Limestone · Karst · Karlovačka, HR

Mrežnica

Photo of Mrežnica

Beautiful karst river with tufa barriers and waterfalls.

Prime · Brown Trout
Elk Hair Caddis · 12-16
Primelive now
About as good as it gets
River dropping into shape after a lift. The kind of afternoon you remember — a weighted nymph through the clearing seams, the dry as it settles.
90% confidence
What moved it
  • Level0.23 mDropping after lift
  • Water temp16.5°C
  • ClarityClear
Today's fly
Elk Hair Caddis
Elk Hair Caddis12-16
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.23 m
Dropping after lift
Water temp16.5°C
ClarityClear
Weather22°C
WindSW 3 km/h
Pressure1015 hPa
Rain · recent0.0 mm
Rain · ahead20.2 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
17°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
Excellent — water clarity is right today, though time of day could be better.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 12 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 3 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
2
1
Grayling seasonSeason
1
2
2
2
2
2
1
Brown SedgeHatch
2
3
2
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
Blue Winged OliveHatch
2
3
3
3
3
2
Mayfly (Green Drake)Hatch
2
2

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

Ranked for today
Brown Trout 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.

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
Brown trout · Grayling
Korana
16 km
Brown trout
Krupa
40 km
Brown trout
River Kolpa
46 km
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 Brown Trout · confidence 90%
How the 81 is built — score × weight = contribution
Temperature88 × 28%24.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity67 × 12%8.0
Conditions total= 81
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
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