1. Crayfish inhabit lakes, rivers, reservoirs, swamps, ponds and ditches, and are sometimes found in rice fields, but are more abundant in still water ditches, ponds and shallow grass-type lakes where food is rich.

2. The habitat is mostly soil, especially mud with more humus (with more aquatic plants, tree roots or rocks and other shelters).

3. When the water level of the habitat water body is relatively stable, there are more crayfish. Euryhabiting crayfish have very strong vitality. Under natural conditions, whether in rivers, lakes, reservoirs, ditches, weirs, rice fields, ponds and other environments with sufficient water sources, or in swamps, wetlands and other land with little water, as long as they are not If severely polluted, crayfish can survive and reproduce, forming their own population.

4. Crayfish have high requirements for the water environment and can survive in water bodies with a pH of 5.8~8.2, a temperature of 0~37 feet, and a dissolved oxygen content of not less than 1.5mgL.

Crayfish (scientific name: Procambarus clarkii): also known as Procambarus clarkii, red crayfish and freshwater crayfish. It is shaped like a shrimp and has a hard shell. The adult body is about 5.6~11.9 cm long, dark red, the carapace is almost black, and there is a wedge-shaped stripe on the back of the abdomen. Juvenile shrimps are uniformly gray, sometimes with black ripples. The chelae are long and narrow. The middle part of the carapace is not separated by mesh-like gaps, and the carapace is obviously granular. The forehead sword has side spines or the end of the forehead sword has notches.

It is a freshwater economic shrimp and is widely welcomed by people for its delicious meat. Because of its omnivorous nature, fast growth rate, and strong adaptability, it has formed an absolute competitive advantage in the local ecological environment. Their feeding range includes aquatic plants, algae, aquatic insects, animal carcasses, etc. They will also kill each other when food is scarce. Crayfish has become an important economically cultivated species in China in recent years. During the commercial breeding process, strict precautions should be taken to prevent escape, especially to escape into inaccessible pristine water bodies. It causes destructive harm to the ecological competitive advantage of local species.