Karst Spring · Limestone · Karlovac County / Risnjak NP, HR

Kupa (Risnjak National Park)

Kupa (Risnjak National Park) — IMG 20180713 163857(fixed)
Prime · Grayling
Pink Grayling Bug · Hook 16
Primelive now
About as good as it gets
River high but settled. Coloured water — fish bigger and deeper, confident takes down the seams.
90% confidence
What moved it
  • LevelProxyvia River Kolpa
  • Water temp12.5°C
  • ClarityClear
Today's fly
Pink Grayling Bug
Pink Grayling BugHook 16
in season · matches water height · all-rounder
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via River Kolpa
Water temp12.5°C
ClarityClear
Weather19°C
WindE 10 km/h
Pressure1027 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

No gauge on this water — conditions are inferred from River Kolpa. The trend transfers, the absolute level does not.

Water temperature for Grayling
Ideal
13°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 — conditions well-balanced, with water temperature particularly in your favour.
Likely species
Mayflies
Caddisflies
Damselflies & dragonflies
Gammarids
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 12 active hatches hour by hour as a supporter.

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Sub-surface · on the nymphunder the surface

Hatch predictions

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

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 4 as a supporter.

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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
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
Brown SedgeHatch
2
3
3
3
2
Small SpurwingHatch
2
3
3
3
2
Small Dark OliveHatch
2
3
3
3
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Fly box · Grayling
Small Perdigón
Small Perdigón
Hook 14–18 · Fly
in season · matches water height
Permits & access
Permit required — see local rules.
  • Croatian freshwater fishing licence required
  • Risnjak NP permit required for the source area
  • Check Croatian Angling Federation for beat permits.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Kupa (Upper / Risnjak NP)
9.0 km
Brown trout · Grayling · Hucho
Kupica
14 km
84
Brown trout · Grayling
Curak
16 km
Brown trout
River Kolpa
22 km
Brown trout · Grayling · Hucho
Bloško jezero
35 km
Carp · Pike
Gallery · 2
  1. Kupa (Risnjak National Park) — IMG 20180713 163857(fixed)
    IMG 20180713 163857(fixed)
  2. Terrain map of the venue
    Terrain map
The full read · show the working · for Grayling · confidence 90%
How the 87 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 activity71 × 12%8.5
Conditions total= 87
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via River Kolpaproxy
Prey activitymodelled from regional profilemodelled
Related guides
Hucho / Danube Salmonspecialist apex-predator guideGrayling Playbookgrayling tacticsEuro Nymphingsubsurface methods
Booking & contacts