Whether you like it or not as a scuba diver, as a snorkeler or as a conservationist, lionfish in the Caribbean are being slaughtered by scuba divers with spears. Invasive lionfish are out-breeding, out-competing and living longer than the native fish stocks and other marine species in the region. The native species that the invasive lionfish are decimating, are important for ecological, commercial and recreational reasons. So this article considers whether it’s right to kill these creatures on spears as scuba divers. For me it goes against the grain for the usual conservationist nature of scuba divers, as lovers of all marine creatures. But I will admit to joining a group of scuba divers that went on a culling exercise of lionfish.