Mayflies
Stoneflies
Pölten to the Danube, part of the classic Austrian trout-grayling zone. Brown trout and grayling in the upper sections. Included provisionally—stronger river-specific sourcing would help confirm grayling populations and seasonal patterns.
- Limestone
Rules at a glance
- Permit required
Water temperature for Grayling
Ideal7.3°Cideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Good — water temperature is working for you, but time of day is the limiting factor today. Grayling feeds actively in cold water — peak winter sport.
Likely species
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 4 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 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
Trout seasonSeason
1
2
2
2
2
1
Grayling seasonSeason
2
1
1
2
2
2
2
2
2
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
Grayling fly box
A classic alpine trout and grayling box. Nymphs, dry flies and streamers all belong, with the season often starting later in alpine regions.
Hook 14–18 · Fly
in season
Permits & access
Permit required — see local rules.
- Upper Traisen around Lilienfeld (Lower Austria)
- A Lower Austrian fishing card or guest fishing card is required, plus a permit for the specific stretch.
What's coming
Plan ahead
5-day outlook
Other water nearby · 2
Gallery · 2
Terrain map
About this water
Water quality (WFD)
- Ecology: Moderate
- Chemical: Failing to achieve good
What this classification means
WFD re-coded 2026-09-14 after the pin audit: matched by point query against EEA WISE WFD2022_SurfaceWaterBody (the river water body whose line lies 1 m from the venue pin). Status: WISE 2022 (3rd RBMP) ecological class 3 = Moderate, chemical 'failing to achieve good' (Austria-wide in the 2022 cycle). Prior id ATOK408380001 (Moderate) described a different reach.
WFD classification · ATOK409340005
The full read · show the working · for Grayling · confidence 75%
How the 77 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity41 × 12%4.9
Conditions total= 77
Can you trust it?
Water temperaturelive gauge readinggauge
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 1 April → 30 September
- Grayling 1 June → 28 February
Austrian grayling (Äsche) rules are state and fishery specific. Common pattern: closed 1 January – 31 May (spawning protection); open from June. Individual fishery seasons often end October/November. Always check the local Fischereikarte and specific water permit. Salzburg-area waters commonly show 1 June or 16 May opener.
Season dates are set at state or regional level — confirm the local rules.
Prime sport 1 August → 31 October
Related guides
Booking & contacts
Traisen
Lower Austrian alpine river flowing from limestone foothills through St.
Water temperature for Grayling
Ideal7.3°Cideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Good — water temperature is working for you, but time of day is the limiting factor today. Grayling feeds actively in cold water — peak winter sport.
Likely species
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 4 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 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
Trout seasonSeason
1
2
2
2
2
1
Grayling seasonSeason
2
1
1
2
2
2
2
2
2
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
Grayling fly box
A classic alpine trout and grayling box. Nymphs, dry flies and streamers all belong, with the season often starting later in alpine regions.
Hook 14–18 · Fly
in season
Permits & access
Permit required — see local rules.
- Upper Traisen around Lilienfeld (Lower Austria)
- A Lower Austrian fishing card or guest fishing card is required, plus a permit for the specific stretch.
What's coming
Plan ahead
5-day outlook
Other water nearby · 2
Gallery · 2
Terrain map
About this water
Pölten to the Danube, part of the classic Austrian trout-grayling zone. Brown trout and grayling in the upper sections. Included provisionally—stronger river-specific sourcing would help confirm grayling populations and seasonal patterns.
- Limestone
Water quality (WFD)
- Ecology: Moderate
- Chemical: Failing to achieve good
What this classification means
WFD re-coded 2026-09-14 after the pin audit: matched by point query against EEA WISE WFD2022_SurfaceWaterBody (the river water body whose line lies 1 m from the venue pin). Status: WISE 2022 (3rd RBMP) ecological class 3 = Moderate, chemical 'failing to achieve good' (Austria-wide in the 2022 cycle). Prior id ATOK408380001 (Moderate) described a different reach.
WFD classification · ATOK409340005
The full read · show the working · for Grayling · confidence 75%
How the 77 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity41 × 12%4.9
Conditions total= 77
Can you trust it?
Water temperaturelive gauge readinggauge
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 1 April → 30 September
- Grayling 1 June → 28 February
Austrian grayling (Äsche) rules are state and fishery specific. Common pattern: closed 1 January – 31 May (spawning protection); open from June. Individual fishery seasons often end October/November. Always check the local Fischereikarte and specific water permit. Salzburg-area waters commonly show 1 June or 16 May opener.
Season dates are set at state or regional level — confirm the local rules.
Prime sport 1 August → 31 October
Related guides
Booking & contacts
At a glance
Traisen is a freestone river in Lower Austria / St. Pölten. Its recorded elevation is about 372 m above sea level and the catchment geology is limestone. The river is described as roughly 80 km long. Our data lists brown trout and grayling here. The trout season is recorded as running from 1 April to 30 September. The grayling season is recorded as running from 1 June to 28 February. Best window recorded for anglers: April–September. Core methods listed: nymph; dry fly. Level and flow data for this water is linked from 2 gauges. Its Water Framework Directive ecological status is recorded as moderate. Nearby waters in our listings include Salza at 55 km and Ybbs at 60 km.