Caviar types
Two universes, kept distinct. True sturgeon caviar, and other fish roe sold as caviar substitutes. Commercial terminology is not always biologically precise; Cavport does not overstate taxonomy where legal or scientific ambiguity exists.
Sturgeon caviar
Other roe & caviar substitutes
Where present, figures are the observed public retail median (9 Nov 2026) for that class. Commercial aliases (for example Oscietra / Ossetra / Osetra) are not a biological guarantee. The Russian grammatical form “осетра” means sturgeon generally and must not be naively mapped to “Oscietra.” Species-specific references require sufficient identity resolution.