Mayflies
Gammarids
Included by the Grayling Society among northern Polish grayling rivers—a river with consistent character.
- Mixed
Rules at a glance
- Licence required
Water temperature for Grayling
Ideal7°C est.ideal 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
Excellent — water temperature is right today, though insect activity could be better. Grayling feeds actively in cold water — peak winter sport.
Likely species
Hatch timeline · tomorrowQuiet day
12pm(now) — Black Midge
Stage: On emergersApproach: Emerger or dryActivity: 16%
Low insect activity predicted today
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 3 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 2 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Records-basedModerate confidence
Based on species-occurrence records, not local invertebrate surveys.
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
Terrestrial BeetlesHatch
2
3
3
2
Blue Winged OliveHatch
1
2
2
2
2
1
Black MidgeHatch
1
2
2
2
2
2
2
2
2
2
2
1
Summer River MidgeHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Grayling fly box
Southern Polish trout and grayling rivers led by the Dunajec model: nymphing by day, dry fly in the evening, streamer as support.
Hook 14–18 · Fly
in season
Permits & access
Permit required — see local rules.
- Polish fishing card plus local permit required
- Kashubian and coastal-river rules can vary by stretch, so check the exact local management area before planning around sea-trout possibilities.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
Gallery · 2
Radunia Terrain map
About this water
Water quality (WFD)
- Ecology: Moderate
- Chemical: Unknown
WFD classification · PLRW20001029845
The full read · show the working · for Grayling · confidence 75%
How the 84 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time95 × 13%12.4
Pressure80 × 7%5.6
Insect activity45 × 12%5.4
Conditions total= 84
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
Directions
Seasons & zones
- Trout 1 April → 30 September
- Grayling 1 June → 28 February
Polish PZW national rule: grayling (lipień) protected 1 March – 31 May. Open window 1 June – 28 February. PZW district and water-specific rules may add tighter restrictions. Carpathian rivers (San, Dunajec, Biała, Skawa, Raba) hold excellent grayling — check local Okręg PZW district permit for specific conditions.
Closed in spring for spawning.
Prime sport 1 September → 30 November
Sea trout: Variable seasonal (2026)
Related guides
Booking & contacts
Radunia
Kashubian river flowing from the lake district to the Baltic near Gdańsk, grayling, brown trout, and sea trout in clear water with gravel substrate.
Water temperature for Grayling
Ideal7°C est.ideal 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
Excellent — water temperature is right today, though insect activity could be better. Grayling feeds actively in cold water — peak winter sport.
Likely species
Hatch timeline · tomorrowQuiet day
12pm(now) — Black Midge
Stage: On emergersApproach: Emerger or dryActivity: 16%
Low insect activity predicted today
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 3 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 2 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Records-basedModerate confidence
Based on species-occurrence records, not local invertebrate surveys.
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
Terrestrial BeetlesHatch
2
3
3
2
Blue Winged OliveHatch
1
2
2
2
2
1
Black MidgeHatch
1
2
2
2
2
2
2
2
2
2
2
1
Summer River MidgeHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Grayling fly box
Southern Polish trout and grayling rivers led by the Dunajec model: nymphing by day, dry fly in the evening, streamer as support.
Hook 14–18 · Fly
in season
Permits & access
Permit required — see local rules.
- Polish fishing card plus local permit required
- Kashubian and coastal-river rules can vary by stretch, so check the exact local management area before planning around sea-trout possibilities.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
Gallery · 2
Radunia Terrain map
About this water
Included by the Grayling Society among northern Polish grayling rivers—a river with consistent character.
- Mixed
Water quality (WFD)
- Ecology: Moderate
- Chemical: Unknown
WFD classification · PLRW20001029845
The full read · show the working · for Grayling · confidence 75%
How the 84 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time95 × 13%12.4
Pressure80 × 7%5.6
Insect activity45 × 12%5.4
Conditions total= 84
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
Directions
Seasons & zones
- Trout 1 April → 30 September
- Grayling 1 June → 28 February
Polish PZW national rule: grayling (lipień) protected 1 March – 31 May. Open window 1 June – 28 February. PZW district and water-specific rules may add tighter restrictions. Carpathian rivers (San, Dunajec, Biała, Skawa, Raba) hold excellent grayling — check local Okręg PZW district permit for specific conditions.
Closed in spring for spawning.
Prime sport 1 September → 30 November
Sea trout: Variable seasonal (2026)
Related guides
Booking & contacts
At a glance
Radunia is a lowland river in Kashubia / Gdańsk, Poland. It sits at about 161 m above sea level. The river is described as roughly 103 km long. Our data lists brown trout, sea 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. Core methods listed: Nymph fishing; Dry fly; Small streamer. 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 Łeba at 41 km, Reda at 46 km and Łupawa at 52 km.