How a handful of released aquarium fish overwhelmed an ocean.
Discover how lionfish, released in Florida in the 1980s, spread across the Atlantic with startling speed and devastating impact. Scientists trace the invasion through DNA research, reef surveys, and deepwater hunts, revealing why this predator is so hard to stop. Sign up to see the science behind a modern marine crisis and the bold efforts to fight it.
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Frequently asked questions
Yes. Every plan unlocks the full library — including all Curiosity Originals like Lionfish: Alien of the Sea — in up to 4K, ad-free, on all your devices.
Lionfish: Alien of the Sea is a Curiosity Original, exclusive to Curiosity Stream.
Watch on the web, iOS and Android, Roku, Apple TV, Amazon Fire TV, Chromecast, Android TV, and most smart TVs. Start on one device and pick up right where you left off on another.
Curiosity Stream is our streaming service — thousands of documentaries and originals. The Smart Bundle is Curiosity Stream plus four other independent streaming services (Tastemade, Kidstream, Curiosity University, and SOMM TV) on a single subscription.