Joseph Leverton on Instagram: "5 Fascinating Facts About Lionfish (Pterois species). 1. Venomous Spines for Defense: Lionfish have up to 18 venomous spines along their dorsal, pelvic, and anal fins. These are used strictly for defense and can deter most predators from even trying to attack. 2. Ambush Hunting Strategy: Lionfish are ambush predators, sneaking up slowly on prey, then striking with lightning speed using a quick gulp to swallow small fish and crustaceans whole. 3. Widespread Invaders