Chalk Stream · Limestone · Notranjska / Vrhnika

Bistra

Bistra — Bistra river - aerial
Good · Grayling
F-fly · sizes_14_18
Goodlive now
A proper day on the water
River lifting fast on the rain. Take your time — read the water before you cast.
60% confidence
What moved it
  • Level93.00 mLifting fast
  • Water temp13.3°C
  • ClarityVery colouredColouring up
Today's fly
F-fly
F-flysizes_14_18
off-peak month · matches water height · regional default
Conditions on the water
Live gauge
Level
Rising
93.00 m
Lifting fast
Water temp13.3°C
ClarityVery coloured
Weather28°C
WindE 13 km/h
Pressure1020 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

Live readings only. Trends shown where the gauge supports them.

Water temperature for Grayling
Ideal
13.3°Cideal 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 — water temperature is working for you, but river flow is the limiting factor today.
Likely species
Mayflies
  • Iron BlueMost likely
    #16–18 · Dun
    Cold, grey day — the dun sits long. Good dry-fly water.
  • Large dark oliveAlso possible
    #14–16 · Emerger
    Dead-drift the emerger — it's sitting in the film.
  • Anglers curse mayfliesAlso possibleLower confidence
    #20–22 · Spinner
    Go tiny: 20-22 spent spinner, single fly, long tippet.
  • Blue-winged oliveAlso possible
    #16–18 · Dun
    Duns are up; a sherry spinner fall may follow.
Caddisflies
  • Satin sedgeMost likelyLower confidence
    #12–14 · Egg-laying
    Skitter it at dusk — this one's fished, not dead-drifted.
  • GrannomAlso possible
    #14–16 · Pupa
    Pupa first, then dries as the adults come off.
  • Net-spinning caddis (S. Europe)Also possibleLower confidence
    #12–14–16 · Pupa
    Widespread riffle net-spinner; evening emergence.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 4 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 4 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

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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
Grayling fly box
Permits & access
Permit required — see local rules.
  • RD Vrhnika — separately permitted from the Ljubljanica.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Ljubija
4.0 km
85
Brown trout · Grayling · Rainbow trout
Ljubljanica
5.0 km
Hucho · Grayling · Brown trout
Iška
10 km
Brown trout · Grayling
Gradaščica
11 km
0
Brown trout · Grayling · Hucho
Unica
17 km
Brown trout
Gallery · 2
  1. Bistra — Bistra river - aerial
    Bistra river - aerial
  2. Terrain map of the venue
    Terrain map
The full read · show the working · for Grayling · confidence 60%
How the 65 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow30 × 22%6.6
Clarity45 × 18%8.1
Feeding Time95 × 13%12.4
Pressure80 × 7%5.6
Insect activity37 × 12%4.4
Conditions total= 65
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
A drop and clear would lift the flow and clarity scores.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 March → 30 September
  • Grayling 16 May → 30 November

    Slovenian common default: grayling 16 May – 30 November (lipan). Permit and fishing district controlled — dates may vary by specific water.

    Prime sport 1 September → 30 November

  • Hucho 31 October → 15 February
Related guides
Hucho / Danube Salmonspecialist apex-predator guideChalkstream Playbookchalk stream tacticsGrayling Playbookgrayling tactics
Booking & contacts