crayfish means: Also known as “crawdads” or “crawfish”. Crayfish, freshwater crustaceans similar to tiny lobsters, are freshwater crustaceans. You can prepare crayfish in the same way as a lobster. (in Cooking Dictionary)

What else does crayfish mean?

One of several freshwater crustaceans belonging to the Northern Hemisphere families Astacidae or Cambaridae, and Parastacidae in the Southern Hemisphere. It resembles a lobster but is much smaller. (in Merlin Dictionary)