Illex argentinus which is the biggest in terms of volume, value and also size of the squid. Typical annual catches are around 150,000 tonnes with much of the catch destined for the Far East although significant amounts also go to Europe; the Loligo gahi are caught by large stern trawlers almost all of which are registered in the Falkland.
So I am starting a thread for you to post links to pictures of marine invertebrate inspired coins and stamps. As they come in I will add them to the post! While we are at it let’s do another post for oceanographic equipment (vessels, expeditions, submersibles, etc.).