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.

Poor · Rainbow Trout
Czech Nymph · 10-14
Poorlive now
Not the day for it
Low and clear — careful approach country. A morning for the obvious fish only.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp22.4°C
  • ClarityClear
Today's fly
Czech Nymph
Czech Nymph10-14
Euro-nymph
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp22.4°C
ClarityClear
Weather26°C
WindS 6 km/h
Pressure1016 hPa
Rain · recent0.0 mm
Rain · ahead8.2 mm

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

Water temperature for Rainbow Trout
Warm — slow
22°C est.ideal 10–18°C
0°14°28°
How to fish it · for Rainbow 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
Water at 22.4°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 2 active hatches hour by hour with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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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 · August 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
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
1

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

Ranked for today
Rainbow Trout 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.

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
Cooler water nearby · 2
Probably above the Rainbow Trout safety line — these are likely cooler, but carry a thermometer.
Otava 6 (Private Trophy Section)
60 km
~22°C
Brown trout
Slapy Reservoir
9.0 km
~22°C
Rainbow trout · Pike · Zander
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 Rainbow Trout · confidence 90%
How the 14 is built — score × weight = contribution
Temperature7 × 28%2.0
Flow60 × 22%13.2
Clarity85 × 18%15.3
Feeding Time75 × 13%9.8
Pressure75 × 7%5.3
Insect activity47 × 12%5.6
Limiting factor: Water temperature (22.4°C) is outside Rainbow Trout's preferred range (10–18°C)= 51
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 10–18 °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