Seki Aji is a premium brand of Japanese horse mackerel caught in the waters around Saganoseki in Oita Prefecture. The fishing grounds lie in the Bungo Channel, between Kyushu and Shikoku, in an area known as Hayasui-no-Seto.
The currents in this narrow stretch of sea are exceptionally fast and powerful. Horse mackerel that grow in these turbulent waters develop firm bodies and a distinctive texture. The fish are caught individually by members of the Saganoseki branch of the Oita Prefectural Fisheries Cooperative using the traditional single-line fishing method.
Only horse mackerel caught in this way in the designated waters are known as Seki Aji. The name represents a premium seafood product closely associated with the fishing traditions of Saganoseki.
The special marine environment of Hayasui-no-Seto helps produce large horse mackerel with a pleasant amount of fat. Despite their rich flavor, the fish have tightly textured flesh and a satisfying firmness.
This balance is one of the main attractions of Seki Aji. The moderate richness of the fat complements the firm texture, allowing the natural flavor of the fish to stand out.
Seki Aji is caught using single-line fishing, or ippon-zuri. This method allows fishermen to catch the fish individually rather than using methods that may damage them in large quantities.
The careful fishing method is an important part of the product’s identity and helps maintain the quality of the fish. It is combined with strict handling procedures after the catch to preserve freshness.
The quality of Seki Aji is maintained through a distinctive local trading method known as men-gai. This special purchasing system is part of the local approach to handling and marketing the fish.
Freshness is also carefully managed through ikejime, a technique used immediately after the fish is caught. Together, these practices help preserve the quality and flavor of the horse mackerel until it reaches consumers.
Seki Aji is prized for its combination of moderate fat, large size, and firm flesh. The fast currents of Hayasui-no-Seto, the skill of local fishermen, and the careful handling of each fish all contribute to its distinctive quality.
For visitors to Oita Prefecture, Seki Aji is an excellent example of the region’s rich seafood culture. Its natural flavor and firm texture make it a particularly appealing choice for those who wish to enjoy premium Japanese horse mackerel.