Stoneflies
Gammarids
- Ecology: Good
- Chemical: Unknown
NRW (Wales) · UKGB110065053730
Rules at a glance
- Fly only
Water temperature for Atlantic Salmon
Ideal12°C est.ideal 10–16°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Mainly autumn. Fish on the drop after rain — 12 to 24 hours into a falling spate.
Where
Lower Dwyfor pools above the tidal limit near Llanystumdwy.
Method
Small doubles 10 to 12 across-and-down on a floating line; small tubes on a sink-tip in spring or coloured water. Fish the named lies in each pool, working systematically before moving on. Mandatory catch-and-release under NRW byelaw — every salmon goes back.
Kit
10 ft #7/8 single-hander or 11 ft switch — small spate scale; double-handers are wasted on these rivers. Floating line plus light sink-tip. 10 to 12 lb fluoro tippet.
Why this works
Good — water temperature is working for you, but time of day is the limiting factor today.
Likely species
Hatch timeline · todayPeak at 18 Uhr
12 Uhr(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 43%
Also:Black Gnat37%Autumn Olive28%
Peak emergence windowWeather boost7 food groups active
Peak activity at 18 Uhr — Caperer (Caperer, Weather boost)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Supporters see what else is on the menu.
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
Salmon runRun
1
2
2
2
2
2
1
Sea trout runRun
1
2
2
2
2
2
2
1
Trout seasonSeason
1
2
2
2
2
2
1
March BrownHatch
2
3
2
CapererHatch
2
3
3
2
Heather FlyHatch
2
2
Autumn DunHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Atlantic Salmon
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
Afon Dwyfor below Pont Llanystumdwy, Gwynedd, Wales. Terrain map
Water quality (WFD)
Why this score · for Atlantic Salmon
- Temperature10030% weight
- Flow6025% weight
- Clarity9520% weight
- Feeding Time1015% weight
- Pressure8510% weight
Directions
Seasons & zones
- Salmon 1 April → 17 October
- Sea trout 3 March → 17 October
- Trout 3 March → 30 September
Sea trout: Variable seasonal (2026) — NRW 2024 catchment summary classifies sea trout as at risk with a downward trend. Acid flushes, abstraction regulation, and small-catchment volatility all bear on the runs. Honest small-river sport when conditions align — not a destination.
Related guides
Casting instructors near here
Booking & contacts
Boards & regulators
Dwyfor / Dwyfach
Water temperature for Atlantic Salmon
Ideal12°C est.ideal 10–16°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Mainly autumn. Fish on the drop after rain — 12 to 24 hours into a falling spate.
Where
Lower Dwyfor pools above the tidal limit near Llanystumdwy.
Method
Small doubles 10 to 12 across-and-down on a floating line; small tubes on a sink-tip in spring or coloured water. Fish the named lies in each pool, working systematically before moving on. Mandatory catch-and-release under NRW byelaw — every salmon goes back.
Kit
10 ft #7/8 single-hander or 11 ft switch — small spate scale; double-handers are wasted on these rivers. Floating line plus light sink-tip. 10 to 12 lb fluoro tippet.
Why this works
Good — water temperature is working for you, but time of day is the limiting factor today.
Likely species
Hatch timeline · todayPeak at 18 Uhr
12 Uhr(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 43%
Also:Black Gnat37%Autumn Olive28%
Peak emergence windowWeather boost7 food groups active
Peak activity at 18 Uhr — Caperer (Caperer, Weather boost)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Supporters see what else is on the menu.
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
Salmon runRun
1
2
2
2
2
2
1
Sea trout runRun
1
2
2
2
2
2
2
1
Trout seasonSeason
1
2
2
2
2
2
1
March BrownHatch
2
3
2
CapererHatch
2
3
3
2
Heather FlyHatch
2
2
Autumn DunHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Atlantic Salmon
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
Afon Dwyfor below Pont Llanystumdwy, Gwynedd, Wales. Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
NRW (Wales) · UKGB110065053730
Why this score · for Atlantic Salmon
- Temperature10030% weight
- Flow6025% weight
- Clarity9520% weight
- Feeding Time1015% weight
- Pressure8510% weight
Directions
Seasons & zones
- Salmon 1 April → 17 October
- Sea trout 3 March → 17 October
- Trout 3 March → 30 September
Sea trout: Variable seasonal (2026) — NRW 2024 catchment summary classifies sea trout as at risk with a downward trend. Acid flushes, abstraction regulation, and small-catchment volatility all bear on the runs. Honest small-river sport when conditions align — not a destination.
Related guides
Casting instructors near here
Booking & contacts
Boards & regulators