Gammarids
- Ecology: Good
- Chemical: Unknown
WFD classification · ES017MSPFES002MAR002380
Rules at a glance
- Public water
- Licence required
Water temperature for Brown Trout
Ideal13°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 12 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
Supporters see the full sub-surface read.
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
Trout seasonSeason
1
1
Daddy Long LegsHatch
2
3
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Brown Trout
Permits & access
Permit required — see local rules.
- Se requiere licencia de pesca del Gobierno de Navarra
- Las normas de agua fronteriza y de tramo nominal son relevantes aquí, así que comprueba el tramo exacto y la estructura de permisos antes de viajar
- No trates este coto como un destino de planificación para salmón.
What's coming
Plan ahead
5-day outlook
Fishing better nearby · 5
Gallery · 2
Terrain map
Water quality (WFD)
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity55 × 12%6.6
Conditions total= 80
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 1 May → 30 June
RSS Baztan–Bidasoa basin (9,898 permits in 2026 — largest allocation in Navarra). All catch-and-release. Extendable to 15 Jul by resolution. Daily basin permit required. IMPORTANT: the Tramo Salmonero (presa de Fundiciones de Bera to Endarlatsa) is CLOSED for all of 2026 — this entry covers trout fishing in the broader Baztan–Bidasoa basin, not the salmon beat.
Sea trout: Variable seasonal (2026)
Related guides
Booking & contacts
Bidasoa tributaries (Navarra side)
Water temperature for Brown Trout
Ideal13°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 12 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
Supporters see the full sub-surface read.
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
Trout seasonSeason
1
1
Daddy Long LegsHatch
2
3
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Brown Trout
Permits & access
Permit required — see local rules.
- Se requiere licencia de pesca del Gobierno de Navarra
- Las normas de agua fronteriza y de tramo nominal son relevantes aquí, así que comprueba el tramo exacto y la estructura de permisos antes de viajar
- No trates este coto como un destino de planificación para salmón.
What's coming
Plan ahead
5-day outlook
Fishing better nearby · 5
Gallery · 2
Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · ES017MSPFES002MAR002380
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity55 × 12%6.6
Conditions total= 80
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 1 May → 30 June
RSS Baztan–Bidasoa basin (9,898 permits in 2026 — largest allocation in Navarra). All catch-and-release. Extendable to 15 Jul by resolution. Daily basin permit required. IMPORTANT: the Tramo Salmonero (presa de Fundiciones de Bera to Endarlatsa) is CLOSED for all of 2026 — this entry covers trout fishing in the broader Baztan–Bidasoa basin, not the salmon beat.
Sea trout: Variable seasonal (2026)
Related guides
Booking & contacts