Freestone · Karst · Una-Sana Canton / Bihać, BA

Una

The Una is one of the great fly fishing rivers of South-Eastern Europe — crystal-clear karst water flowing through tufa-dammed pools and cascades near Bihać and the Una National Park.

Una Gorge Kulen Vakuf

Julian Nyča - CC BY-SA

Closed season

Out of season. Try elsewhere.

Closed — confidence not applicable today.

Notify when prime

What moved it

LevelProxyvia Korana
Water temp13.2°C
ClarityClear

Today's fly

Pink Grayling BugHook 16

in season · matches water height · all-rounder

Rules at a glance

Permit required

Live now

Conditions on the water

Proxy gauge

Trends shown where the gauge supports them

Level

Steady

Proxy

via Korana

Water temp

13.2°C

coldwarm

Clarity

Clear

Weather

21°C

Clear

Wind

N 8 km/h

calmblown out

Pressure

1026 hPa

lowhigh

Rain · recent

0.0 mm

dryspate risk

Rain · ahead

0.0 mm

dryspate risk

No gauge on this water — conditions are inferred from Korana. 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.

Likely species

Mayflies

Angler's CurseMost likelyLower confidenceNearest relative
#20–22 · Spinner
Go tiny: 20-22 spent spinner, single fly, long tippet.

Stoneflies

Autumn Needle FlyMost likelyLower confidenceNearest relative
#16–18 · Adult
Small slender stonefly of clean, cold riffles in autumn.

Caddisflies

Green SedgeMost likelyLower confidenceNearest relative
#10–12–14–16 · Nymph
Free-living green caddis larva; fast stony riffles.
CapererAlso possibleLower confidence
#10–12 · Adult
Big autumn sedge; fish dry at last light.

Gammarids

Freshwater shrimpMost likelyLower confidenceNearest relative
#10–14 · Adult
No hatch? Dead-drift a shrimp deep — the year-round standby.

Hatch timeline · todayPeak at 3pm

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 3 guilds as a supporter.

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14-day free trial. Cancel anytime.

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

Trout season

Grayling season

March Brown

Late March Brown

Large Brook Dun

Large Stonefly

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

Ranked for today

Grayling fly box

Clear karst rivers with technical dry-fly and nymph fishing. Spring-fed systems like the Ribnik and Pliva demand fine tippets and careful presentation. The Una system adds grayling and huchen diversity.

Small Perdigón

Hook 14–18 · Fly

in season · matches water height

Permits & access

Permit required — see local rules.

Ribolovačka dozvola (fishing permit)
Permits for visiting anglers available from local fishing associations, tourist offices, and sometimes hotels
Enquire locally for the specific water.

What's coming

Plan ahead

5-day outlook

Other water nearby · 4

Gallery · 2

Una Gorge Kulen Vakuf
Terrain map

About this water

The Una is one of the great fly fishing rivers of South-Eastern Europe — crystal-clear karst water flowing through tufa-dammed pools and cascades near Bihać and the Una National Park. Brown trout, grayling, and huchen in water of extraordinary clarity. The tufa formations create unique habitat with slow glides above natural barriers and faster runs below. Dry fly, nymph, and streamer fishing across varied water types. C&R encouraged on premium beats.

Karst

The full read · show the working · for Grayling · confidence 90%

How the 0 is built — score × weight = contribution

Temperature100 × 28%28.0

Flow80 × 22%17.6

Clarity85 × 18%15.3

Feeding Time90 × 13%11.7

Pressure80 × 7%5.6

Insect activity77 × 12%9.2

Conditions total= 87

Can you trust it?

Water temperatureair-to-water estimateestimated

Level / flowproxy via Koranaproxy

Prey activitymodelled from regional profilemodelled

Directions

Apple Maps Google Maps

Seasons & zones

Trout 1 March → 30 September
Grayling 1 May → 30 September
Hucho 1 October → 28 February

Related guides

Booking & contacts

Freestone · Karst · Una-Sana Canton / Bihać, BA

Una

Contributor photo

Una Gorge Kulen Vakuf

Julian Nyča - CC BY-SA

The Una is one of the great fly fishing rivers of South-Eastern Europe — crystal-clear karst water flowing through tufa-dammed pools and cascades near Bihać and the Una National Park.

Poor · Grayling

Pink Grayling Bug · Hook 16

Closed season

Out of season. Try elsewhere.

Closed — confidence not applicable today.

Notify when prime

What moved it

LevelProxyvia Korana
Water temp13.2°C
ClarityClear

Today's fly

Pink Grayling BugHook 16

in season · matches water height · all-rounder

Conditions on the water

Proxy gauge

Level

Steady

Proxy

via Korana

Water temp13.2°C

ClarityClear

Weather21°C

WindN 8 km/h

Pressure1026 hPa

Rain · recent0.0 mm

Rain · ahead0.0 mm

No gauge on this water — conditions are inferred from Korana. 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.

Likely species

Mayflies

Angler's CurseMost likelyLower confidenceNearest relative
#20–22 · Spinner
Go tiny: 20-22 spent spinner, single fly, long tippet.

Stoneflies

Autumn Needle FlyMost likelyLower confidenceNearest relative
#16–18 · Adult
Small slender stonefly of clean, cold riffles in autumn.

Caddisflies

Green SedgeMost likelyLower confidenceNearest relative
#10–12–14–16 · Nymph
Free-living green caddis larva; fast stony riffles.
CapererAlso possibleLower confidence
#10–12 · Adult
Big autumn sedge; fish dry at last light.

Gammarids

Freshwater shrimpMost likelyLower confidenceNearest relative
#10–14 · Adult
No hatch? Dead-drift a shrimp deep — the year-round standby.

Hatch timeline · todayPeak at 3pm

Hatch predictions

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

Start free trial

14-day free trial. Cancel anytime.

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 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 4 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

Trout season

Grayling season

March Brown

Late March Brown

Large Brook Dun

Large Stonefly

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

Ranked for today

Grayling fly box

Small Perdigón

Hook 14–18 · Fly

in season · matches water height

Permits & access

Permit required — see local rules.

Ribolovačka dozvola (fishing permit)
Permits for visiting anglers available from local fishing associations, tourist offices, and sometimes hotels
Enquire locally for the specific water.

What's coming

Plan ahead

5-day outlook

Other water nearby · 4

Unac

35 km

Brown trout · Grayling

Gacka

50 km

Brown trout · Grayling

Korana

50 km