also: えらぶくろ
noun
gill sac; branchial sac; pharyngeal pouch
Anatomical term for a gill-related sac or pouch in aquatic organisms; used in zoology and biology.
魚の発生過程で鰓嚢が形成される。
Gill sacs form during the development of fish.
この種の鰓嚢の構造は呼吸に適している。
The structure of the gill sac in this species is suited for respiration.
鰓 (えら) is the general term for gills, while 鰓嚢 specifically refers to the sac or pouch structure.
Compound of 鰓 (sai, 'gill') and 嚢 (nō, 'sac, pouch'). The reading えらぶくろ is the native Japanese reading of the same kanji.