Lake Hamana nori

Lake Hamana in Shizuoka is a brackish lake, so the place behind Hamanako nori is a water body where fresh and seawater mix. The name is tied to Hamana Fishery Cooperative nori growers and to cultivation and harvest within designated fishing areas of the lake. That boundary keeps the name attached to lake plots, grower members, and work on the water.

About 99% of the nori harvested in Lake Hamana is hitoegusa, a green alga. That material explains the bright green color, seaside aroma, and smooth texture associated with Hamanako nori. It also explains the range of uses: fresh nori, tsukudani, furikake, soups, and vinegared dishes all give hitoegusa a clear place at the table.

Cultivation in Lake Hamana is said to have begun around Bunsei 3, or 1820, with permission from the Nakaisumi magistrate’s office in Bunsei 6. The remembered beginning names Moritaya Hikonojo and Omori Sanjiro, who noticed nori growing on stonework in Maisaka-shuku, tried cultivating it, and found that it took well and had good flavor.

The present workflow starts at Lake Hamana’s cultivation grounds, where nori grows on nori nets. After growth on the nets, it is harvested with a suction machine, then taken to a factory for washing, removal of foreign matter, and processing into forms such as sheet nori. General nori aquaculture also uses steps such as seeding, nursery growth, main cultivation, harvest, washing, removal of foreign matter, and drying, which helps frame the technical rhythm behind the net work.

Hamanako nori is described through three sensory details: a seaside aroma, a smooth mouthfeel, and a vivid color. In miso soup or vinegared dishes, fresh nori brings that aroma close to steam and acidity. In tsukudani or furikake, hitoegusa’s softness and green color become the recognizable traces of the lake’s algae.

Around 1887, nori workers in Maisaka built a memorial stone for Moritaya Hikonojo; the stone was later moved to Hojuin, and the current memorial was built in 1925. A memorial festival began in 1935, and since 1967 it has been held on February 6, Nori Day. The date connects Maisaka names, a temple stone, and the work of raising nori on Lake Hamana.