Tuesday · May 12

Lahti, Finland

· · Check licenses

Ti 12.5 TROPHY DAY

87 / 100

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Why

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How this confidence is calculated

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With

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Lures: top 3 today

Recommended lures · casting

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Hardbaits (cranks / spoons / spinners)

Jigging (jigs / soft plastics)

Shore casting (long-cast)

Updates with species, cloud level, water temperature and season. On the map the list is recalculated for the depth of the selected spot.

Conditions and 7 days

Fishing calendar · 7 days

Tap a day to see why

Real 7-day forecast (Open-Meteo). Score 0–100 from cloud, wind, rain & temperature. Peak = dusk feeding window. Weather can change — check closer to your trip.

Weather

14 °C

Pressure 1014

Wind S 4 m/s

Cloud 70%

Water

11 °C

estimate from air temperature

Clarity Clear

Level -2 cm

Thermocline ~7 m

Demo values · not yet connected to Open-Meteo

Wind and depth

Wind angle → Enonsaari

OPTIMAL

40° angle

OPTIMAL — baitfish pack against the structure

Wind S 4 m/s · Structure 220°

Optimal zone (green) = 30–60° (peer-reviewed Langmuir)

What depth today

— meters

Surface 15m

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Reading conditions…

Spots and facts for this lake

Today's best spots

0 / 8

About this lake

Vesijärvi

Lahti, Suomi · 110 km² · max 42 m · avg 6 m

Vesijärven fisheries area

Species (most popular first)

kuha hauki ahven taimen (istukas) made lahna

Known spots

East tip of Enonsaari · rock drop-off 4–6 m

Vääksy canal mouth · flowing-water spot

Pataluoto · deep-hole edge 5–8 m

Best season

Zander May–August · Perch July–August

Good to know

Finland's most-studied zander lake — fish stock restored since the 1990s

Thermocline typically 5–8 m in summer

Lohjanjärvi

Lohja, Suomi · 88 km² · max 55 m · avg 13 m

Karjaanjoki watershed fisheries area (KHS 2022–2031, Lohjanjärvi 1. kategoria)

Species (most popular first)

kuha hauki ahven lahna made

Known spots

Mustlahti · deep hole · zander

Karkali · rocky shores + drop-off (point tip)

Maikkalansalmi · flowing strait · brown trout

Karkalinniemi · Karkali nature reserve · big perch

Liikkiö · north end of Isoselkä · zander + perch (2012 Finnish ice fishing championships)

Aurlahti · bay · spawning closure 1.–31.5. · Kuhanuistaja competition

Pensaarensalmi · warm paper mill discharge · big fish

Paloniemi · point north of Aurlahti · perch

Lippukari · lake monster statue · shoal (exact spot)

Haikari (Liessaari) · east side of Liessaari · perch/roach

Moisionlahti · bay · spawning closure 1.–31.5.

Pähkinäniemi (Virkkala) · shallow 2–3 m, clay pits 10 m+ · perch

Suurniemi · Karjalohjanselkä · rocky point · reliable catch

Best season

Zander July–August · perch in autumn · Kuhanuistaja competition in July (Aurlahti)

Good to know

Deepest lake in southern Finland (55 m) → thermocline ~9 m in summer

Water quality varies by basin: Karjalohjanselkä best (clear) · Maikkalanselkä + town-center waters weakest · Isoselkä deep hole >4 mg/l O₂ year-round (LUVY 2023)

Mustionjoki fishways unfinished (Peltokoski + Mustionkoski) → migratory fish passage from the sea blocked

Blue-green algae blooms atypically in September–October — check late-season conditions before the trip

Spawning closure 1.–31.5.: Moisionbay · Pappilanselkä · Ristiselkä · Aurbay · Savishoal — only float fishing + rod fishing from shore

Pike minimum size 45 cm (differs from the national limit) — in force 2024–2033

Restrictions in Karkali nature reserve

Other spots recommended by locals (location uncertain in map sources): Karstunbay · Hållsnäsfjärden · Karkapeninsula · Tammistonpeninsula · Voudinpuisto · Vivamo

Trophy recipes and weekly alert

Trophy recipe detector

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Pick a species to see trophy windows

When at least 4 of 5 conditions are met, the chance of a trophy fish is exceptional. Based on big-fish catch records, today's weather and the selected species. Recipes list the lakes where each record was set.

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How this is calculated

Weather

14 °C

Pressure 1014

Wind S 4 m/s

Cloud 70%

Water

11 °C

estimate from air temperature

Clarity Clear

Level -2 cm

Thermocline ~7 m

Demo values · not yet connected to Open-Meteo

Tandem trolling · Vesijärvi

Today's trolling spread

Species-specific 4-rod setups · switch species in the header

Optimal speed today · Perch

CALCULATED

2.5 km/h (range 2.0–3.0)

Water 11 °C + perch activity = slow/medium, gives the small lure time to work

Route: 3–7 m contour line · perch follows baitfish shallow

⚠ Speed = relative to water (not GPS). Wind distorts — check the compass display.

Recommended lures · research

— · —

Same recommendation as on the map — updates with species, depth, water temp, wind and season.

Multi-species spread

Pick a species per box — 3 condition-optimized lures each. Updates live with weather.

Box 1

Box 2

Box 3

Trolling speed per species + temperature

km/h · by water temperature · adjust ±0.3 km/h until you hit

Species	Cold <10°C	Cool 10–15°C	Warm 15–20°C	Hot >20°C
Perch	2.0–2.5	2.0–3.0	3.0–4.0	3.5–4.5
Pike	2.5–3.0	3.5–5.0	4.0–5.0	4.5–5.5
Walleye	<2.0	2.5–3.5	2.5–3.5	4.0–5.5
Brown trout	2.0–2.5	2.5–4.5	4.0–5.0	4.5–5.5
Landlocked salmon	2.0–2.5	2.5–3.0	3.0–3.5	3.5–4.0

Speed = relative to water, not GPS. Wind distorts — that's why bites only come in one direction.

Lure color · water × depth

Long wavelengths (red) fade fast in water — only bright colors work deep

Water	0–3m	3–8m	8m+
Clear	Natural vendace, silver-black	Silver-blue, holographic	Glow-white, UV-blue
Stained (humic)	Chartreuse, fluo-yellow	Firetiger, orange-black	Pink-purple, glow
Murky / silty	Solid black + contrast	Chartreuse + rattle	UV-pink, rattle mandatory

Walleye sees only green + orange/red (no blue) → chartreuse + yellow is uniquely visible to walleye.

Pro tips · order by impact

1. When you get strikes → copy all rods to the same setup

If rod 2 hit (40 m back, 5 m deep, perch-colored jerkbait), adjust the other rods to the same combination before the next pass.

2. Make a 180° turn back to the same spot

The strike often happens because the boat passed over the school. The turn brings the spread back to the same spot.

3. Run S-curves, not straight lines

In turns the outer rod speeds up, the inner one slows — same spread tests two speeds.

4. Find baitfish schools on sonar — drive around, not through

Predators ambush the edges of the school. Drive around at 30–50 m distance.

5. Check lures every 15–20 min

A bit of debris or algae on the hook = zero strikes. Amateurs' #1 hidden mistake.

6. Regulation: Finland allows 14 rods per boat, Sweden 10

1 government licence covers 1 rod. Extra rods require a local permit from the fishing district.

5 most common mistakes

×Same speed + direction the entire trip

✓Vary speed in 0.2 km/h steps every 5 min until you connect

×Too many rods → tangles in every turn

✓Start with 3 rods, add more only when spread control is automatic

×Stiff rod + braid → you lose fish at boatside

✓Softer (medium-action) rod absorbs head-shakes, mono line stretches

Trolling guide: speeds, colours, tips

Recommended baits · float fishing

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Updates with species, season, water temp and time of day.

Weather

14 °C

Pressure 1014

Wind S 4 m/s

Cloud 70%

Water

11 °C

estimate from air temperature

Clarity Clear

Level -2 cm

Thermocline ~7 m

Demo values · not yet connected to Open-Meteo

Bait fishing recommendations · Vesijärvi

Today's bait fishing

May = bream spawn approaching → bait season at its peak

Float fishing guide: baits, rods, rights

Licences and size limits

Licenses & regulations

Vesijärvi · 🇫🇮

Public fishing right · float + ice — free for all

Fisheries management fee · lure fishing + trolling — check current price and age limits at eraluvat.fi

Local fishing area permit · separate in many areas

Trolling special permits · different rod-count rules on many waters

Eräluvat.fi Fishing associations

Size limits (national/state level)

Zander

42 cm

Brown trout

see note

Landlocked salmon

see note

Grayling

35 cm

Arctic char

see note

Whitefish

local rules

Pike

free

Perch

free

Burbot

free

Bream

free

Brown trout: fin-clipped (stocked) 50 cm. A trout WITH its adipose fin is wild and fully protected in inland waters south of latitude 67°N — release it regardless of size.
Landlocked salmon is protected in the Vuoksi watershed (Saimaa) — release it. Elsewhere 60 cm.
Arctic char is protected in the Saimaa area. Elsewhere in the Vuoksi watershed 60 cm.
Grayling has a closed season 1 Apr–31 May south of latitude 67°N.
Zander has no national closed season, but local fisheries areas may set one.
Whitefish has no single national minimum size in inland waters — the local fisheries area decides.

⚠ = closed season may apply · Check local rules

Verify yourself — we only show what we found: Permit situation varies by law, local fisheries area decisions and contracts. The app lists what was found in open data, but it is the user's responsibility to verify a valid license before every trip.

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Units

Temperature

Wind speed

Distance

Mixed (e.g. °F + km)

Safety, licences and liability

Safety: check ice conditions, weather changes and life jacket use before going out. ⚠ Trolling routes and spot markers are data-based suggestions — DO NOT follow the line blindly. Watch the map, your sonar, and your eyes ahead at all times. Reefs, rocks, shallows, and fog-related visibility are your responsibility. The app is not liable for groundings, collisions, or weather changes.

Important: Recommendations are forecasts — surprises happen in nature. Verify valid licenses, minimum sizes and closed seasons before your trip. Regulations may change mid-season.

Catch & release: if you don't need the fish for food, release carefully. Use barbless hooks for sensitive species (trout, zander during spawn).

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Vesijärvi · Today

Activity estimates are based on weather + moon for today. Protected species are locked per regulations.

Vesijärvi

Recommended lures · casting

Today's best spots

About this lake

Today's trolling spread

Recommended lures · research

Multi-species spread

Tandem trolling · tandem rig

Recommended baits · float fishing

Today's bait fishing

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What works in winter

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