Without any natural predators, invasive lionfish populations grow unchecked and wreak havoc on marine ecosystems. Watch free divers hunt these poisonous fish. Watch the full documentary, Ocean Invaders, on NOVA: https://to.pbs.org/3hcaVrx Follow on social for more NOVA content! Twitter: https://twitter.com/novapbs Instagram: https://www.instagram.com/novapbs TikTok: https://www.tiktok.com/@novapbs