. Dam-regulated sections shape the flow pattern.
- Limestone
Rules at a glance
- Licence required
Water temperature for Grayling
Ideal8°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Autumn into late autumn — September through November is prime. Check the FIPSAS regional permit for current grayling season dates.
Where
Faster gravel runs in the middle and lower river. Deeper glide tails as autumn cold pushes fish deeper.
Method
Euro-nymphing primary — Perdigons and small dropper nymphs through the pocket water. Switch to dries when sedges or olives come off in autumn afternoons.
Kit
10 ft #3 nymphing rod, 4 to 5 lb fluoro tippet; 9 ft #4 for dries. 12 ft leader. Studded boots.
Why this works
Excellent — water temperature is working for you, but time of day is the limiting factor today. Grayling is active in the cooler margins of the season.
Likely species
Caddisflies
Damselflies & dragonflies
Hatch timeline · todayPeak at 11am
12pm(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 93%
Also:Black Midge49%Autumn Olive28%
Peak emergence window6 food groups active
Peak activity at 11am — Autumn Needle Fly (Autumn Needle Fly, Peak emergence window)
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
Supporters see what else is on the menu.
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
Grayling 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.
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
Terrain map
About this water
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · IT22E200000000090TN
The full read · show the working · for Grayling · confidence 55%
How the 80 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time15 × 13%2.0
Pressure80 × 7%5.6
Insect activity53 × 12%6.4
Conditions total= 75
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
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 Chiese/Val del Chiese 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
Chiese
Limestone river flowing south from Trentino through the Val del Chiese with clear water that demands technical fishing.
Water temperature for Grayling
Ideal8°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Autumn into late autumn — September through November is prime. Check the FIPSAS regional permit for current grayling season dates.
Where
Faster gravel runs in the middle and lower river. Deeper glide tails as autumn cold pushes fish deeper.
Method
Euro-nymphing primary — Perdigons and small dropper nymphs through the pocket water. Switch to dries when sedges or olives come off in autumn afternoons.
Kit
10 ft #3 nymphing rod, 4 to 5 lb fluoro tippet; 9 ft #4 for dries. 12 ft leader. Studded boots.
Why this works
Excellent — water temperature is working for you, but time of day is the limiting factor today. Grayling is active in the cooler margins of the season.
Likely species
Caddisflies
Damselflies & dragonflies
Hatch timeline · todayPeak at 11am
12pm(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 93%
Also:Black Midge49%Autumn Olive28%
Peak emergence window6 food groups active
Peak activity at 11am — Autumn Needle Fly (Autumn Needle Fly, Peak emergence window)
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
Supporters see what else is on the menu.
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
Grayling 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.
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
Terrain map
About this water
Limestone river flowing south from Trentino through the Val del Chiese with clear water that demands technical fishing. Marble trout, brown trout, and grayling present. Dam-regulated sections shape the flow pattern.
- Limestone
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · IT22E200000000090TN
The full read · show the working · for Grayling · confidence 55%
How the 80 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time15 × 13%2.0
Pressure80 × 7%5.6
Insect activity53 × 12%6.4
Conditions total= 75
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
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 Chiese/Val del Chiese 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