Silver-bellied eel - Ginbara eel

Japanese: 銀腹ウナギ - ぎんばらうなぎ
Silver-bellied eel - Ginbara eel

…In any case, eels that have grown sufficiently in the river and begun to mature travel downstream to the sea to spawn in September to November. At this time, the back of the body and the pectoral fins turn deep black, and the underside of the body also shines a dark silver color, so they are called silver-bellied eels. The process that they go through after they leave the sea until they reach the spawning grounds is not known. …

*Some of the terminology that refers to "silver-bellied eel" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…いずれにせよ,川の中で十分に成長し,成熟し始めたウナギは9~11月ころ,産卵のため川を下って海に入る。このときには,体の背面および胸びれは濃黒色となり,腹面も黒みを帯びた銀色に輝いてくるので銀腹(ぎんばら)ウナギと呼ばれる。海に出た後,産卵場に達するまでの過程についてはわかっていない。…

※「銀腹ウナギ」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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