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Fishing Llyn Du: what the data says
5-acre lake near Gwynedd. The lake tops out around 23 ft. These contours are modeled — built from the real shoreline and the water's maximum depth — so read them as a guide, never as navigation. Here is how the season plays out for each species, straight from the data behind the map.
Llyn Du maps at 5 acres behind 0.3 miles of shoreline. A shoreline index of 1.1 says round and simple: fish relate to depth changes here, not shoreline features. About 56% of the surface sits shallower than 15 ft on the modeled chart — that's the weed-and-bait zone.
Brown Trout fishing at Llyn Du
Spring puts brown trout in skinny water — 3 to 23 ft is the zone. There's no big seasonal slide here — summer means 7 to 23 ft, winter 3 to 23 ft. Shoreline break is the standout, a drop-off at roughly 10 ft, rated prime for summer brown trout. Plan around after dark and early morning in the warm months. A spoon at the thermocline or a deep stickbait (night) covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 23 ft | dawn & dusk | Shoreline break (10 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 7 to 23 ft | night & dawn | Shoreline break (10 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 4 to 23 ft | dusk & dawn | Shoreline break (10 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 3 to 23 ft | dawn | Shoreline break (10 ft) | Jigging spoon, Small stickbait (slow) |
European Perch fishing at Llyn Du
Early season european perch use the shallows, holding in 3 to 12 ft. Summer is a 7 to 23 ft game here, winter a 7 to 23 ft one. The chart's best answer is Shallow bay flat — weed flat, 3 ft, prime for spring. Best bite is early morning. Tie on a drop-shot micro plastics or a small crankbait (perch pattern) and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Shallow bay flat (3 ft) | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 7 to 23 ft | dawn | Deep basin (20 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 7 to 23 ft | midday | Deep basin (20 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 7 to 23 ft | midday & dawn | Deep basin (20 ft) | Tungsten jig + maggots, Small balance jig |
Northern Pike fishing at Llyn Du
Come spring, look for northern pike tight to the bank in 2 to 8 ft. They move out to 8 to 20 ft in summer and finish the year down in 5 to 15 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 3 ft that scores prime in spring. Best bite is early morning and the evening. A bucktail or a weedless spoon over cabbage is the honest summer answer here.
| 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 | 8 to 20 ft | dawn & dusk | Shoreline break (10 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Shoreline break (10 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Shallow bay flat (3 ft) | Tip-ups, Large jigging spoon |
Notable structure
- Deep basin: deep basin, around 20 ft
- Shoreline break: drop-off, around 10 ft
- Shallow bay flat: weed flat, around 3 ft
Common questions
How deep is Llyn Du?
Llyn Du is about 23 ft (7 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 Du?
Anglers target northern pike, european perch, brown trout on Llyn Du. 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 Du?
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. Open the map above to see every rated spot for each species and season.
When is the best time to fish Llyn Du?
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 Tecwyn Isaf 5 mi · Llynnau Cwm Silyn 6 mi · Llyn y Gader 6 mi · Llynnau Cwm Silyn 6 mi · Llyn Llagi 6 mi · Llyn Llenyrch 6 mi · Llyn Edno 8 mi · Llyn Gwynant 8 mi · Llyn Cwellyn 8 mi · Glaslyn 8 mi · Llyn Cwm Bychan 8 mi · Llyn Llydaw 9 mi
See how Llyn Du 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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