Ongai (Sea mussel) - Ongai

Japanese: オンガイ(イケチョウガイ) - おんがい
Ongai (Sea mussel) - Ongai

...The name Karasu-gai comes from its color. In the Lake Biwa area, the thick-shelled Ikechogai (illustration), which is the mother shell for freshwater pearl cultivation, is called Ongai, while this thin-shelled species is called Mengai and is considered to be male and female. Also, when young, the shell has a flat plate-like protrusion on its back, but this is lost as it grows. ...

*Some of the terminology that refers to "Ongai (Ikechōgai)" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…その色からカラスガイの名がついた。琵琶湖地方では淡水真珠養殖の母貝となる殻の厚いイケチョウガイ(イラスト)をオンガイというのに対して,殻の薄いこの種をメンガイと呼んで,雌雄と考えていた。また,幼貝のときは背上に平たい板状の突起があるが,これも成長すると失われる。…

※「オンガイ(イケチョウガイ)」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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