Saku carp

Saku carp begins with water rather than the sea. The upper Chikuma River system, its tributaries, irrigation channels, and underflow water support ponds and rice fields in a basin about 500 to 700 meters above sea level. Good water quality, abundant oxygen, low water temperature, and large daily and seasonal temperature swings are linked in the local accounts with flesh that tightens as the fish grows. The result readers meet at the table is a firm texture and a clean taste with little muddy odor.

The rearing path gives Saku carp its pace. In the tourism-board account, parent carp spawn in mid-May; once fry reach about 1 to 3 grams, they are raised in reservoir ponds. By November of the same year, the young carp weigh about 50 to 100 grams, then move to ponds for overwintering. Shipment commonly comes in the third year, when the fish weigh about 1 to 1.5 kilograms. Cold running water slows growth, and that time is tied to firm flesh, moderate fat, and reduced odor.

Saku’s carp raising was once close to ordinary farm work. The educational study describes rice-field and pond aquaculture as part of a local system in which edible carp could be raised beside rice cultivation; by the Meiji period, places such as Nakagomi, Nozawa, and Hara used rice fields for commercial carp production. Later agricultural modernization and changing eating habits separated producers from household consumers, and specialized inland aquaculture producers took on a larger role. Recent rice-field carp efforts connected with pesticide-free rice bring the fish back into fields where rice and water once framed the work together.

The name Saku-goi gathered several local memories into one regional name. One account preserves a village memory of wild carp rearing in Nakagomi; another describes Usuda Tan’uemon bringing Yodo carp to Sakurai, with carp raising later taking root around Nozawa. Earlier market names included Nakagomi carp, Sakurai carp, and Nozawa carp, before the shared name Saku-goi settled around 1930. Later regional collective trademark status gives context for that shared name, but the living meaning is concrete: a fish tied to Saku’s water, place names, and producer community.

The clearest way to understand Saku carp is through the dishes that carry its texture. Koi-koku simmers cross-cut carp in Shinshu miso soup, with seasonings varying by household. Arai uses live carp sliced and chilled in cold water until the flesh curls, then served with wasabi soy sauce or vinegar miso. Uma-ni, kanro-ni, salt-grilling, and suzume-yaki show other ways local cooks handle the same fish. In the Saku region, carp also remains a year-end food custom, and the educational study notes especially strong December demand.

After the period of rapid economic growth, fewer households cooked carp at home, and the distance between aquaculture producers and consumers widened. The educational study also describes KHV disease as a production shock. Continuity in Saku has therefore depended on practical activity rather than nostalgia alone: civic groups renewed attention to carp cuisine, school learning and rice-field aquaculture connected children with fields and local meals, and the Saku Aquaculture Cooperative works in freshwater fish farming, product development, and research. When Saku carp moves from a cold pond to koi-koku or arai, it carries the basin’s water, the old rice-field setting, and the work of specialized producers.