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.