Lowland · Mixed · Kashubia / Gdańsk, PL

Radunia

Photo of 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.

Marginal · Brown Trout
Parachute Adams · 14-18
Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
80% confidence
What moved it
  • Level181.00 mDropping in the last 6h
  • Water temp19.6°C
  • ClarityVery colouredColouring up
Today's fly
Parachute Adams
Parachute Adams14-18
Upstream dry
Conditions on the water
Live gauge
Level
Rising
181.00 m
Dropping in the last 6h
Water temp19.6°C
ClarityVery coloured
Weather19°C
WindNW 13 km/h
Pressure1012 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Brown Trout
Warm — slow
20°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Water at 19.6°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Likely species
Mayflies
  • Blue-winged oliveMost likely
    #16–18 · Dun
    Duns are up; a sherry spinner fall may follow.
  • Anglers curse mayfliesAlso possibleLower confidence
    #20–22 · Spinner
    Go tiny: 20-22 spent spinner, single fly, long tippet.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 9 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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Evidence
ModelledModerate confidence

Modelled from regional ecology — no survey or occurrence data for this water yet.

Through the year
0–3 scale · August 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
Brown Trout fly box

Southern Polish trout and grayling rivers led by the Dunajec model: nymphing by day, dry fly in the evening, streamer as support.

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
Water here around 20°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Photo of Radunia
    Radunia
  2. Terrain map of the venue
    Terrain map
About this water

Kashubian river flowing from the lake district to the Baltic near Gdańsk, grayling, brown trout, and sea trout in clear water with gravel substrate. 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 Brown Trout · confidence 80%
How the 30 is built — score × weight = contribution
Temperature30 × 28%8.4
Flow30 × 22%6.6
Clarity15 × 18%2.7
Feeding Time50 × 13%6.5
Pressure80 × 7%5.6
Insect activity53 × 12%6.4
Limiting factor: Water is very coloured — too coloured for Brown Trout= 36
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
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
Grayling Playbookgrayling tacticsEuro Nymphingsubsurface methods
Booking & contacts