Caviar is the eggs of sturgeon and it is also one of the most beneficial and expensive foods. Traditionally, the term caviar refers only to roe from wild sturgeon in the Caspian Sea and Black Sea.
The main sturgeon fishes are Huso Huso (Beluga), Acipenser persicus (Persian sturgeon), Acipenser gueldenstaedtii (Russian sturgeon) and Acipenser stellatus (Sevruga).
Beluga is one the biggest bony fishes which is found in the Caspian Sea and Black Sea basins. Depending on the species, a sturgeon could take from five to eighteen years to produce caviar.