The original “salmon cannon,” as it was dubbed on social media, was first used to get fish into a truck or when handling/transferring them into a hatchery or aquaculture operation. The fish were manually loaded into the bottom end of the system, where the lower air pressure inside sucked them in and up the tube. A pressure difference of about 2 PSI shot the fish along at 5 to 10 m/sec (16 to 32 ft/sec).