Abstract: Useful portions in the fish heads W are collected from a number of fish heads W of the same kind of fish and of roughly same shape, pituitaries M. A useful portion line is preliminarily determined which passes pituitaries M as useful portions of the number of fish heads W having different sizes when the fish heads W are rested in a specific posture, and each of fish heads W to be processed is rested in the specific posture, and the rested fish head W is cut in the vicinity of the preliminarily determined useful portion line substantially along the useful portion line to expose an useful portion, and a brain as an untargeted portion which is present in a cut surface F is removed to expose the pituitary M, and the exposed pituitary M is collected.

Abstract: From a number of fish heads W of the same kind of fish and of roughly the same shape, pituitaries M as useful portions in the fish heads W are collected. A useful portion line is preliminarily determined which passes pituitaries M as useful portions of the number of fish heads W having different sizes when the fish heads W are rested in a specific posture, and each of fish heads W to be processed is rested in the specific posture, and the rested fish head W is cut in the vicinity of the preliminarily determined useful portion line substantially along the useful portion line to expose an useful portion, and a brain as an untargeted portion which is present in a cut surface F is removed to expose the pituitary M, and the exposed pituitary M is collected.