Beluga Caviar 000 is the most appreciated of sturgeon caviars. Its eggs are obtained from wild Caspian Sea sturgeon, specifically the Time-zone species, also known as Beluga sturgeon. Esturion: Wild Beluga (Huso-spindle) Hometown: The Caspian Sea Size of eggs: Very large (2. 5 to 3. 5 mm) Color: Light-gray tones to dark gray.