Migratory flock - Kaiyugun

…As mentioned above, they migrate along the coast and offshore, but there are also groups that do not move much, and their morphology, body color, and ecology differ. The migratory group, which is more abundant, has a dark black back and is called Kuroaji, and has a low body height. The group that is attached to the coast is called Kiaji, has a light yellowish brown back with dark spots developed near the lateral line, and is taller than Kuroaji. …

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…先に述べたように沿岸，沖合を回遊するが，あまり動かない瀬付き群もあり，形態，体色，生態が異なる。量的に多い回遊群は体の背部が暗黒色でクロアジと呼ばれ体高が低い。瀬付き群はキアジと呼ばれ，背部が淡い黄褐色で暗色の斑模様が側線近くに発達し，クロアジより体高が高い。…

※「回遊群」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