Cladocera, also known as "Megacephala", belongs to Arthropoda, Crustacea and Cladocera in animal taxonomy. Its shape is very similar to that of lobsters living in the ocean, so it is called "freshwater lobster". At present, there are four kinds of crayfish in China, and the crayfish in the northeast live in unpolluted mountains and streams, which are delicious! Far from the crayfish sewage purification imported from Japan! ! Fourthly, they are called Dracula Creson, and they are distributed in the fresh water area south of the Yangtze River. Their meat is edible.