Like Sea Breams, there are many different Emperors. They look a lot like 
Snappers, and are closely related, the difference being Emperors are species from 
the family Lethrinidae and Snappers are from the family Lutjanidae. Just to further 
confuse, there is a fish called Emperor Snapper although it is a member of the 
Lutjanidae family. Ranging from 300g to 1kg,varieties of Emperor include 
Longnose, Snubnose, Spangled (also known as Capitaine or Blue Emperor), and 
Yellowtail. 
When it comes to the flesh and cooking, while Emperor doesn’t have quite as 
strong a flavour as Snappers, it can be cooked in the same way.