1. An apparatus comprising: a camera to capture an image of a shell of a live crustacean; an image processor, operatively coupled to the camera, to process the captured image to determine a physical attribute of the shell of the live crustacean, the image processor comprising a pattern detector to detect from the captured image a characteristic of a pattern on the shell indicative of moult stage of the live crustacean; and a controller, operatively coupled to the image processor, to control subsequent handling of the live crustacean based on the determined physical attribute.