The Lionfish is an extremely aggressive, carnivorous fish native to the Indo-Pacific region that has become an enormous problem in the Atlantic ocean as an invasive species. These fish have long, venomous dorsal spines and intense coloration to deter predators, and are in fact top predators themselves in reef environments. These fish have become problematic due to their defense mechanisms, ability to reproduce every 3-4 days when mature, and their appetite for a wide variety of fish. People will go out with spear guns to hunt them in reef environments (I, myself, have hunted them in Aruba). The Lionfish is an extremely aggressive, carnivorous fish native to the Indo-Pacific region that has become an enormous problem in the Atlantic ocean as an invasive species. These fish have long, venomous dorsal spines and intense coloration to deter predators, and are in fact top predators themselves in reef environments. These fish have become problematic due to their defense mechanisms, ability to reproduce every 3-4 days when mature, and their appetite for a wide variety of fish. People will go out with spear guns to hunt them in reef environments (I, myself, have hunted them in Aruba).