The Fish Cannon 2000 is a hydraulically, electrically, or pneumatically driven, six-barrel, water-cooled, electrically fired Gatling-style rotary cannon which fires fish caliber fish at an extremely high rate (typically 6,000 rounds per minute). The FC2k and its derivatives have been the principal cannon armament of United Fish States military fixed-wing aircraft for over forty years, as of the turn of century.