The Fish that Ate Florida

As part of the BBC Life Stories season, exploring our relationship with the natural world, we travel under the sea in pursuit of a major ecological threat to Western Atlantic coasts - the Lionfish. The species, which recently spread from its natural territory in the Pacific to Atlantic waters, is aggressive, exotic and very, very hungry. How did the lionfish go from being an aquarium favourite to the scourge of an aquatic ecosystem that eats everything in its path?