Ikema

Japanese: 活間 - いけま
Ikema

...Recently, forced water changes (4-6 times per hour) have been made possible using pumps, which has improved the breeding environment and the functionality of the boat, as water exchange holes in the bottom of the boat are no longer necessary. Boat ponds are often called ikema or kame (pots). Traditionally, the word "pond" conjured up small ponds for keeping fish for a relatively short period of time, but in recent years there are also large ponds used for aquaculture.

*Some of the terminology that refers to "Katsuma" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…最近はポンプを使って強制換水(1時間に4~6回)するようになり,飼育環境の面でも,また船底の換水孔が不要になったため船の機能の面でも改善された。なお船のいけすのことを活間(いけま)とかかめ(甕)とか呼ぶことも多い。 従来はいけすというと比較的短期間飼っておく小規模のものが想起されたが,近年は養殖に用いられる大規模ないけすもある。…

※「活間」について言及している用語解説の一部を掲載しています。

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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