- Ecology: Good
- Chemical: Unknown
What this classification means
EPA WFD 2019-2024 — Good ecological status; filled 2026-06-18. Source: EPA Ireland WFD 2019-2024 classification (catchments.ie / EDEN).
EPA (Ireland) · IEWE_31C080760
Rules at a glance
- Permit required
- Fly only
Water temperature for Atlantic Salmon
Welfare risk22°C est.ideal 10–14°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Morning into early afternoon.
Where
Pool tails, steadier runs, and any water with pace.
Method
Fish a sensible line-and-fly combination for the height and pace of water.
Kit
13 ft #8/9 double-hander in spate, 10 ft #8 single in low water. Floating line plus a fast-sink tip. 12–15 lb fluoro tippet.
Why this works
Water at 22.3°C. This is the line where catch-and-release kills atlantic salmon. Do not fish for them today.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 3 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
See what else is on the menu with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalModerate confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
2
1
Sea trout runRun
1
2
2
1
Daddy Long LegsHatch
2
3
2
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Atlantic Salmon fly box
Permits & access
Permit required — see local rules.
- Costello & Fermoyle fishery — private, managed by IFI
- Day tickets may be available
- State rod licence required
- Fly fishing only on the Costello and Fermoyle system; beats rotated and rod numbers strictly limited.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 3
Probably above the Atlantic Salmon safety line — these are likely cooler, but carry a thermometer.
Gallery · 2
Coastal water near Costelloe Lodge, the heart of the Costello / Fermoyle fishery, County Galway. Terrain map
Water quality (WFD)
The full read · show the working · for Atlantic Salmon · confidence 90%
How the river scores — hydrology factors
Water heightMedium Ideal0.0
Recent riseNone0.0
Falling after liftNot Applicable0.0
Water temperatureCool To Moderate0.0
Time in seasonOpening Period0.0
ClarityClearing0.0
Hydrology base0.0
Legal gate: Unknown Check Local Rules
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Erriffproxy
Directions
Seasons & zones
- Salmon 1 February → 30 September
- Sea trout 1 June → 30 September
Sea trout: Variable seasonal (2026) — Costello / Fermoyle is one of the original Connemara fisheries documenting the 1989/1990 sea-trout collapse. IFI 2023–2025 evidence shows volatility — strong runs in some years, near-empty in others. Western fishery district catch-and-release / retention restrictions apply.
Related guides
Casting instructors near here
Booking & contacts
Costello / Fermoyle
Water temperature for Atlantic Salmon
Welfare risk22°C est.ideal 10–14°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Morning into early afternoon.
Where
Pool tails, steadier runs, and any water with pace.
Method
Fish a sensible line-and-fly combination for the height and pace of water.
Kit
13 ft #8/9 double-hander in spate, 10 ft #8 single in low water. Floating line plus a fast-sink tip. 12–15 lb fluoro tippet.
Why this works
Water at 22.3°C. This is the line where catch-and-release kills atlantic salmon. Do not fish for them today.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 3 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
See what else is on the menu with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalModerate confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
2
1
Sea trout runRun
1
2
2
1
Daddy Long LegsHatch
2
3
2
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Atlantic Salmon fly box
Permits & access
Permit required — see local rules.
- Costello & Fermoyle fishery — private, managed by IFI
- Day tickets may be available
- State rod licence required
- Fly fishing only on the Costello and Fermoyle system; beats rotated and rod numbers strictly limited.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 3
Probably above the Atlantic Salmon safety line — these are likely cooler, but carry a thermometer.
Gallery · 2
Coastal water near Costelloe Lodge, the heart of the Costello / Fermoyle fishery, County Galway. Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
What this classification means
EPA WFD 2019-2024 — Good ecological status; filled 2026-06-18. Source: EPA Ireland WFD 2019-2024 classification (catchments.ie / EDEN).
EPA (Ireland) · IEWE_31C080760
The full read · show the working · for Atlantic Salmon · confidence 90%
How the river scores — hydrology factors
Water heightMedium Ideal0.0
Recent riseNone0.0
Falling after liftNot Applicable0.0
Water temperatureCool To Moderate0.0
Time in seasonOpening Period0.0
ClarityClearing0.0
Hydrology base0.0
Legal gate: Unknown Check Local Rules
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Erriffproxy
Directions
Seasons & zones
- Salmon 1 February → 30 September
- Sea trout 1 June → 30 September
Sea trout: Variable seasonal (2026) — Costello / Fermoyle is one of the original Connemara fisheries documenting the 1989/1990 sea-trout collapse. IFI 2023–2025 evidence shows volatility — strong runs in some years, near-empty in others. Western fishery district catch-and-release / retention restrictions apply.
Related guides
Casting instructors near here
Booking & contacts