Domestic crayfish mainly eat plants, but small fish, shrimps, plankton, benthos and algae can all be used as their food, and they also kill each other when food is scarce. Crayfish is also called Procambarus clarkii, red crayfish, freshwater crayfish, etc.

Crayfish is omnivorous. In the wild natural environment, it basically eats organic debris, epiphytic algae, filamentous algae, roots, leaves and fragments of aquatic plants, and especially likes green plants with rich juice, such as water hyacinth, water hyacinth, POTAMOGETON malayi, green duckweed and bitter grass. Animal food includes water earthworm, earthworm, eggs from aquatic insects, pupae, snails, mussels and fish.