Ground-seeding aquaculture (ground-seeding aquaculture)

Japanese: 地まき式養殖(地蒔式養殖) - じまきしきようしょく

This is an extensive aquaculture method in which young shellfish (seedlings) such as clams, oysters, and scallops are spread in a certain area of shallow water, grown on natural feed, and harvested. There are two methods of spreading: the tidal spreading method, in which seedlings are spread from a boat at high tide, and the tidal flats method, in which seedlings are spread on tidal flats at low tide. In the case of clams, seedlings with shell lengths of about 2 cm are spread in spring or autumn at about 12 to 36 liters per 10 m2 of aquaculture area, and the ones that have grown to 3.5 to 4 cm are harvested six months to a year later, from autumn to spring. In the case of clams, seedlings with shell lengths of about 2 cm are spread in April or May in calm waters with a depth of 1 to 4 m at a rate of 11 to 27 liters per 10 m2.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

アサリ，ハマグリ，カキ，ホタテガイなどの稚貝(種苗)を一定区画の浅海にまきつけ，天然餌料で成長させ収獲する粗放的な養殖法。まきつけ方には満潮時に船の上からまきつける潮まき法と干潮時に干潟にまきつける潟まき法とがある。　アサリの場合は殻長2cm前後の種苗を春または秋に養殖区域10m2あたり12～36l前後まきつけ，6ヵ月から1年後の秋から春にかけて3.5～4cmに育ったものを収獲する。ハマグリの場合は4～5月ごろに，殻長2cm前後の種苗を水深1～4mの波静かな水域に，10m2あたり11～27lまきつける。

出典　株式会社平凡社世界大百科事典第２版について　情報

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