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5-acre lake near Gwynedd. The lake tops out around 22 ft. The contours come from a model of the real basin shape and its known max depth. Read them as probabilities, not soundings, and keep them out of navigation decisions. Here is how the season plays out for each species, straight from the data behind the map.
Drawn out, this is 5 acres of water rimmed by 0.4 miles of bank. A shoreline index of 1.2 says round and simple: fish relate to depth changes here, not shoreline features. Roughly 62% of the water is 15 ft or less as modeled, the band where the food chain lives. The water lies in Gwynedd. The nearest mapped water is Llyn Bodlyn, 1 mi to the west.
Early season brown trout use the shallows, holding in 3 to 22 ft. Even in summer they hold at 7 to 22 ft; winter keeps them in 3 to 22 ft. The chart's best answer is Break off the point — drop-off, 10 ft, prime for summer. Best bite is after dark and early morning. Tie on a spoon at the thermocline or a deep stickbait (night) and you're in the game.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 22 ft chart-limited; documented 3 to 25 ft | dawn & dusk | Main-lake point (8 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 7 to 22 ft chart-limited; documented 25 to 60 ft | night & dawn | Break off the point (10 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 4 to 22 ft chart-limited; documented 5 to 30 ft | dusk & dawn | Main-lake point (8 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 3 to 22 ft chart-limited; documented 5 to 35 ft | dawn | Break off the point (10 ft) | Jigging spoon, Small stickbait (slow) |
Spring puts european perch in skinny water — 3 to 12 ft is the zone. Warm water sends them out to 6 to 22 ft; cold water stacks them in 7 to 22 ft. Deep basin is the standout, a deep basin at roughly 19 ft, rated prime for fall european perch. Plan around early morning in the warm months. A drop-shot micro plastics or a small crankbait (perch pattern) covers the summer program.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Break off the point (10 ft) | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 6 to 22 ft chart-limited; documented 8 to 28 ft | dawn | Deep basin (19 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 7 to 22 ft chart-limited; documented 10 to 33 ft | midday | Deep basin (19 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 7 to 22 ft chart-limited; documented 12 to 33 ft | midday & dawn | Deep basin (19 ft) | Tungsten jig + maggots, Small balance jig |
Spring puts northern pike in skinny water — 2 to 8 ft is the zone. As the season builds they drop to 8 to 20 ft, wintering in 5 to 15 ft. Fall northern pike concentrate at Break off the point, a prime-rated drop-off around 10 ft. Warm-month bites cluster around early morning and the evening. A bucktail or a weedless spoon over cabbage covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | open water | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Break off the point (10 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Break off the point (10 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Main-lake point (8 ft) | Tip-ups, Large jigging spoon |
Llyn Dulyn carries 3 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 19 ft down.
Llyn Dulyn is about 22 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.
Anglers target brown trout, european perch, northern pike on Llyn Dulyn. 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.
Deep basin is the top-rated area: a deep basin in about 19 ft of water that rates prime for european perch in fall. The interactive chart above rates every spot for each species and season.
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.
Llyn Bodlyn 1 mi · Llyn Cwm-mynach 1 mi · Llyn y Bi 1 mi · Llyn Hywel 1 mi · Llyn Erddyn 2 mi · Gloyw Lyn 4 mi · Llyn Cwm Bychan 4 mi · Llyn Gwernan 6 mi · Llyn y Gadair 7 mi · Llyn Trawsfynydd 8 mi · Llyn Tecwyn Isaf 8 mi · Llyn Cau 8 mi
See how Llyn Dulyn stacks up: best northern pike lakes in United Kingdom · best european perch lakes in United Kingdom · best brown trout lakes in United Kingdom
More water nearby: Gwynedd fishing maps (35 charts). Browse all United Kingdom fishing maps. See every water on DepthScout. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.