lcd 16 u2032 displays all relevant information and operator instructions a further start touchpad 18 u2032 is used to initiate a u201c start selected sequence u201d routine an abort touchpad 20 u2032 initiates a u201c stop abort selected sequence u201d routine a sequencer touchpad 22 u2032 is accessed by microcomputer 24 u2032 to assist the operator to locate the required process the fish slaughtering and tissue sanitization apparatus described herein operates in either a manual or in an automatic operational mode either mode is selectable by the operator sequencer touchpad 22 u2032 runs the lcd 16 u2032 through a menu so the operator can identify and initiate selections as required the menu displayable via lcd 16 u2032 is set forth in the normal sequence of processing that is fish slaughtering sanitization tank fill fish slaughtering sanitization calibration u2014 supporting initiating lcd instructions fish slaughtering sanitization u2014 supporting initiating lcd instructions fish slaughtering sanitization tank empty tank decontamination empty fill tank decontamination u2014 supporting lcd initiating instructions tank decontamination empty it is to be noted that the three decontamination cycles are included as one automatic process before the fish slaughtering sanitization apparatus can be used in the u201c automatic u201d mode of operation it must first have been calibrated for the fish species in question this should be accomplished at an approved factory and or a properly equipped and approved onsite fish farm location in order to effect the calibration process tank 26 u2032 must first be filled with submicron filtered degassed water at the end of the calibration cycle tank 26 u2032 must be emptied and refilled with tap water in preparation for the follow on ultrasonic.