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Fishing Llyn Penrhyn: what the data says
55-acre lake near Isle of Anglesey. The lake tops out around 10 ft. The chart is a model: real shoreline, published maximum depth, interpolated in between. A planning tool, never a navigation product. Species by species, here's what the data says the year looks like.
Traced from the shoreline, Llyn Penrhyn runs 55 acres with 1.8 miles of edge. The shoreline is moderately structured (index 1.8) — enough points and pockets to pattern. Every acre of it sits shallower than ~15 ft: one big littoral zone, cover and forage throughout.
Brown Trout fishing at Llyn Penrhyn
Spring brown trout on Llyn Penrhyn hold shallow, usually 1 to 10 ft. Summer keeps them at 3 to 10 ft, and they winter in 1 to 10 ft. Put Break off the point first on the milk run — a drop-off near 5 ft that grades prime for summer. The feeding windows run after dark and early morning. The summer box starts with a spoon at the thermocline or a deep stickbait (night).
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 10 ft | dawn & dusk | Main-lake point (8 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 3 to 10 ft | night & dawn | Break off the point (5 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 2 to 10 ft | dusk & dawn | Main-lake point (8 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 1 to 10 ft | dawn | Break off the point (5 ft) | Jigging spoon, Small stickbait (slow) |
European Perch fishing at Llyn Penrhyn
In spring, european perch run shallow here, mostly 3 to 10 ft. The depth story barely changes: 3 to 10 ft through summer, 3 to 10 ft in winter. Spring european perch concentrate at Shallow bay flat, a prime-rated weed flat around 3 ft. Fish it in early morning and you'll meet the bite. You won't need more than a drop-shot micro plastics or a small crankbait (perch pattern) most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 10 ft | midday & dawn | Shallow bay flat (3 ft) | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 3 to 10 ft | dawn | Deep basin (9 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 3 to 10 ft | midday | Deep basin (9 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 3 to 10 ft | midday & dawn | Deep basin (9 ft) | Tungsten jig + maggots, Small balance jig |
Northern Pike fishing at Llyn Penrhyn
In spring, northern pike run shallow here, mostly 2 to 8 ft. Summer pushes them deeper, 3 to 10 ft, and winter fish settle into 3 to 10 ft. Shallow bay flat is the standout, a weed flat at roughly 3 ft, rated prime for spring northern pike. Time it for early morning and the evening. You won't need more than a bucktail or a weedless spoon over cabbage most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (3 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 3 to 10 ft | dawn & dusk | Shallow bay flat (3 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 3 to 10 ft | midday & dawn | Shallow bay flat (3 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 3 to 10 ft | midday | Shallow bay flat (3 ft) | Tip-ups, Large jigging spoon |
Notable structure
- Deep basin: deep basin, around 9 ft
- Main-lake point: point, around 8 ft
- Secondary point: point, around 8 ft
- Break off the point: drop-off, around 5 ft
- Shallow bay flat: weed flat, around 3 ft
Common questions
How deep is Llyn Penrhyn?
Llyn Penrhyn is about 10 ft (3 m) deep at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
What fish are in Llyn Penrhyn?
Anglers target northern pike, european perch, brown trout on Llyn Penrhyn. This isn't a survey of the water — none is published for it — but an informed estimate from the species common to the region, narrowed by this water's depth, size and each species' range.
Where is the best fishing spot on Llyn Penrhyn?
Shallow bay flat is the top-rated area: a weed flat in about 3 ft of water that rates prime for european perch in spring. The interactive chart above rates every spot for each species and season.
When is the best time to fish Llyn Penrhyn?
For brown trout, the summer bite is best in after dark and early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Nearby waters
Llyn Dinam 0 mi · Llyn Coron 6 mi · Llyn Alaw 8 mi · Llyn yr Wyth-Eidion 10 mi · Llyn Cadarn 11 mi · Llyn Padarn 19 mi · Llynnau Cwm Silyn 20 mi · Llyn Peris 20 mi · Llyn Cwellyn 20 mi · Llynnau Cwm Silyn 21 mi · Llyn y Gader 22 mi · Llyn Idwal 23 mi
See how Llyn Penrhyn stacks up: best northern pike lakes in United Kingdom · best european perch lakes in United Kingdom · best brown trout lakes in United Kingdom
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