There are around 16 types of caviar.
(The four main types of caviar are Beluga, Sterlet, Osetra, and Sevruga.
According to the Guinness World Book of Records, the most expensive caviar, and indeed the world's most expensive food is 'Almas', from the Iranian Beluga fish - 1 kg (2 lb 3 oz) of this 'black gold' can be sold for £20,000 (then $34,500). Almas is produced from the eggs of a rare albino sturgeon between 60-100 years old, which swims in the southern Caspian Sea where there is apparently less pollution.
It's still only fish eggs, aka roe.)
