Isshiki eel

The name Isshiki eel points to a local farming system in Nishio’s Isshiki area, as well as to the finished grilled eel on the plate. Shirasu juveniles are raised in local ponds, with growing conditions, feeding, water quality, and checks before harvest forming part of the routine. Around those ponds, the cooperative structure also handles live-eel sorting and shipment, shirayaki and kabayaki preparation, feed, fuel, and water supply.

Its local character is concrete: ponds in Isshiki, water management, feed work, inspection before harvest, and shared tasks after the eel leaves the pond. By the time an adult eel moves toward live shipment or grilling, it has passed through a sequence of local practices rather than a single finishing step.

Water gives Isshiki eel its strongest sense of place. A dedicated aquaculture water supply introduced in 1963 brought Yahagi River water directly into the ponds and became an important condition for the area’s growth. In the pond, water temperature, water quality, feed, and stocking density are managed together, linking river water, low coastal land, and daily farm work.

The river water does not work alone. It becomes part of a managed pond environment where juvenile eels are watched through temperature, feed, density, and health checks. That combination of natural water and repeated human adjustment is the practical base beneath the soft-skin and rich-fat descriptions associated with Isshiki eel.

The early path begins at Sakata Shinden, where an Aichi fisheries station was set up in 1894, followed by mixed eel rearing in carp ponds in 1898. In 1904, Tokura Rokubei and Tokura Hirokichi opened 12 hectares of private ponds at Chikubu Shinden, giving the local industry a larger business footing.

After the 1959 Isewan Typhoon, recovery measures and rice-field conversion turned coastal farmland into eel ponds. Compound feed, the 1963 water supply, and later heated vinyl-house ponds helped shape the production area. The history of Isshiki eel is visible in named places, changed fields, water infrastructure, and pond technology rather than in a single founding tale.

In the ponds, shirasu juveniles are raised until they become adult eels. The local method manages water temperature, water quality, feed, and density; Nishio City describes a feed based mainly on fishmeal, mixed with water and fish oil, and given morning and evening until the eels reach about 100 grams.

Pond owners harvest adult eels at about 200 to 300 grams, the point where pond work gives way to sorting and shipment. These numbers give the production arc a physical scale: a small shirasu enters the pond, feed and water are adjusted through growth, and the adult eel is lifted when it reaches a handling size for the next stage.

After harvest, eels are sorted by size and quality, then kept in groundwater for several days. This holding step is used to remove harsh flavors and firm the flesh before the eels are packed alive for movement to wholesalers and restaurant kitchens around Japan.

The cooperative’s live-eel sorting and shipment work extends the pond-side labor of Isshiki into the cooking places that receive the fish. Size grading, quality sorting, groundwater holding, and live packing form a bridge between aquaculture and the kitchens where shirayaki or kabayaki may follow.

Preparation gives the pond-raised eel another set of textures. At the cooperative, the eel is split from the back and grilled into shirayaki; for kabayaki, the shirayaki is steamed at about 80 C, then dipped in sauce and grilled four or five times. Shirayaki keeps the eel’s flesh and fat direct, while kabayaki adds steam, fire, and sauce aroma.

The taste descriptions stay close to the farming work: managed water, temperature, feeding, and handling are tied to good-quality fat and soft skin. The summer custom of kabayaki is grounded in these practical steps, from Yahagi River water in the ponds to back-splitting, steaming, and repeated sauce grilling.