noun
beluga sturgeon; European sturgeon; Huso huso
Refers specifically to the beluga sturgeon (Huso huso), a large species of sturgeon known for its caviar.
オオチョウザメは世界最大の淡水魚の一つです。
The beluga sturgeon is one of the largest freshwater fish in the world.
オオチョウザメの卵は高級キャビアとして珍重される。
The eggs of the beluga sturgeon are prized as high-grade caviar.
チョウザメ is the general term for sturgeon, while オオチョウザメ specifies the beluga sturgeon species.
Compound of 大 (おお, 'large') + 蝶鮫 (ちょうざめ, 'sturgeon'). The reading ちょうざめ is a combination of 蝶 (ちょう, 'butterfly') and 鮫 (さめ, 'shark'), likely referring to the fish's shape.