Caviar Types and Origins

Caviar has no legal definition that applies worldwide, which means a jar labeled "caviar" in one country may contain something entirely different from what a Russian fisherman in the 1800s would have recognized. The word, properly used in the fine-dining and trade context, refers exclusively to the salted, cured roe — the unfertilized eggs — of sturgeon, family Acipenseridae.

Sturgeon eggs are prized for a specific biological reason: the egg membrane is unusually thin and yields cleanly under pressure, releasing a burst of fat-soluble flavor compounds — primarily amino acids and volatile aldehydes — that no other fish egg replicates in the same profile. The fat content of the yolk also carries a distinctly briny, oceanic depth that intensifies with controlled curing.

The curing process is called malossol — from the Russian for "little salt" — and it defines quality caviar. A true malossol product uses no more than five percent salt by weight, which preserves the egg without masking its native flavor. Higher salt concentrations, used in cheaper or older product, extend shelf life but flatten the taste profile considerably.

Quality is assessed on four axes: bead size, membrane integrity, color uniformity, and aroma. Beluga sturgeon (Huso huso) produces the largest beads, sometimes exceeding four millimeters in diameter, while Sevruga (Acipenser stellatus) produces the smallest — under two millimeters — with a sharper, more mineral character. The species determines the ceiling; the curing determines whether that ceiling is reached.

A fish can carry genetically superior roe and still yield mediocre caviar if the eggs are processed after the optimal maturation window, which is why harvest timing is as consequential as species selection.