Rules at a glance
- Free fishing
- Fly only
Water temperature for Marble Trout
Warm — slow22°C est.ideal 8–13°C
0°14°28°
How to fish it · for Marble Trout
When
Low light again — the Fella's marbles are cautious in a clear, flashy river. Season 29 March to 27 September; single barbless, minimum 35cm through the Moggio Udinese reach.
Where
Deeper glides and undercuts below Chiusaforte and through the Moggio Udinese stretch, where the river settles slightly before meeting the Tagliamento.
Method
Streamer fishing, intermediate or sink-tip, worked through the deeper holding water at first and last light.
Kit
9 to 10 ft #6/7, intermediate line, 8 to 10 lb fluoro. Wet net.
Why this works
Water at 22.4°C. This is the line where catch-and-release kills marble trout. Do not fish for them today.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 2 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalModerate confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August 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
Large StoneflyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Marble Trout fly box
Permits & access
Permit required — see local rules.
- ETPI regional licence required
- FVG Zone B season: trout open 07:00 on 29 March to 27 September, catch-and-release extension to 31 October
- Marble trout minimum size 35cm on this reach (Collegio 8 Pontebba), one fish a day, single barbless hook mandatory on No-Kill and RPS water
- The historic grayling population never recovered after the 1994 flood — not a realistic target here.
What's coming
Plan ahead
5-day outlook
Water here around 22°C. Nothing cooler within range — carry a thermometer.
The full read · show the working · for Marble Trout · confidence 90%
How the 10 is built — score × weight = contribution
Temperature8 × 28%2.2
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity65 × 12%7.8
Limiting factor: Water temperature (22.4°C) is outside Marble Trout's preferred range (8–13°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 8–13 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 2026-03-29 → 2026-09-27
- Marble trout 2026-03-29 → 2026-09-27
Related guides
Booking & contacts
Fella
Water temperature for Marble Trout
Warm — slow22°C est.ideal 8–13°C
0°14°28°
How to fish it · for Marble Trout
When
Low light again — the Fella's marbles are cautious in a clear, flashy river. Season 29 March to 27 September; single barbless, minimum 35cm through the Moggio Udinese reach.
Where
Deeper glides and undercuts below Chiusaforte and through the Moggio Udinese stretch, where the river settles slightly before meeting the Tagliamento.
Method
Streamer fishing, intermediate or sink-tip, worked through the deeper holding water at first and last light.
Kit
9 to 10 ft #6/7, intermediate line, 8 to 10 lb fluoro. Wet net.
Why this works
Water at 22.4°C. This is the line where catch-and-release kills marble trout. Do not fish for them today.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 2 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalModerate confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August 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
Large StoneflyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Marble Trout fly box
Permits & access
Permit required — see local rules.
- ETPI regional licence required
- FVG Zone B season: trout open 07:00 on 29 March to 27 September, catch-and-release extension to 31 October
- Marble trout minimum size 35cm on this reach (Collegio 8 Pontebba), one fish a day, single barbless hook mandatory on No-Kill and RPS water
- The historic grayling population never recovered after the 1994 flood — not a realistic target here.
What's coming
Plan ahead
5-day outlook
Water here around 22°C. Nothing cooler within range — carry a thermometer.
The full read · show the working · for Marble Trout · confidence 90%
How the 10 is built — score × weight = contribution
Temperature8 × 28%2.2
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity65 × 12%7.8
Limiting factor: Water temperature (22.4°C) is outside Marble Trout's preferred range (8–13°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 8–13 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 2026-03-29 → 2026-09-27
- Marble trout 2026-03-29 → 2026-09-27
Related guides
Booking & contacts