Seki-Aji and Seki-Saba — The Pinnacle of Brand Fish Raised by the Bungo Channel

Seki-aji (horse mackerel) and seki-saba (mackerel), raised buffeted by the fierce tidal currents of the Bungo Channel, are high-grade fish praised as the pinnacle of fish brands for their firm flesh and rich umami. Only the horse mackerel and mackerel line-caught at Saganoseki in Oita City, and carefully ike-jime (live-killed) so as not to damage them, are permitted to bear this proud name. Their quality is guaranteed, and they are prized even at high-end sushi restaurants and traditional Japanese restaurants in Tokyo.

Why So Delicious

The Hayasui Strait (Hoyo Strait) off Saganoseki is one of Japan's foremost rapid-current zones, where the seawater of the Seto Inland Sea and the tidal currents of the Pacific Ocean collide. As the fish keep swimming year-round in the complex, fast tidal currents, the flesh tightens up muscularly, and a moderate amount of fat and concentrated umami are born. Furthermore, since plankton and small fish that serve as food are abundant, they grow into superb, plump fish. The fishermen are also known for a unique trading method called tsuragai, which does not give the fish stress.

Where to Eat

The standard places are kappo and sushi restaurants in Oita City, Saganoseki, and the castle town of Usuki. Savoring them as ultra-fresh sashimi is the royal road, and the firm, springy bite and the elegant sweetness that spreads the more you chew are exceptional. Seki-saba can also be enjoyed as seki-saba sushi or gomadashi. At the roadside station and other places in Saganoseki, you can taste dishes using fish just landed, and the location overlooking Beppu Bay and the Hoyo Strait is also a charm. Together with the view stretching from the Kunisaki Peninsula to Shikoku, you can also taste the vitality unique to a fishing port.

Best Season

Seki-aji is said to be in season in spring to summer when it carries fat, and seki-saba in autumn to winter when the flesh tightens and it is also richly fatted. That they are reliably delicious year-round is also the reason they are brand fish raised by the rapid currents. However, for eating seki-saba raw, care is taken in handling even at shops dealing in wild fish, so savoring it at a specialty shop with thorough freshness management is reassuring. In the mild-climate seasons, a seaside drive of the Saganoseki Peninsula is also refreshing.

Access and Basic Information

Saganoseki is located at the eastern edge of Oita City, and heading toward Saganoseki by Oita Bus from in front of JR Oita Station takes about one hour. By car, a guide is about 30 to 40 minutes from central Oita City via National Route 197. Saganoseki is also the departure point of a ferry connecting to Misaki Port in Ehime Prefecture on Shikoku, so it can be built into an itinerary from Shikoku. It is also close to Beppu Onsen, and seki-aji and seki-saba are often served at hotels and inns within Oita City and Beppu, so savoring them together with a hot-spring stay is also recommended.

Practical Travel Notes

• Recommended time of day: Kappo and sushi restaurants are popular at lunchtime, and on holidays you may have to wait. If you want to savor them calmly, make a reservation in advance at shops that accept them, or aim for the time right after opening.
• Budget sense: Being brand fish, sashimi and set meals are in a somewhat higher price range, but a bowl or set-meal style is relatively affordable, and a course lavishly savoring a fish of the season has a satisfaction fit for a special meal.
• Nearby real spots: At the tip of the Saganoseki Peninsula are the Sekizaki Kaiseikan observatory and the Saganoseki Lighthouse, where you can enjoy scenery overlooking the Hoyo Strait. Setting it as a set with a seaside drive lets you fully enjoy both taste and scenery.
• Tip for choosing: Only fish line-caught and ike-jime at Saganoseki can bear the names seki-aji and seki-saba. Choosing a shop that displays the brand, or items clearly marked as Saganoseki-produced, lets you meet the authentic taste.

A Word of Advice

Since seki-aji and seki-saba are wild fish, whether they are served can change depending on that day's landing situation. If you want to be sure to savor them, inquiring with the shop in advance is reassuring. If you eat and compare horse mackerel and mackerel according to the season and your preference, you can fully relish the true ability of the brand fish raised by the Bungo Channel.

📚 Sources

For information on Seki-aji and Seki-saba, the main references are the public information of the Oita Prefectural Fisheries Cooperative that covers Saganoseki and the sightseeing information for Saganoseki provided by the Oita City Tourism Association. The conditions for using the Seki-aji and Seki-saba names (line-caught and live-prepared at Saganoseki) and nearby facilities such as Michi-no-Eki Saganoseki and the Sekizaki Kaiseikan can be traced through such public and regional guidance. Each shop's hours and availability, and ferry services, may change, so please confirm the latest details with each shop and through official sources before you visit.

Visitor Checklist

• Estimated time: Centered on a meal at a kappo or sushi restaurant and combined with the scenic spots of the Saganoseki peninsula, allow about half a day.
• What to bring: As branded fish, sashimi and set meals are somewhat pricey; rice-bowl or set-meal styles are more affordable, so prepare a budget to match, and since popular shops may have a wait at lunch, reserve ahead where possible.
• Suggested route: After enjoying Seki-aji and Seki-saba at Saganoseki, tour the Sekizaki Kaiseikan, Saganoseki Lighthouse, and Michi-no-Eki Saganoseki mentioned in the article, combining a coastal drive with views of the Hoyo Strait.
• Note: As wild-caught fish, availability can change with the day's catch, so contact the shop in advance if you want to be sure.