Spate · Granite · South Bohemia / Šumava

Vydra / Křemelná

Vydra venue image
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Wild mountain streams in the heart of the Šumava National Park, brown trout in pristine boulder-strewn water.

Marginal · Brown Trout
Czech Nymph · 10-14
Marginallive now
Slow going — pick your moments
River dropping into shape after a lift. A short window. Take your time.
80% confidence
What moved it
  • Level0.54 mDropping after lift
  • Water temp18.5°C
  • ClarityClearingClearing
Today’s fly
Czech Nymph
Czech Nymph10-14
Euro-nymph
Conditions on the water
Live gauge
Level
Steady
0.54 m
lowspate
Water temp18.5°C
ClarityClearing
Weather16°C
WindSW 4 km/h
Pressure1017 hPa
Rain · recent12.7 mm
Rain · ahead25.1 mm

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

Water temperature for brown trout
Warm — slow
18.5°Cideal 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
⚠️ Water at 18.5°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots. Otherwise poor — barometric pressure is in the right range.
Hatch timeline · todayQuiet day

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 · July 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
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2

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

Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • State licence + local permit.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 2
Water here at 18.5°C — the fishing's alive, but these are cooler if you'd rather rest the warm water.
Upper Vltava (Šumava)
22 km
~17°C
Brown trout · Grayling
Teplá Vltava (Upper Vltava / Warm Vltava)
22 km
~18°C
Brown trout · Grayling
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

Wild mountain streams in the heart of the Šumava National Park, brown trout in pristine boulder-strewn water. Some sections in the national park core zone are catch-and-release or closed. Intimate pocket water fishing where solitude and clarity matter as much as the fish.

  • Granite
The full read · show the working · for brown trout · confidence 80%
How the 37 is built — score × weight = contribution
Temperature47 × 28%13.2
Flow60 × 22%13.2
Clarity75 × 18%13.5
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity19 × 12%2.3
Conditions total= 53
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout16 April → 31 August
  • Grayling16 June → 30 November
Related guides
Euro Nymphingsubsurface methods
Booking & contacts