The Procambarus clarkii, also known as the red crayfish, freshwater crayfish, or red swamp crayfish, is a species of crayfish in the family Crayfidae. It is native to the southeastern United States and northern Mexico, and is now widely distributed in more than 40 countries and regions. It is also widely present in various parts of China, especially in the middle and lower reaches of the Yangtze River where the population is the largest. This kind of shrimp often lives in rivers, lakes, ditches, ponds and rice fields. In scientific classification, it belongs to the animal kingdom, arthropod phylum, crustacean subphylum, soft shelled class, Decapoda, abdominal embryo subphylum, crayfish family, and genus Procambarus. The scientific name of this shrimp was first named by Girard in 1852.

The Japanese black crayfish is a species of crayfish in the genus Crayfish, native to northern Japan. It is a small crayfish with a body length of generally 50-60mm and a gray shell. Due to the threat posed by the invasive species of Procambarus clarkii from the United States, the Japanese Ministry of Environment has listed it as a vulnerable species. Omnivorous animals that feed on algae, red worms, aquatic insects, and aquatic scavengers in water. It is a freshwater vulnerable species in Japan.

Lobster is a general term for animals in the family Lobidae, also known as dragon head shrimp, shrimp queen, sea shrimp, or shrimp king. The shell is firm and thick, often with thorns on the surface; The body is roughly cylindrical in shape, with a slightly flat back and abdomen; The head and chest armor are well-developed, thick and spiny, with a pair of powerful ocular spines in the center of the anterior edge, but without frontal horns; The abdomen is short and thick, curled towards the ventral surface at the back, and the tail fan is wide and short. Named after its appearance resembling a mythical dragon in daily life.