Limestone · Karst · Karlovačka, HR

Mrežnica

Photo of Mrežnica

Beautiful karst river with tufa barriers and waterfalls.

Today · About as good as it gets
Balloon Caddis
Forecast · Today
About as good as it gets
On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
55% projected
Today's fly
Balloon Caddis
Balloon Caddis
Conditions on the water · Today
Live gauge
Level
Falling
0.42 m
Dropping after lift
Water temp11.7°C
ClaritySlightly coloured
Weather15°C
WindN 7 km/h
Pressure1026 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
Ideal
12°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
Caddisflies
Damselflies & dragonflies
Gammarids
Hatch timeline · todayPeak at 6pm

12pm(now) — Autumn Olive

Stage: On emergersApproach: Emerger or dryActivity: 55%
Also:Brown Sedge47%Daddy Long Legs35%Autumn Needle Fly32%
Peak emergence window10 food groups active

Peak activity at 6pm — Large Cinnamon Sedge (Large Cinnamon Sedge, Weather boost)

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
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
1
2
2
2
2
2
1
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
Grayling fly box

Ultra-clear spring-fed rivers with large educated trout. Sight fishing, technical presentation, fine tippets. Euro-nymphing dominant subsurface method. Exceptional dry-fly windows during hatch periods. Gacka is the flagship water.

Small Perdigón
Small Perdigón
Hook 14–18 · Fly
in season · matches water height
Permits & access
Permit required — see local rules.
  • Croatian fishing licence + local permit.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Vitunjčica
11 km
Brown trout
Dobra
12 km
81
Brown trout · Grayling
Korana
16 km
Brown trout
Krupa
38 km
Brown trout
River Kolpa
46 km
79
Brown trout · Grayling · Hucho
Gallery · 2
  1. Photo of Mrežnica
    Mrežnica
  2. Terrain map of the venue
    Terrain map
About this water

Beautiful karst river with tufa barriers and waterfalls. Wild brown trout in clear pools between travertine cascades. The tufa character creates unique habitat — slow glides above barriers, faster runs below. An unusual and visually stunning fishery.

  • Karst
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown

WFD classification · HRCSRN0012_004

The full read · show the working · for Grayling · confidence 90%
How the 86 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity77 × 12%9.2
Conditions total= 86
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 March → 30 September
  • Grayling 16 May → 30 November

    Croatian rules: artificial fly or lure only in permanent grayling habitats. Check concession rules for the specific water.

    Prime sport 1 September → 30 November

    • 16 May → 30 Nov · Artificial fly or artificial lure
Related guides
Grayling Playbookgrayling tacticsEuro Nymphingsubsurface methods
Booking & contacts