CATDOLL : CATDOLL: Where is the origin of crayfish? Where is the origin of crayfish?

1. Crayfish is native to the United States, so it is also called American crayfish;

2. It was introduced to Japan in 1918 as bait for raising bullfrogs, and began to multiply in Nanjing City and its suburban counties in Jiangsu Province. After a long period of expansion, the population continued to increase and the living space continued to expand. At present, crayfish has expanded to Anhui, Shanghai, Jiangsu, Hong Kong, Taiwan and other places, forming a large natural population and becoming an important resource of freshwater shrimp in my country.