Freestone · Mixed · Central Bohemia, CZ

Vltava 28

Photo of Vltava 28

One of the best trout fisheries in the country — fly-fishing only, barbless hooks only, with elevated takeable size limits for grayling and brown trout stricter than the national baseline.

Good · Grayling
Pink Grayling Bug · Hook 16
Goodlive now
A proper day on the water
Low and clear — careful approach country. Stay small, stay accurate.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp15.1°C
  • ClarityClear
Today's fly
Pink Grayling Bug
Pink Grayling BugHook 16
in season · matches water height · all-rounder
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp15.1°C
ClarityClear
Weather18°C
WindSE 16 km/h
Pressure1025 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for Grayling
Warm — slow
15°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
Good — water clarity is right today, though water temperature could be better.
Likely species
Caddisflies
Gammarids
Hatch timeline · todayPeak at 2pm

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
Survey-backed · regionalModerate confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

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
1
Grayling seasonSeason
1
2
2
2
2
1
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1

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

Ranked for today
Grayling fly box

The most distinct national style here: Czech nymphing first, with short-line teams of 2 or 3 weighted nymphs central to trout and grayling fishing in fast rivers.

Small Perdigón
Small Perdigón
Hook 14–18 · Fly
in season · matches water height
Permits & access
Permit required — see local rules.
  • State licence (rybářský lístek) + local permit from ČRS branch
  • Fly-only, barbless hooks mandatory
  • Brown trout protected Sep 1–Apr 15
  • Grayling protected Dec 1–Jun 15.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Slapy Reservoir
9.0 km
Rainbow trout · Pike · Zander
Orlík Reservoir
21 km
Rainbow trout · Carp · Pike
Berounka
28 km
Chub · Barbel · Grayling
Blanice
59 km
30
Brown trout · Grayling
Otava 6 (Private Trophy Section)
60 km
Brown trout
Gallery · 2
  1. Photo of Vltava 28
    Vltava 28
  2. Terrain map of the venue
    Terrain map
About this water

One of the best trout fisheries in the country — fly-fishing only, barbless hooks only, with elevated takeable size limits for grayling and brown trout stricter than the national baseline. Brown trout, rainbow trout and grayling in water where Czech nymphing was developed and perfected. A showcase fishery with beat-specific management that sets the standard for Czech quality-section regulation. WFD ecological status is 'Bad', likely reflecting upstream pressures on the wider Vltava rather than the managed fishery itself — the fly-only beats remain highly productive.

  • Mixed
Water quality (WFD)
  • Ecology: Bad
The full read · show the working · for Grayling · confidence 90%
How the 68 is built — score × weight = contribution
Temperature54 × 28%15.1
Flow60 × 22%13.2
Clarity85 × 18%15.3
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity72 × 12%8.6
Conditions total= 68
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 4–14 °C ideal band — would lift the score and ease welfare.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Rainbow trout 16 April → 31 August
  • Trout 16 April → 31 August
  • Grayling 16 June → 30 November

    Czech national rule: grayling (lipan podhorní) protected 1 December – 15 June. Open window is 16 June – 30 November. Czech Anglers Union (ČRS) salmonid fisheries also have method and access rules — check the local ČRS district permit for specific conditions.

    Closed in spring for spawning.

    Prime sport 1 September → 30 November

Related guides
Grayling Playbookgrayling tacticsEuro Nymphingsubsurface methods
Booking & contacts