Caviar is a food consisting of salt-cured roe of the family Acipenseridae.
Caviar is considered a delicacy and is eaten as a garnish or a spread.
Traditionally, the term caviar refers only to roe from wild sturgeon in the Caspian Sea and Black Sea (Beluga, Ossetra and Sevruga caviars).
The term caviar can also describe the roe of other species of sturgeon or other fish such as salmon, steelhead, trout, lumpfish, whitefish,[3] or carp.
The roe can be “fresh” (non-pasteurized) or pasteurized, with pasteurization reducing its culinary and economic value.
https://en.wikipedia.org/wiki/Caviar
キャビアは、チョウザメの卵巣をほぐしたものの塩漬け。オードブルなどで供される高級食材
https://ja.wikipedia.org/wiki/%E3%82%AD%E3%83%A3%E3%83%93%E3%82%A2
Where Does Caviar Come From? Learn All About Caviar
https://caspianmonarque.com/where-does-caviar-come-from/