Origin Procambarus clarkii is native to the southeastern states surrounding the Gulf of Mexico. Life Cycle Red swamp crayfish inhabit a variety of waterbodies – everything from rivers, lakes, ponds, swamps, marshes, and streams to manmade systems like agricultural fields, irrigation channels, and reservoirs. They are ecosystem engineers that construct burrows in mud and sand. As opportunistic omnivores, they feed on plant material, animals, detritus, and sediment. During the fall breeding season, females can produce up to 500 eggs that will only take a few months to hatch. Juveniles are gray while fully grown adults range from red to brown and measure 4 to 6 inches long. Distribution Red swamp crayfish have been introduced throughout the United States They have been introduced to watersheds throughout the United States including Alaska and Hawaii, often via aquaculture and aquarium trade releases. In California, they have been observed throughout the state. Control Efforts Red swamp crayfish are considered established in California and may be taken with a sport fishing license. While they are not a restricted species, it is unlawful to release of red swamp crayfish and all other fish, animals, or plants, in the waters of the State without a permit (Fish and Game Code §6400.