Here's the Smithsonian describing lionfish:
They have multiplied at a rate that is almost unheard of in marine history, going from nonexistent to pervasive in just a few short years. Along the way, they've eaten or starved out local fish, disrupted commercial fishing, and threatened the tourism industry. Some experts believe that lionfish are so widespread that their effect on the ecosystems of the Western Atlantic will be almost impossible to reverse. Still, some people are determined to try, if only to protect those waters which haven't yet been invaded.
|Lionfish-harvesting robot prototype.|
There have been a few suggestions for getting them under control - Glenn Reynolds (better known as Instapundit) recommends eating them, and the CEO of iRobot, the company that makes Roombas*, has developed a lionfish-harvesting robot.
Here's a more direct approach: Floridian Cortland Hunt made a video of his lionfish hunting expedition, using a modified Glock 9 mm that works underwater:
Shooting invasive Lionfish over 100ft underwater with customized Glock 9mm handgun in the Gulf of Mexico. The project started to see if we could shoot a gun underwater and it evolved into much more with the right people involved. Lionfish are an invasive species that need to be eradicated.
Recent Roomba-related post: When the Roomba runs over dog poop.