Fudoki Japan

Funazushi

funazushinigorobunafermentedLake Biwanarezushi
Funazushi — location in Shiga, Omihachiman

Shiga · Omihachiman

35.1507°N, 136.1201°E

Funazushi is what sushi was before it involved vinegar or raw fish. Nigorobuna, a carp found only in Lake Biwa, is caught in spring, salted for months, then packed in cooked rice in summer and left to ferment under a weight until winter. The rice is discarded and the fish is eaten in thin slices — sour, salty, dense, with soft bones and a smell that arrives before the plate does.

It is the oldest continuously made form of sushi in Japan and it is an acquired taste even for Japanese visitors. Shiga treats it as a delicacy and a new year food, served in slices with sake or poured over with hot tea. Producers cluster around the eastern shore, several of them farming nigorobuna themselves because the wild population collapsed, and most sell whole fish or vacuum-packed slices to take away.

Essential Information

Opening Hours

Varies by producer and shop — confirm before travelling

Closed: Varies by producer and shop

Entrance Fee

Whole fermented fish and sliced vacuum packs are priced by grade and by whether the fish is wild or farmed — confirm with the producer

Best Season

January–March, when the batch fermented from the previous summer reaches its intended point

Visit Duration

1 hour for a tasting and a shop visit

Getting There

Access Information

Producers and shops are spread along the eastern shore of Lake Biwa, with several around Azuchi in Omihachiman City and others in Takashima, Nagahama and Otsu. Whole fermented fish and pre-sliced vacuum packs are sold at specialist makers, at department store food halls in Otsu and Kyoto and at roadside stations around the lake. Prices vary widely by grade and by whether the fish is wild or farmed — confirm with the producer. Many makers also serve it by the plate in an attached restaurant.

Insider Guide

Premium
**Start with a few slices, not a whole fish.** A whole funazushi is a serious purchase and an even more serious commitment if you find you dislike it. Vacuum packs of a few slices are sold everywhere. **Ask for the roe.** Female fish carry a dense orange roe that fills the belly cavity, and that is the part connoisseurs pay for. It is milder than the flesh. **Farmed nigorobuna is the norm now.** The wild Lake Biwa population fell far enough that producers began farming their own. Makers will tell you which they use, and wild fish costs several times more. **Ochazuke is the beginner's route.** Slices in a bowl with hot green tea poured over rice softens everything about it, and it is how many Shiga households actually eat it. **It is a new year food.** Fermented from summer, ready around January, so late winter is when the year's batch is at its intended point. **The smell is not spoilage.** Lactic fermentation over months. If that sounds like a warning, it is meant as one, and trying it in a restaurant before buying is the sensible order.

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