Gammarids
Limestone mountain water with stocked rainbow beats managed at Cambil. Streamers, attractors, and nymphs work in managed river-pool habitat. Altitude trout at a quieter Sierra. Local permitting differs from Cazorla — confirm locally.
- Limestone
Rules at a glance
- Public water
- Licence required
Water temperature for Brown Trout
Cool — slow6°C est.ideal 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.
Likely species
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 3 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout 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
Brown Trout fly box
Permits & access
Permit required — see local rules.
- Junta de Andalucía licence plus trout surcharge required
- Guadalbullón rules can differ from the main Cazorla office system, so confirm the exact local coto and permit arrangements before travel.
What's coming
Plan ahead
5-day outlook
Gallery · 2
Terrain map
About this water
Water quality (WFD)
- Ecology: Moderate
- Chemical: Unknown
What this classification means
WFD ecological status Poor → Moderate corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody ES050MSPF011009019 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.
WFD classification · ES050MSPF011009019
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature33 × 28%9.2
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity24 × 12%2.9
Conditions total= 58
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout late March / early April → mid-August to mid-September
Related guides
Booking & contacts
Río Guadalbullón
A trout river in the lesser-known Sierra Mágina (outside the main Cazorla park).
Water temperature for Brown Trout
Cool — slow6°C est.ideal 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.
Likely species
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 3 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout 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
Brown Trout fly box
Permits & access
Permit required — see local rules.
- Junta de Andalucía licence plus trout surcharge required
- Guadalbullón rules can differ from the main Cazorla office system, so confirm the exact local coto and permit arrangements before travel.
What's coming
Plan ahead
5-day outlook
Gallery · 2
Terrain map
About this water
Limestone mountain water with stocked rainbow beats managed at Cambil. Streamers, attractors, and nymphs work in managed river-pool habitat. Altitude trout at a quieter Sierra. Local permitting differs from Cazorla — confirm locally.
- Limestone
Water quality (WFD)
- Ecology: Moderate
- Chemical: Unknown
What this classification means
WFD ecological status Poor → Moderate corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody ES050MSPF011009019 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.
WFD classification · ES050MSPF011009019
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature33 × 28%9.2
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity24 × 12%2.9
Conditions total= 58
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout late March / early April → mid-August to mid-September
Related guides
Booking & contacts
At a glance
Río Guadalbullón is a freestone river in Andalucía / Jaén (Sierra Mágina), Spain. Its recorded elevation is about 949 m above sea level and the catchment geology is limestone. The river is described as roughly 45 km long. Our data lists brown trout and rainbow trout here. Core methods listed: dry fly; nymph; careful low-water approach. Level and flow data for this water is linked from 4 gauges. Its Water Framework Directive ecological status is recorded as moderate.