Abstract: A gaff for electrically incapacitating fish is disclosed. The gaff includes a handle and a hook. In a flying gaff, the hook is separable from the handle. In two embodiments, the gaff utilizes a piezoelectric sensor which when flexed by the weight of the fish produces a signal which activates a circuit which produces a stunning voltage across electrodes attached to the hook. Mechanical apparatus for activating the electric circuit are disclosed. Electrical circuitry diagrams are described which may be used with the piezoelectric sensor and the mechanical activation.