It’s a great question! I thought the definition included both mollusks and crustaceans... but nothing with fins.This may sound like a silly question but what is included in the term 'shellfish'? I had not thought of prawns (shrimp) and lobster as shellfish but I think in culinary terms they are included?
Would crayfish be included?
Thanks for the info Iceman . Is squid included even though it doesn't have an external shell? I've seen definitions of 'shellfish' which include squid. Crayfish is a crustacean so maybe its included? Although... they are freshwater not sea. Well I'll post my crayfish salad anyway. If it doesn't qualify it doesn't matter.and most kinds have an external calcareous shell.
Squid is a mollusk... like octopus, who doesn’t have an external shell either. Is confusing, huh. Some shellfish have no shells and none are fish.