Northern or Virile Crayfish- Orconectes virilis- L= 5 inches.
Arizona is the only state in the continental United States where crayfish are not native. Originally introduced to the state’s waters to control weeds and to feed bass and other game fish, crayfish have spread to most of Arizona's aquatic systems. The problem with crayfish is that they are voracious consumers and breeders. They eat just about anything, both plant and animal, including each other. Crayfish have been implicated as a serious threat to Mexican garter snakes, Chiricahua leopard frogs and other threatened or endangered species in the Southwest. Crayfish can devastate trout streams. So please, help the environment by catching and eating all the crayfish you can.