Stoneflies
Gammarids
- Ecology: Good
- Chemical: Unknown
NRW (Wales) · UKGB110065053520
Rules at a glance
- Fly only
Water temperature for Atlantic Salmon
Ideal11°C est.ideal 10–16°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Mainly summer through autumn. Fish 6 to 12 hours into the drop after rain or a hydro release.
Where
Lower Dwyryd pools above the tide at Maentwrog and below.
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 · tomorrowPeak at 18h
12h(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 46%
Also:Autumn Olive29%
Peak emergence windowWeather boost7 food groups active
Peak activity at 18h — 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 Dwyryd at Maentwrog Terrain map
Water quality (WFD)
Why this score · for Atlantic Salmon
- Temperature10030% weight
- Flow6025% weight
- Clarity9520% weight
- Feeding Time3015% 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) — Both salmon and sea trout classified at risk by NRW with a downward sewin trend. Hydroelectric flow modification, slate legacy and acid flushes from conifer plantation all shape the runs. Honest spate sport when the water is right.
Related guides
Casting instructors near here
Booking & contacts
Boards & regulators
Dwyryd
Water temperature for Atlantic Salmon
Ideal11°C est.ideal 10–16°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Mainly summer through autumn. Fish 6 to 12 hours into the drop after rain or a hydro release.
Where
Lower Dwyryd pools above the tide at Maentwrog and below.
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 · tomorrowPeak at 18h
12h(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 46%
Also:Autumn Olive29%
Peak emergence windowWeather boost7 food groups active
Peak activity at 18h — 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 Dwyryd at Maentwrog Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
NRW (Wales) · UKGB110065053520
Why this score · for Atlantic Salmon
- Temperature10030% weight
- Flow6025% weight
- Clarity9520% weight
- Feeding Time3015% 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) — Both salmon and sea trout classified at risk by NRW with a downward sewin trend. Hydroelectric flow modification, slate legacy and acid flushes from conifer plantation all shape the runs. Honest spate sport when the water is right.
Related guides
Casting instructors near here
Booking & contacts
Boards & regulators