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.

Today · A proper day on the water
Coch-y-bonddu
Forecast · Today
A proper day on the water
A proper day for it. Work the seams with an upstream nymph, switch to the dry when they show.
55% projected
Today's fly
Coch-y-bonddu
Coch-y-bonddu
Conditions on the water · Today
Live gauge
Level
Steady
1.36 m
Water temp14.3°C
ClarityClear
Weather14°C
WindN 18 km/h
Pressure1031 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 Grayling
Warm — slow
14°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
Good — time of day is right today, though water temperature could be better.
Likely species
Mayflies
Caddisflies
Chironomids
Damselflies & dragonflies
Gammarids
Hatch timeline · todayPeak at 4pm

12pm(now) — Cinnamon Sedge

Stage: Taking dunsApproach: Dry flyActivity: 59%
Also:Pale Watery47%Black Gnat47%
11 food groups active

Peak activity at 4pm — Blue Winged Olive (Blue Winged Olive, 12 food groups active)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds as a supporter.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 5 as a supporter.

Start free trial

14-day free trial. Cancel anytime.

Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year
0–3 scale · September 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.

Small Perdigón
Small Perdigón
Hook 14–18 · Fly
in season · matches water height
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 · 1
Reda
54 km
65
Brown trout · Sea trout · Grayling
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 Grayling · confidence 75%
How the 72 is built — score × weight = contribution
Temperature45 × 28%12.6
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time90 × 13%11.7
Pressure80 × 7%5.6
Insect activity73 × 12%8.8
Conditions total= 72
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 4–14 °C ideal band — would lift the score and ease welfare.
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