Fish slaughter device, comprising - a fish receiving space, which can be charged with fish to be slaughtered in the head-first position through a receiving space entry, - a fish positioning device, configured for controllably holding and positioning a fish in the fish receiving space in a temporary stop position of said fish, which is associated with at least one controllable fish slaughter tool for slaughtering the fish, and also configured for controllably releasing the slaughtered fish, comprising a fish head abutment element, against which the fish head of the fish abuts in the temporary stop position, which in addition forms a trigger element for controlling the at least one controllable fish slaughter tool and can be moved by means of a trigger device, which is controllable as a function of the fish size, into different trigger positions each determining the temporary stop position of the fish, and comprising a delivery means for releasing and delivering the processed fish, - the at least one controllable fish slaughter tool for acting on the fish in its temporary stop position, - a trigger sensor device for detecting the abutment of a fish head against the fish head abutment element and - the controllable trigger device, comprising the fish head abutment element, a stationary, controllable first control actuator with a first actuator element and a coupling means which connects the fish head abutment element to the first actuator element of the first control actuator for fish-size-dependent controllable adjusting movement of the fish head abutment element into the trigger positions, characterised in that the trigger device comprises a stationary, controllable second control actuator configured for fish-size-dependent adjustment of at least two trigger positions (TP1, TP2) having a second actuator element, wherein the second actuator element can be placed controllably into at least two fixed trigger adjustment positions (EP1, EP2), and that the two actuator elements (41, 51), i.e. the first actuator element and the second actuator element are coupled in such a manner that an adjusting movement of the first actuator element is stopped by a coupling impact against the second actuator element placed in one of its fixed trigger adjustment positions (EP1, EP2) and thereby brings about an associated said trigger position (TP1, TP2) of the fish head abutment element associated with the set fixed trigger adjustment position (EP1, EP2) of the second actuator element. - a fish receiving space, which can be charged with fish to be slaughtered in the head-first position through a receiving space entry, - a fish positioning device, configured for controllably holding and positioning a fish in the fish receiving space in a temporary stop position of said fish, which is associated with at least one controllable fish slaughter tool for slaughtering the fish, and also configured for controllably releasing the slaughtered fish, comprising a fish head abutment element, against which the fish head of the fish abuts in the temporary stop position, which in addition forms a trigger element for controlling the at least one controllable fish slaughter tool and can be moved by means of a trigger device, which is controllable as a function of the fish size, into different trigger positions each determining the temporary stop position of the fish, and comprising a delivery means for releasing and delivering the processed fish, - the at least one controllable fish slaughter tool for acting on the fish in its temporary stop position, - a trigger sensor device for detecting the abutment of a fish head against the fish head abutment element and - the controllable trigger device, comprising the fish head abutment element, a stationary, controllable first control actuator with a first actuator element and a coupling means which connects the fish head abutment element to the first actuator element of the first control actuator for fish-size-dependent controllable adjusting movement of the fish head abutment element into the trigger positions,