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Fishing Llyn Isaf: what the data says
5-acre lake near Ceredigion. The lake tops out around 23 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. Species by species, here's what the data says the year looks like.
The drawn water covers 5 acres wrapped in 0.4 miles of bank. The basin is a simple one (shoreline index 1.4) — close to a bowl, so the structure on the chart matters more than the bank. Roughly 64% of the water is 15 ft or less as modeled, the band where the food chain lives.
Brown Trout fishing at Llyn Isaf
Start shallow in spring: brown trout sit in 3 to 23 ft that time of year. The depth story barely changes: 7 to 23 ft through summer, 3 to 23 ft in winter. The spot to know is Break off the point, a drop-off in about 10 ft of water that rates prime for brown trout in summer. Warm-month bites cluster around after dark and early morning. Throw a spoon at the thermocline or a deep stickbait (night) until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 23 ft | dawn & dusk | Main-lake point (8 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 7 to 23 ft | night & dawn | Break off the point (10 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 4 to 23 ft | dusk & dawn | Main-lake point (8 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 3 to 23 ft | dawn | Break off the point (10 ft) | Jigging spoon, Small stickbait (slow) |
European Perch fishing at Llyn Isaf
When the water first warms, european perch slide up into 3 to 12 ft. By summer they slide out to 7 to 23 ft, and by winter most fish are in 7 to 23 ft. If you only fish one area, make it Deep basin: a deep basin around 20 ft that scores prime in fall. In summer the feeding windows fall in early morning. Keep a drop-shot micro plastics or a small crankbait (perch pattern) rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | open water | 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 Isaf
Spring northern pike on Llyn Isaf hold shallow, usually 2 to 8 ft. By summer they slide out to 8 to 20 ft, and by winter most fish are in 5 to 15 ft. The chart's best answer is Break off the point — drop-off, 10 ft, prime for fall. Prime time lands in early morning and the evening. The summer box starts with a bucktail or a weedless spoon over cabbage.
| 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 |
Notable structure
- Deep basin: deep basin, around 20 ft
- Break off the point: drop-off, around 10 ft
- Main-lake point: point, around 8 ft
Common questions
How deep is Llyn Isaf?
Llyn Isaf 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 Isaf?
Anglers target northern pike, european perch, brown trout on Llyn Isaf. 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 Isaf?
Deep basin is the top-rated area: a deep basin in about 20 ft of water that rates prime for european perch in fall. Every other rated spot, per species and season, is on the map above.
When is the best time to fish Llyn Isaf?
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 Fyrddon Fawr 3 mi · Llynnoedd Ieuan 4 mi · Llyn Cerrigllwydion Isaf 4 mi · Llyn Hîr 5 mi · Llyn Teifi 5 mi · Llyn Egnant 5 mi · Llyn Gynon 7 mi · Bugeilyn 10 mi · Llyn Clywedog 10 mi · Maes-Llyn 11 mi · Llyn Cwm-byr 11 mi · Llyn Penrhaeadr 11 mi
See how Llyn Isaf stacks up: best northern pike lakes in United Kingdom · best european perch lakes in United Kingdom · best brown trout lakes in United Kingdom
Browse all United Kingdom fishing maps or see every water on DepthScout. How we build these maps. For fishing guidance only, never navigation.