Mayflies
Stoneflies
Caddisflies
Aquatic beetles
Gammarids
A coarse fishery (barbel, carp, black bass in places), not trout water. Included for gauge/flow monitoring completeness on the Júcar main stem.
- Alluvial
Rules at a glance
- Public water
- Licence required
Water temperature for Barbel
Cool — slow10°C est.ideal 16–24°C
0°14°28°
How to fish it · for Barbel
When
Spring and autumn
Where
The Júcar's lower plain reach as it approaches the Mediterranean below the Tous reservoir — warm, slow, alluvial water running through Valencia's rice-growing…
Why this works
Fair — water clarity is working for you, but water temperature is the limiting factor today.
Likely species
Mayflies
- Large dark oliveMost likely#14–16 · EmergerDead-drift the emerger — it's sitting in the film.
- Angler's CurseAlso possibleLower confidenceNearest relative#20–22 · SpinnerGo tiny: 20-22 spent spinner, single fly, long tippet.
- Turkey BrownAlso possibleLower confidence#14–16 · DunSmall spring dun on slower glides and margins.
- Late March BrownAlso possibleLower confidence#12–14 · DunLate-season upland riffle dun, dusk emergence.
Caddisflies
- Saddle-case CaddisMost likelyLower confidenceNearest relative#16–18 · AdultTiny blackish caddis; fast riffles, early summer.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
- GrannomAlso possibleNearest relative#14–16 · PupaPupa first, then dries as the adults come off.
- Welshman's ButtonAlso possibleLower confidence#12–14 · Egg-layingSkitter it at dusk — this one's fished, not dead-drifted.
Aquatic beetles
- Diving beetlesMost likelyLower confidence#8–10–12 · AdultTwitch a beetle pattern along weedy edges at dusk.
Molluscs
- Pond snailsMost likelyLower confidence#10–12–14 · AdultDead-drift or twitch a snail pattern near weed beds.
Oligochaetes
- Aquatic wormsMost likelyLower confidence#12–14–16 · AdultDead-drift a worm pattern deep - a year-round staple.
Hatch timeline · todayPeak at 12pm
12pm(now) — Autumn Olive
Stage: On emergersApproach: Emerger or dryActivity: 28%
Also:Black Midge23%
Peak emergence window3 food groups active
Peak activity at 12pm — Autumn Olive (Autumn Olive, Peak emergence window)
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.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 2 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 · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Blue Winged OliveHatch
1
2
2
2
2
1
Black MidgeHatch
1
2
2
2
2
2
2
2
2
2
2
1
Summer River MidgeHatch
1
2
2
2
1
CaenisHatch
1
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Barbel fly box
Cooling water through September–November drives barbel into deeper, steadier runs and the slower glides below gravel riffles. Feeding activity remains high as fish build reserves before winter. Larger nymph profiles and crayfish patterns work better in autumn than the small-nymph summer approach. Cover more water — barbel move more actively in autumn, patrolling runs rather than sitting static. After heavy rain the Squirmy Worm and San Juan Worm become the standout options as invertebrates drift in coloured water.
Hook 6–10 · Fly
Barbel are significant predators of signal crayfish (Pacifastacus leniusculus) in English rivers, and invasive crayfish are present across much of Europe.
Permits & access
Permit required — see local rules.
- Comunidad Valenciana fishing licence required
- Not a trout water — check current Comunidad Valenciana coarse-fishing rules for the specific stretch.
What's coming
Plan ahead
5-day outlook
Other water nearby · 2
About this water
The full read · show the working · for Barbel · confidence 75%
How the 42 is built — score × weight = contribution
Temperature21 × 28%5.9
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time40 × 13%5.2
Pressure75 × 7%5.3
Insect activity50 × 12%6.0
Limiting factor: Water temperature (9.5°C) is outside Barbel's preferred range (16–24°C)= 55
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 16–24 °C ideal band — would lift the temperature score.
The dawn and dusk windows score higher than the midday lull.
Directions
Related guides
Booking & contacts
Río Júcar (Tramo Bajo — Valencia)
The Júcar's lower plain reach as it approaches the Mediterranean below the Tous reservoir — warm, slow, alluvial water running through Valencia's rice-growing lowlands.
Water temperature for Barbel
Cool — slow10°C est.ideal 16–24°C
0°14°28°
How to fish it · for Barbel
When
Spring and autumn
Where
The Júcar's lower plain reach as it approaches the Mediterranean below the Tous reservoir — warm, slow, alluvial water running through Valencia's rice-growing…
Why this works
Fair — water clarity is working for you, but water temperature is the limiting factor today.
Likely species
Mayflies
- Large dark oliveMost likely#14–16 · EmergerDead-drift the emerger — it's sitting in the film.
- Angler's CurseAlso possibleLower confidenceNearest relative#20–22 · SpinnerGo tiny: 20-22 spent spinner, single fly, long tippet.
- Turkey BrownAlso possibleLower confidence#14–16 · DunSmall spring dun on slower glides and margins.
- Late March BrownAlso possibleLower confidence#12–14 · DunLate-season upland riffle dun, dusk emergence.
Caddisflies
- Saddle-case CaddisMost likelyLower confidenceNearest relative#16–18 · AdultTiny blackish caddis; fast riffles, early summer.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
- GrannomAlso possibleNearest relative#14–16 · PupaPupa first, then dries as the adults come off.
- Welshman's ButtonAlso possibleLower confidence#12–14 · Egg-layingSkitter it at dusk — this one's fished, not dead-drifted.
Aquatic beetles
- Diving beetlesMost likelyLower confidence#8–10–12 · AdultTwitch a beetle pattern along weedy edges at dusk.
Molluscs
- Pond snailsMost likelyLower confidence#10–12–14 · AdultDead-drift or twitch a snail pattern near weed beds.
Oligochaetes
- Aquatic wormsMost likelyLower confidence#12–14–16 · AdultDead-drift a worm pattern deep - a year-round staple.
Hatch timeline · todayPeak at 12pm
12pm(now) — Autumn Olive
Stage: On emergersApproach: Emerger or dryActivity: 28%
Also:Black Midge23%
Peak emergence window3 food groups active
Peak activity at 12pm — Autumn Olive (Autumn Olive, Peak emergence window)
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.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 2 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 · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Blue Winged OliveHatch
1
2
2
2
2
1
Black MidgeHatch
1
2
2
2
2
2
2
2
2
2
2
1
Summer River MidgeHatch
1
2
2
2
1
CaenisHatch
1
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Barbel fly box
Cooling water through September–November drives barbel into deeper, steadier runs and the slower glides below gravel riffles. Feeding activity remains high as fish build reserves before winter. Larger nymph profiles and crayfish patterns work better in autumn than the small-nymph summer approach. Cover more water — barbel move more actively in autumn, patrolling runs rather than sitting static. After heavy rain the Squirmy Worm and San Juan Worm become the standout options as invertebrates drift in coloured water.
Hook 6–10 · Fly
Barbel are significant predators of signal crayfish (Pacifastacus leniusculus) in English rivers, and invasive crayfish are present across much of Europe.
Permits & access
Permit required — see local rules.
- Comunidad Valenciana fishing licence required
- Not a trout water — check current Comunidad Valenciana coarse-fishing rules for the specific stretch.
What's coming
Plan ahead
5-day outlook
Other water nearby · 2
About this water
A coarse fishery (barbel, carp, black bass in places), not trout water. Included for gauge/flow monitoring completeness on the Júcar main stem.
- Alluvial
The full read · show the working · for Barbel · confidence 75%
How the 42 is built — score × weight = contribution
Temperature21 × 28%5.9
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time40 × 13%5.2
Pressure75 × 7%5.3
Insect activity50 × 12%6.0
Limiting factor: Water temperature (9.5°C) is outside Barbel's preferred range (16–24°C)= 55
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 16–24 °C ideal band — would lift the temperature score.
The dawn and dusk windows score higher than the midday lull.
Directions
Related guides
Booking & contacts
At a glance
Río Júcar (Tramo Bajo — Valencia) is a lowland river in Valencia, Comunidad Valenciana, Spain. The catchment geology is recorded as alluvial, and the water sits at about 60 m above sea level. The species listed for this water is barbel. Best window recorded for anglers: Spring and autumn. Core methods listed: float fishing; spinning; bait fishing. Level and flow data for this water is linked from 2 gauges. Nearby waters in our listings include Río Magro at 59 km and Río Tuéjar at 83 km.