noun
kaluga; river beluga
A large sturgeon species native to the Amur River basin. Scientific name: Huso dauricus.
ダウリアチョウザメはアムール川に生息する巨大な淡水魚だ。
The kaluga is a giant freshwater fish that lives in the Amur River.
From Russian даурия (Dauria, a historical region) + 蝶鮫 (ちょうざめ, sturgeon). The exact derivation is uncertain; the name reflects the species' geographic range.