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Rating depth structure for zander.
Recent public catches load as you reach this section.
731-acre lake near Täby. The lake tops out around 4.5 m. The depth picture is modeled, anchored to the true shoreline and the water's published max depth — a scouting aid, never a chart to run a boat by. Species by species, here's what the data says the year looks like.
Ullnasjön mäter 302 hektar bakom 9.5 km strandlinje. Strandlinjen är måttligt strukturerad (index 1.5) — tillräckligt med uddar och vikar att fiska av. Räkna med 2.7 km vatten från ena änden till den andra och 1.8 km på bredden. Sjön ligger i Österåker kommun. Rönningesjön ligger 3.2 km åt sydväst — närmaste grannvatten på kartan.
Gratis interaktiv fiskekarta — Ullnasjön, Sverige: ungefärliga djupkurvor ner till 5 m (15 fot), och de bästa fiskeplatserna för abborre och gös. Djupkartan är modellberäknad från sjöns verkliga strandlinje och största djup — använd den som vägledning, aldrig för navigation.
Spring puts european perch in skinny water — 1 to 3.5 m is the zone. As the season builds they drop to 1 to 4.5 m, wintering in 1.5 to 4.5 m. Spring european perch concentrate at Shallow bay flat, a prime-rated weed flat around 1 m. Warm-month bites cluster around early morning. 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.
| Säsong | Djup | Bästa tid | Börja vid | Beten |
|---|---|---|---|---|
| Vår | 1 to 3.5 m | midday & dawn | Shallow bay flat (1 m) | Small jig + curly tail, Inline spinner #1-2 |
| Sommar | 1 to 4.5 m chart-limited; documented 2.5 to 8.5 m | dawn | Deep basin (4 m) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Höst | 1.5 to 4.5 m chart-limited; documented 3 to 10 m | midday | Deep basin (4 m) | Jigging spoon (small), Drop-shot on deep flats |
| Vinter | 1.5 to 4.5 m chart-limited; documented 3.5 to 10 m | midday & dawn | Deep basin (4 m) | Tungsten jig + maggots, Small balance jig |
Spring puts zander in skinny water — 1 to 4.5 m is the zone. Summer fish stay in 1.5 to 4.5 m, and winter fish hold in 1.5 to 4.5 m. Fall zander concentrate at Break off the point, a prime-rated drop-off around 2 m. Warm-month bites cluster around the evening and early morning. A vertical softbait over humps or a deep crankbait 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.
| Säsong | Djup | Bästa tid | Börja vid | Beten |
|---|---|---|---|---|
| Vår | 1 to 4.5 m | dusk & dawn | Main-lake point (2.5 m) | Softbait on jighead (10-12 cm), Shallow crankbait at dusk |
| Sommar | 1.5 to 4.5 m chart-limited; documented 4.5 to 11 m | dusk & dawn | Break off the point (2 m) | Vertical softbait over humps, Deep crankbait |
| Höst | 1.5 to 4.5 m chart-limited; documented 3.5 to 12 m | dusk & night | Break off the point (2 m) | Big softbait (12-16 cm) slow-rolled, Jigging spoon |
| Vinter | 1.5 to 4.5 m chart-limited; documented 6 to 12 m | dusk & dawn | Deep basin (4 m) | Vertical jig / mormyshka with bait, Slow blade bait |
When the water first warms, roach slide up into 0.5 to 3 m. Summer is a 1 to 4.5 m game here, winter a 1.5 to 4.5 m one. Start at Shallow bay flat. It's a weed flat holding about 1 m of water and rates prime come spring. The feeding windows run early morning and the evening. Keep a tiny spoon or a micro jig rigged through the warm months.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Säsong | Djup | Bästa tid | Börja vid | Beten |
|---|---|---|---|---|
| Vår | 0.5 to 3 m | midday & dusk | Shallow bay flat (1 m) | Micro jig under a float |
| Sommar | 1 to 4.5 m chart-limited; documented 1 to 5.5 m | dawn & dusk | Shallow bay flat (1 m) | Tiny spoon, Micro jig |
| Höst | 1 to 4.5 m chart-limited; documented 2.5 to 8.5 m | midday | Break off the point (2 m) | Tiny jig, Small silver spoon |
| Vinter | 1.5 to 4.5 m chart-limited; documented 3.5 to 11 m | midday | Deep basin (4 m) | Tungsten mormyshka |
Early season rudd use the shallows, holding in 0.5 to 2.5 m. Summer is a 0.5 to 3.5 m game here, winter a 1.5 to 4.5 m one. The chart's best answer is Shallow bay flat — weed flat, 1 m, prime for spring. Best bite is early morning and the evening. Tie on a tiny surface fly or a micro spoon 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.
| Säsong | Djup | Bästa tid | Börja vid | Beten |
|---|---|---|---|---|
| Vår | 0.5 to 2.5 m | midday & dusk | Shallow bay flat (1 m) | Micro jig, Tiny dry fly |
| Sommar | 0.5 to 3.5 m | dawn & dusk | Shallow bay flat (1 m) | Tiny surface fly, Micro spoon |
| Höst | 1 to 4.5 m chart-limited; documented 1.5 to 5.5 m | midday | Break off the point (2 m) | Micro jig |
| Vinter | 1.5 to 4.5 m chart-limited; documented 3.5 to 9 m | midday | Deep basin (4 m) | Tiny mormyshka |
In spring, ruffe run shallow here, mostly 1 to 4.5 m. Summer keeps them at 1.5 to 4.5 m, and they winter in 1.5 to 4.5 m. Summer ruffe concentrate at Deep basin, a prime-rated deep basin around 4 m. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a micro jig most summer days.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Säsong | Djup | Bästa tid | Börja vid | Beten |
|---|---|---|---|---|
| Vår | 1 to 4.5 m | dusk | Break off the point (2 m) | Tiny bottom jig |
| Sommar | 1.5 to 4.5 m chart-limited; documented 3 to 9 m | dawn & dusk | Deep basin (4 m) | Micro jig |
| Höst | 1.5 to 4.5 m chart-limited; documented 3.5 to 11 m | dusk | Deep basin (4 m) | Tiny jigging spoon |
| Vinter | 1.5 to 4.5 m chart-limited; documented 4.5 to 12 m | dusk | Deep basin (4 m) | Tungsten mormyshka |
In spring, tench run shallow here, mostly 0.5 to 3 m. Midsummer fish sit out in 1 to 3.5 m before dropping to 1.5 to 4.5 m for winter. Spring tench concentrate at Shallow bay flat, a prime-rated weed flat around 1 m. Fish it in early morning and the evening and you'll meet the bite.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Säsong | Djup | Bästa tid | Börja vid | Beten |
|---|---|---|---|---|
| Vår | 0.5 to 3 m | dusk | Shallow bay flat (1 m) | |
| Sommar | 1 to 3.5 m | dawn & dusk | Shallow bay flat (1 m) | |
| Höst | 1.5 to 4.5 m chart-limited; documented 2 to 5.5 m | midday | Break off the point (2 m) | |
| Vinter | 1.5 to 4.5 m chart-limited; documented 3.5 to 9 m | midday | Deep basin (4 m) |
6 pieces of structure are mapped here — Deep basin, around 4 m, is the deepest of them.
Season dates, license requirements, and size and bag limits for Sweden waters are set by the Svenska Fiskeregler (official Swedish rules service) — and special regulations can apply to Ullnasjön specifically, so confirm the current rules before you fish.
Check the official Sweden fishing regulations →
Ullnasjön is about 15 ft (5 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.
Ullnasjön är som djupast cirka 5 meter (15 fot). Djupkartan är modellberäknad från sjöns verkliga strandlinje — använd den som vägledning, aldrig för navigation.
Anglers target european perch, zander, roach, rudd, ruffe, tench on Ullnasjön.
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.
For european perch, the summer bite is best in early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Ullnasjön is regulated by the Svenska Fiskeregler (official Swedish rules service). Check the official Sweden regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Rönningesjön 2 mi · Issjön 3 mi · Storträsket 3 mi · Säbyträsk 4 mi · Vallentunasjön 4 mi · Garnsviken 5 mi · Fjäturen 6 mi · Rösjön 6 mi · Ekebysjön 6 mi · Ösbysjön 6 mi · Drängsjön 7 mi · Norrviken 7 mi
See how Ullnasjön stacks up: best zander lakes in Sweden · best european perch lakes in Sweden
More water nearby: Österåker Municipality fishing maps (26 charts). Browse all Sweden 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.