METHOD OF COLLECTING USEFUL PART OF FISH HEAD AND APPARATUS FOR COLLECTING USEFUL PART OF FISH HEAD

[Problem] If fish heads are those of the same kind of fish and of roughly the same shape, it is realized that only specific useful portions can surely be collected substantially irrespective of sizes of the fish heads, thereby improving efficiency of collection of the useful portions. [Means to Solve the Problem] 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.