Lionfish, though not native to the Great Barrier Reef, have become an invasive species in the area. Originally from the Indo-Pacific region, they were introduced to the Atlantic Ocean and Caribbean Sea, likely through the aquarium trade. Due to their lack of natural predators in these new environments and their voracious appetite, lionfish populations have exploded, posing a significant threat to native marine species and ecosystems, including the Great Barrier Reef. These venomous predators prey on small fish and invertebrates, potentially disrupting the delicate balance of the reef’s ecosystem. Efforts to control lionfish populations on the Great Barrier Reef include culling programs and encouraging lionfish hunting by divers, as well as promoting awareness about the issue among locals and visitors. While controlling lionfish populations is challenging, it is essential to protect the biodiversity and ecological health of the Great Barrier Reef.