Water temperature for Marble Trout
Warm — slow23°C est.ideal 8–13°C
0°14°28°
How to fish it · for Marble Trout
When
Low light, always. Dawn and last light bring marbles up out of the deep glides near Merano; the rest of the day they sulk somewhere a fly rod can't usefully reach.
Where
The lower river's deeper pools and undercut banks, generally within a couple of kilometres of the Adige confluence. They don't so much share the water with brown trout as take the best of it.
Method
Streamer on an intermediate line, worked slowly and deliberately through the deep water. Single barbless hook, and if you're fortunate enough to hook one, land it quickly and keep it in the net.
Kit
9 to 10 ft #6/7, intermediate line, 8-10 lb fluoro, big baitfish patterns. Wet net for handling.
Why this works
Water at 23°C. This is the line where catch-and-release kills marble trout. Do not fish for them today.
Hatch timeline · todayPeak at 6pm
Hatch predictions
See the full hour-by-hour hatch timeline 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.
Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Alpine RhithrogenaHatch
1
2
2
1
Large Dark OliveHatch
1
2
2
1
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.
- Marble trout carry a year-round no-take rule (reservoirs excepted); brown trout have a 25cm minimum size and a 1 Dec-second Saturday of Feb closed season; grayling a 33cm minimum and a 1 Jan-31 May closed season
- Individual concession-holders can extend or tighten these rules for their own stretch.
What's coming
Plan ahead
5-day outlook
Water here around 23°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
Temperature5 × 28%1.4
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time65 × 13%8.5
Pressure80 × 7%5.6
Insect activity46 × 12%5.5
Limiting factor: Water temperature (23°C) is outside Marble Trout's preferred range (8–13°C)= 51
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
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 2026-02-15 → 2026-11-30
- Grayling 2026-06-01 → 2026-11-30
Rules are set at province or association level — check locally.
- Marble trout 2026-02-15 → 2026-11-30
Related guides
Booking & contacts
Passirio
Water temperature for Marble Trout
Warm — slow23°C est.ideal 8–13°C
0°14°28°
How to fish it · for Marble Trout
When
Low light, always. Dawn and last light bring marbles up out of the deep glides near Merano; the rest of the day they sulk somewhere a fly rod can't usefully reach.
Where
The lower river's deeper pools and undercut banks, generally within a couple of kilometres of the Adige confluence. They don't so much share the water with brown trout as take the best of it.
Method
Streamer on an intermediate line, worked slowly and deliberately through the deep water. Single barbless hook, and if you're fortunate enough to hook one, land it quickly and keep it in the net.
Kit
9 to 10 ft #6/7, intermediate line, 8-10 lb fluoro, big baitfish patterns. Wet net for handling.
Why this works
Water at 23°C. This is the line where catch-and-release kills marble trout. Do not fish for them today.
Hatch timeline · todayPeak at 6pm
Hatch predictions
See the full hour-by-hour hatch timeline 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.
Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Alpine RhithrogenaHatch
1
2
2
1
Large Dark OliveHatch
1
2
2
1
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.
- Marble trout carry a year-round no-take rule (reservoirs excepted); brown trout have a 25cm minimum size and a 1 Dec-second Saturday of Feb closed season; grayling a 33cm minimum and a 1 Jan-31 May closed season
- Individual concession-holders can extend or tighten these rules for their own stretch.
What's coming
Plan ahead
5-day outlook
Water here around 23°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
Temperature5 × 28%1.4
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time65 × 13%8.5
Pressure80 × 7%5.6
Insect activity46 × 12%5.5
Limiting factor: Water temperature (23°C) is outside Marble Trout's preferred range (8–13°C)= 51
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
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 2026-02-15 → 2026-11-30
- Grayling 2026-06-01 → 2026-11-30
Rules are set at province or association level — check locally.
- Marble trout 2026-02-15 → 2026-11-30
Related guides
Booking & contacts