These six lakes don't have much in common besides being on this list. Two are freshwater bass lakes, two are brackish coastal lagoons that barely qualify as "lakes" in the usual sense, one is a once-acidic lake that now grows record smallmouth bass, and one is famous for exactly one thing: winter smelt from a heated boat. Below is the practical version of each — what's in the water, the best time to go, and how to actually get there. To pick a month first, see the month-by-month calendar, and if it's your first time fishing in Japan, start with fishing in Japan as a visitor.
Lake Biwa (Shiga)
What's in the water
Non-native largemouth bass are the main draw — Biwa has produced fish that have rivaled the all-tackle world record, and it's the closest thing Japan has to a Southern U.S.-style bass lake. It's also home to two species found nowhere else on Earth: the Biwa trout (a landlocked salmon, Oncorhynchus masou rhodurus) and the giant Biwa catfish. Native ko-ayu — a dwarf sweetfish that spends its entire life in the lake instead of migrating to the sea — are a beloved family catch, plus crucian carp throughout.
Best season
Fishable close to year-round, but April–November is the reliable stretch. Spring (March–May) brings fewer bites but the biggest fish of the year, pre-spawn. Fall is when numbers pick up — an easy, forgiving season good for beginners and families. Winter (December–March) is quiet but rewards patience with a shot at a genuine trophy in deep water.
Roughly April through August, peaking May–July, fished with a long pole and simple sabiki rig from shore.
Getting there & rules
No license is needed for bass fishing — Biwa is legally classified as a "sea district" with no established fishing rights, so shore fishing is open to anyone. Bass boat rental is easy to find around the lake. The shallow south basin (avg. depth around 4 m) and the deep north basin (around 43 m) fish quite differently, so it's worth knowing which side you're on before you start. See the full Lake Biwa guide for both basins, seasons, and boat rental.
Lake Kasumigaura (Ibaraki)
What's in the water
Largemouth bass again, though this is known as a more technical, sometimes stingy lake compared to Biwa — part of why serious anglers rate it. Also channel catfish, pond smelt, crucian carp, and gobies. Ayu from the rivers feeding the lake are a well-known local grilled dish.
Best season
Spring and fall are the two recommended windows — spring for pre-spawn fish, fall for numbers. Some local guides point specifically to September. Summer fishing is possible but hot and humid.
Getting there & rules
Same as Biwa — no license is required to fish from shore. Shoreline fishing is popular with locals; boat rental ("leisure boats") clusters on the western side of the lake. If you visit between late July and mid-October, the historic sail-powered Hobikibune boats operate as a (non-fishing) tourist attraction worth seeing between casts. See the full Lake Kasumigaura guide for where the bass hold and how the rules differ from Biwa.
Lake Saroma (Hokkaido)
What's in the water
This one is genuinely different. Two narrow gaps in a 20km sandbar connect the lake directly to the Sea of Okhotsk, so the water is close to full seawater salinity. Scallop and oyster farming — run by local fishery cooperatives — is the lake's real business. Anglers fish the ports around the lake mouths for chum and pink salmon, herring, flatfish, and smelt. Bass are not part of the picture here.
Best season
Follows Hokkaido's autumn run — roughly September through late November, best in the early morning.
Continues into winter, sometimes fished through the ice once the shallows freeze.
Getting there & rules
Much of the lake is working aquaculture water, so stick to public shoreline and river-mouth areas rather than the scallop rafts. A local fishery cooperative office or lakeside shop is the best source for what's currently allowed and biting — don't assume the same open-access rules as Biwa or Kasumigaura apply here. See the full Lake Saroma guide for seasons, ports, and the shellfish rule.
Lake Ogawara (Aomori)
What's in the water
Another brackish lake, connected to the Pacific by the Takase River. Ogawara lands more wakasagi (pond smelt) and shirauo (icefish) than any other lake in Japan, and its shijimi clams are just as famous — locals call it the "treasure lake." Also mitten crab, eel, and crucian carp. See the full Lake Ogawara guide for ice fishing, permits, and summer clam gathering.
Best season
Roughly December through February — the lake's marquee season. The Ane-numa inlet is a well-known, easy spot: shallow, calm, and often set up with pre-drilled holes and rental gear for beginners.
Getting there & rules
Outside winter, the lake sees general summer fishing alongside swimming and kayaking, though wakasagi season is the specific reason most people make the trip. Guided smelt tours provide all equipment, which is the easiest way in if you don't already own ice-fishing gear.
Lake Inawashiro (Fukushima)
What's in the water
Once Japan's largest acidic lake (around pH 5), Inawashiro was crystal clear and short on fish — dace and crucian carp were most of the story. Since the mid-1990s the water has turned close to neutral, and the lake has become far more productive: it's now known for big smallmouth bass (including a 2025 Japan record), large iwana and yamame trout, and plenty of wakasagi. It's still very clear — nicknamed "Tenkyo-ko," the Mirror of Heaven, for how sharply it reflects Mount Bandai on a calm day.
Best season
Smallmouth fish best from May to November, peaking in spring and autumn; iwana and yamame are open April through September. The lake itself is too big and deep to freeze for ice fishing.
Getting there & rules
Permit required from the local cooperative, and night fishing is banned. Marinas and guides on the south and west shores cover the deep water where the biggest fish live. See the full Lake Inawashiro guide for permits, spots, and seasons.
Lake Suwa (Nagano)
What's in the water
Wakasagi is essentially the whole story here — fished not through a hole cut in the ice, but from inside a heated "dome boat" floating on the lake. It's an unusual, genuinely family-friendly way to fish straight through winter.
Best season
Roughly October into March, with December to mid-February the most popular stretch. Catching over 100 fish in two hours isn't unusual on a good day. In especially cold years, the lake freezes solid and produces omiwatari — a rare ice-ridge phenomenon tied to local legend, though it's become less reliable as winters warm.
Getting there & rules
Dome boat operators provide all gear, so no equipment of your own is needed. Trips can be booked through lakeside inns, sightseeing boat operators, or pleasure-boat companies around the lake. See the full Lake Suwa guide for prices, the permit, and the state of the wakasagi stock.
Made by us
TsureruKana
We also build an app that tracks major and minor feeding windows — with a confidence score — for each of these six lakes, plus a lure-matching suggestion for what's likely working right now.
iPhone version coming soon · See everything the app does