TsureruKana · 釣れるかな？
Know when the fish will bite.
A daily fishing score for Japan's lakes and coast, built from the weather, pressure, water temperature, the moon and the tide. Plus feeding windows, tide tables and what to tie on.
- 6 lakesplus the coast and your own spots
- ~240 portsJMA tide tables
- 0–100daily score, days ahead
- Freeon Google Play
Plan the trip in three screens
When to go, when to cast, and what to tie on, before you've left the house.
🎣 Daily score
One score for today with the next few days beside it, so you can compare Saturday with Sunday at a glance.
⏰ Feeding windows
Solunar major and minor periods on a timeline, with reminders before the next one starts.
🪝 Lure picks
Lures matched to today's conditions and the most active species, with colour, retrieve, depth and size.
Everything you check before you go
The same things this site talks about, in one place.
Tide tables
High and low tides from the Japan Meteorological Agency for about 240 ports. Drag the curve to see the height at any time.
Species activity
Which fish, from largemouth and smallmouth bass to sea bream and squid, are likely to be more active, and why.
Depth, shore or boat
A suggested depth to start at, and how your chances compare from the shore and from a boat.
Lake rules
Permits, size limits, no-release species and gear rules for each lake. More in our lake-by-lake rules guide.
Your own spots
Save a river bend or a pier and get the same score, windows and lure picks as the built-in lakes.
Pick your weather model
Auto, ECMWF, ECMWF AI or ICON. Choose the forecast behind your conditions in Settings.
Learn from your best days
Log each fish, and the app remembers the conditions you caught it in.
- Catch log: photos, species, length, weight, the lure and where you fished from.
- Conditions saved: weather, pressure and time of day are stored with every catch, so a season of notes shows what your good days had in common.
- Share the forecast: send today's score, windows and lure pick to your fishing buddies as an image.
Put the forecast on your home screen
The widget shows today's score and the next bite window without opening the app.
- Install and pick a lake Get TsureruKana from Google Play, open it once and choose your lake or spot.
- Open Widgets Long-press an empty spot on your home screen and tap Widgets.
- Add TsureruKana Find it in the list and drag the widget onto your home screen.
Menu names vary a little between phone makers.
Questions
Short, honest answers.
Is TsureruKana free?
Yes. It's free on Google Play.
Is there an iPhone version?
Not yet. TsureruKana is on Android today and an iPhone version is coming soon. Until then, our guide to the six lakes covers what to fish for and when.
Which lakes and areas does it cover?
Lake Biwa, Kasumigaura, Saroma, Ogawara, Inawashiro and Suwa, saltwater areas around Japan, tide tables for about 240 ports, and any spot you save yourself.
Does a high score guarantee fish?
No. The score is an estimate built from environmental data. It tells you whether conditions look better or worse than usual, and a "poor" day can still give you your best catch of the year. The moon is the weakest input on the four freshwater lakes, for the reasons in how moon phase affects your bite window. Check it alongside the weather, not instead of it.
How accurate are the tide times for Saroma and Ogawara?
The tables are for ports. The tide inside a lagoon can run later and smaller than at the port outside, so treat the times as approximate. More in the Lake Saroma and Lake Ogawara guides.
Where does the data come from?
Weather data comes from Open-Meteo.com, and tide predictions are based on the Japan Meteorological Agency's tide tables. If you use your current location, the app uses it for that forecast and doesn't track it in the background.
Updated
Will it bite today?
Check the score before you pack the tackle box.
Guides for your trip
Everything else you need to fish Japan's lakes.