Net cage aquaculture (net cage aquaculture)

Japanese: 網いけす養殖(網生簀養殖) - あみいけすようしょく（英語表記）net‐cage culture

This is a method of farming in which the water surface is partitioned with nets. Currently, most marine fish such as yellowtail and sea bream are farmed using this method, and it is also called small-area farming. It is not only done in the sea, but also in lakes and marshes, such as carp farming in Lake Suwa and Lake Kasumigaura, and net cages are also used to raise young fish in fish ponds. Synthetic fiber nets are usually used for net cages. Wire mesh may be used for fish with strong teeth such as pufferfish and stone bream. The traditional method was to attach the net to a bamboo or log frame and float it on the water surface directly or with floats such as drums or barrels, but recently a method using polystyrene foam floats on a steel frame with a scaffold for feeding and hauling has become popular.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

水面を網で区切って行う養殖方法の一つで，ハマチやタイなど海産魚類の養殖の多くが現在この方法で行われており，小割養殖とも呼ばれている。海ばかりでなく，諏訪湖や霞ヶ浦のコイの養殖のように湖沼でも行われており，また養魚池の中で稚魚を育てる時などにも網いけすが利用される。　網いけすにはふつう合成繊維の網が使われる。フグやイシダイなど歯の強いものには，金網が使われることもある。竹や丸太の枠に網を取りつけ，直接あるいはドラム缶や樽などの浮きで水面に浮かべるのが従来の方法であったが，最近は投餌や取揚げなどの作業の足場を備えた鋼鉄製の枠に発泡スチロール製の浮きを使う方式が普及してきた。

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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