Since last summer, crayfish have been rapidly breeding in Berlins tigel Garden Park. According to German regulations, it is forbidden to catch and roast these crayfish. But now faced with the threatening crayfish, the Berlin municipal government has started encouraging people to eat them. Dirk Ellert, an official of the environmental protection department of Berlin, said the study showed that the freshwater crayfish, which was native to the southern United States and Northern Mexico, could be assured to eat, and the municipal government had given permission to a local farm to allow the latter to catch small lobsters at two parks in Berlin for sale to restaurants and ordinary customers. Ellert said that at present, about 4000 have been captured. However, the Berlin municipal government still does not allow ordinary citizens to catch lobster privately. Crayfish can be competitive in the local ecological environment because of its omnivorous, fast growing and adaptive ability. Last August, the Tien gten District, Berlin, began to appear on the streets of crayfish, the most intensive in front of the Spanish Embassy in Germany, and the amount of social media attention. The local fisheries department says Till Gartens water quality is good, which means that crayfish may migrate to expand breeding.