Tuesday · May 12

Lahti, Finland

· · Check licenses

🎣 Good day to head out — pressure rising all evening

Ti 12.5 TROPHY DAY

87 / 100

Bite windows today

Dawn

17:30–19:45

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Best

17:30–19:45

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Night

23:00–02:00

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Target species: Ahven

Why now

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How this confidence is calculated

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Where

Choose lake and species…

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With

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Open map

Today's best spots

0 / 8

Recommended lures · casting

— · —

Hardbaits (cranks / spoons / spinners)

Jigging (jigs / soft plastics)

Shore casting (long-cast)

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

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

Clarity Clear

Level -2 cm

Thermocline ~7 m

Demo values · not yet connected to Open-Meteo

New to fishing?

Rod recommendations · Regulations · Starter tips

Detailed windows & signals

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

—

Reading conditions…

Baitfish detection COMING

Research's strongest single signal is the location of vendace/herring schools — predators lurk at the school edges.

Connect sonar (Lowrance / Garmin / Humminbird Bluetooth) → see schools on the map in real time

Sentinel-3 satellite shows chlorophyll (plankton → vendace → predator)

User observations — "saw a school at 17:30 east of Enonsaari" → other users benefit

Trophy recipe detector

0/5 fit

Pick a species to see trophy windows

Live analysis: when ≥4/5 conditions are met, trophy chance is exceptional. Based on BIG_FISH_DATA + current weather + selected species.

Weekly notification

Get a Sunday-evening summary of the week's best bite times — plan your trips ahead.

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Background & accuracy

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

Algorithm transparency

Alpha

BiteWave's scoring is based on peer-reviewed research, not fabricated accuracy claims. We don't have enough verified user catches yet to claim a hit rate. Here's what we DO know:

Peer-reviewed studies in the algorithm

Signals combined in scoring

Lakes with limnological data

Species with research data

Your logged catches

total catches

in last 30 days

—

Your largest catch

Honest disclosure: We are in alpha. As user catches accumulate, this card will show real hit accuracy per region and species — not before. Competitor comparison is intentionally hidden until we have verifiable data.

How calculated

How the algorithm calculates & what it cannot

How confidence % is calculated

BiteWave's score combines 20+ signals into one 0–100 number per spot, species and time. Weighting is research-based: peer-reviewed factors count more, folklore (like solunar) near zero.

What goes into the score

Bottom structure × species × season

Decisive HIGH

Baitfish proximity (school nearby)

Raises HIGH

Depth vs. thermocline

Varies HIGH

Water clarity (Secchi depth)

Lowers HIGH

Water color × lure color

Varies HIGH

Light context (time of day × cloud cover)

Varies HIGH

Water temp × lure size

Raises MID

Cold front detector

Raises MID

Temp anomaly vs. summer baseline

Raises MID

Thermocline match (lure dive depth)

Raises MID

Lake size (silhouette scaling)

Raises MID

Lake type (oligotr/eutroph/humic) × color

Raises MID

Wind angle to structure

Raises HIGH

Wind × lure color

Raises MID

Pressure trend (falling/rising)

Varies MID

Spot recent fishing pressure

Lowers MID

Vendace-lake match

Raises HIGH

Turbid water → fluoro (Vogel & Beauchamp 1999)

Raises HIGH

Solunar major/minor (folklore)

Minimal WEAK

Baitfish, structure and water color decide it — peer-reviewed evidence. Solunar is kept because anglers expect it, but its weight is near zero (a 2023 salmonid study found no effect).

Data sources: NOAA · ECMWF · ICES · Luke (Natural Resources Institute Finland).

What we can't promise

Honestly: fishing can't be fully predicted — nature is nature. These are things BiteWave cannot tell you reliably, no matter how much data:

Fish mood (sated vs. hungry, spawning) doesn't show in data

Solunar peaks refuted in peer-reviewed research (2023) — offered only because users expect them

Air pressure level alone has no effect on fish behavior — the relevant signal is pressure change

Individual trophy fish move differently than the population average — they cannot be predicted from average data

Sudden oxygen drops / algae blooms on eutrophic lakes require real-time water sensors (rare)

Local fishing pressure without community data is unknown

That's why your catch logs are the only way to truly improve predictions — every log teaches the AI more about your spots than any scientific model.

Weather

14 °C

Pressure 1014

Wind S 4 m/s

Cloud 70%

Water

11 °C

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

Recommended baits · float fishing

—

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

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

Bream spawning in 7–10 days

Water warming to 14°C → bream schools move to shallow shores. The best bait-fishing window of the year starts now. 2–3m depth, quiet shores and bays.

Most active today

Bream

●●●●○

Second best

Roach

●●●○○

Today's bait recommendations

🪱

Worm (nightcrawler) ●●●●●

Classic — works for almost everything

Target: Bream, perch, roach, burbot

Keep worm alive — bring moist moss

🌽

Sweetcorn (canned) ●●●●○

Bream and roach love it

Target: Bream, roach, rudd

2–3 grains per hook, no more

🎣

Worm + corn (combo) ●●●●●

Bunch-style for bream

Target: Big bream · big roach

Worm on bottom, corn on top → buoyancy

🍞

Bread paste ●●●○○

Great with kids, cheap

Target: Roach, rudd, perch

Mix water + bread → sticky paste

🪰

Maggots ●●●●○

Competition anglers' #1

Target: Roach, rudd, perch

1–3 maggots on hook — lively wiggle attracts

Rod setups · ready combos

Beginner — whole family

€20–40

RodTelescopic 3–4m

LineMono 0.20mm

HookSize 8–10

FloatStick float 3g

Weight2–3g split-shot

Great for kids, easy to carry

Bream specialist

€80–200

RodBolognese 5–6m

LineMono 0.18mm + leader 0.14

HookSize 10–14

FloatBolognese float 1–4g

WeightShot chain + bulk

Long rod = float control + reaches deeper

Roach / competition

€150–500

RodPole 7–13m

LinePole-line 0.10–0.14

HookSize 16–22

FloatPole-float 0.4–1g

WeightMicro-shot + bulk

Precise presentation — fast bites

Today's bait-fishing spots · Vesijärvi

Boat dock

Pier on the north shore · 1–2m · weed edge

Bream · roach

Shore-fishing beach

Sandy bottom shore · 1.5m · no weed

Perch · roach

Small river backwater

River slack water · 0.5–1.5m · flowing

Ide · rudd

Bait-fishing tip today: When the sun is high, fish move to deeper and shadier spots. Go before 10am or after 4pm — and target dock edges or weed lines.

Bait fishing is free for everyone — general public-water fishing right. With just a bait pole (worm + hook + float, no lures), you can fish anywhere on general waters in Finland without a fishing-management fee, regardless of age. Perfect for kids and beginners.

Licenses & regulations

Vesijärvi · 🇫🇮

Public fishing right · float + ice — free for all

Fisheries management fee · lure fishing + trolling, age 18–64 · €47/yr 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

50 cm

Whitefish

40 cm

Salmon

60 cm

Pike

free

Perch

free

Burbot

free

Bream

free

⚠ = 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.

Save your catches to the cloud

Coming soon — alpha sign-up

Sync catches across devices. Get personalized accuracy stats. Premium features.

No password — magic link by email · GDPR-compliant · export & delete any time

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Units

Temperature

Wind speed

Distance

Mixed (e.g. °F + km)

Log your catch when you return

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.

Based on

Scientific basis

Open-Meteo · Finnish Met Office

SYKE INSPIRE WMS (Finland)

EMODnet · CHS NONNA · Kartverket

Lunar position + astronomy

User observations

Eräluvat.fi licenses

Peer-reviewed (LUKE, JYU, Hydrobiologia)

LakeWiki + LakeResearch DB

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).

Feedback

BiteWave v0.40.48 · build 2026-07-10·08:05

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24 Finnish + 32 US + 7 Canada + 24 European + 1 Amazon · 17 species (incl. bass, walleye, muskie) · research-based recommendations.

Switch target species

Vesijärvi · Today

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

Vesijärvi

Today's best spots

Recommended lures · casting

Detailed windows & signals

Background & accuracy

About this lake

How the algorithm calculates & what it cannot

Today's trolling spread

Recommended lures · research

Multi-species spread

Tandem trolling · tandem rig

Recommended baits · float fishing

Today's bait fishing

Recommended ice jigs · winter

What works in winter

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