Procambarus clarkii
In 1983, the state of Louisiana designated the Louisiana crawfish, "Procambarus clarkii", as their state crustacean. The native range of "P. clarkii" is along the Gulf Coast from northern Mexico to the Florida panhandle, as well as inland, to southern Illinois and Ohio. It is most commonly found in warm fresh water, such as slowly flowing rivers, marshes, reservoirs, irrigation systems and rice paddies. "P. clarkii" grows quickly, and is capable of reaching weights over , and lengths of .