- a white sturgeon, Huso huso, of the Black and Caspian seas, valued as a source of caviar and isinglass.
- a cetacean, Delphinapterus leucas, of northern seas, that has a rounded head and is white when adult.
- a large white sturgeon, Acipenser (or Huso) huso, of the Black and Caspian Seas: a source of caviar and isinglass
- another name for white whale
