Abstract: Fish sex discrimination equipment and method comprising an automatic supplying unit, a light projection and reception detection unit, a discrimination control unit, a discharge unit, and a first conveyor and a second conveyor, and also comprising the steps of automatically supplying fish to be discriminated, transmitting light to a genital gland area of the fish, scanning the light, discriminating the sex of the fish based on the quantity of light tramsmitted, for example, a mean value or integrated value, and discharging the fish through the first or second conveyor which corresponds to the sex of the fish.

Abstract: A fish processing apparatus including an image pick-up device for producing image information of a fish and a memory for storing the image information. A cutting position of head portion of the fish is determined in accordance with the image information. The relative position between the fish and a head cutter for cutting the head portion of the fish is adjusted in accordance with the determined cutting position.