Ayu, or sweetfish, is a prized seasonal delicacy in Nara Prefecture. The clear rivers of the Yoshino region, including the Yoshino River and the Asuka River, have long been associated with this distinctive fish. Wild ayu grow in clean, flowing water, feeding on algae attached to riverbed stones. Their delicate fragrance and refined flavor make them a favorite ingredient in traditional Japanese cuisine.
The Japanese character for ayu, 鮎, combines the fish radical with a character associated with divination. According to tradition, people in ancient times used the fish for fortune-telling. Ayu is also written as 香魚, meaning “fragrant fish,” because its fresh aroma is often compared to that of watermelon or cucumber. Since the fish completes its life cycle in approximately one year, it is also known as 年魚, or “annual fish.”
One of the most popular preparations is salt-grilled ayu. The fish is grilled whole, usually without removing the innards, allowing its natural flavor to develop. It is commonly eaten hot with tade-zu, a tangy sauce made with Japanese water pepper that complements the fish’s delicate taste.
Other traditional dishes include ayu gyoden, in which lightly grilled fish is coated with a savory miso paste and grilled again; whole-fish sushi; sweet soy-simmered ayu known as kanroni; and uruka, a distinctive fermented or salted delicacy made from the fish’s innards. These preparations offer different ways to appreciate ayu’s characteristic aroma and flavor.
Ayu sushi is a specialty of the Yoshino River basin. Wild sweetfish raised in the region’s clear streams feed on algae growing on river stones, developing the fresh fragrance that has earned them the name “fragrant fish.” Their distinctive flavor makes them particularly well suited to sushi.
Historically, ayu sushi was made as narezushi, a fermented preparation in which fish and rice were aged together for periods ranging from one week to one month. This method produced a strong, distinctive flavor, but gradually fell out of use as tastes and food practices changed.
During the Muromachi period (1336–1573), improvements in fermentation techniques, including the use of barrels and weights, helped shorten the fermentation process. This led to namanarezushi, a style in which the rice was eaten along with the fish. Modern ayu sushi is generally prepared for immediate consumption rather than prolonged fermentation, allowing the fish’s delicate, refreshing flavor to take center stage.
Ayu sushi from Nara gained wider recognition through Yoshitsune Senbon Zakura, a celebrated story performed in kabuki and traditional puppet theater. The story features a sushi shop that is said to have existed in Nara Prefecture. Its signature dish, tsurube sushi, was traditionally made by packing rice and ayu together and allowing them to ferment.
The name “tsurube” refers to a bucket used to draw water from a well. The sushi container was said to resemble this type of bucket, giving the dish its distinctive name. The restaurant associated with the famous theatrical story continues to operate as a long-established traditional establishment in Nara.
Tsurube Sushi Yasuke is described as the oldest surviving sushi restaurant in Japan, with a history stretching back more than 800 years. It stands near the gently flowing Yoshino River and is known for its traditional ayu cuisine.
The restaurant’s present wooden, three-story building was rebuilt in 1939 (Showa 14). Its striking red-brown walls provide a distinctive contrast to the surrounding greenery. Guests can enjoy courses featuring wild ayu while admiring the garden, experiencing a culinary tradition closely connected to the history and landscape of Yoshino.
Whole ayu sushi is prepared by placing the fish on seasoned sushi rice and pressing it gently with a tightly wrung cloth. It is then cut into bite-sized pieces for serving. Another popular variation is grilled ayu sushi, which uses cooked fish and may be seasoned with Japanese pepper or served with a sauce.
Ayu has traditionally been regarded as an auspicious food and is often served at gatherings and celebratory occasions. It is especially enjoyed during summer and into autumn, when the fish is in season.
June to August
Main area associated with the tradition: Yoshino River basin
Main ingredients for ayu sushi: Sweetfish, rice, vinegar, and other seasonings
From freshly grilled fish to elegant sushi and centuries-old fermented preparations, ayu offers a flavorful introduction to the culinary heritage of Nara’s mountain rivers. For visitors exploring Yoshino, tasting this seasonal specialty is a memorable way to experience the region’s relationship with its natural environment and traditional food culture.