As a Brit, I am assured by your assertion that the food thee speak of is Crayfish.Your wiki-fu is weak, young padawan.
"Crayfish are eaten in Europe and China. In the United States, they are most popular in the U.S. state of Louisiana, where the standard culinary term is crawfish;" - http://en.wikipedia.org/wiki/Crayfish
May the Force be with you!!
Dave