An article in the VI Daily News reports that the Lion Fish could cause the coral reefs in the Virgin Islands to be at risk. While this is normally a Pacific coast fish, they have recently been spotted in the warmer Atlantic Ocean and Caribbean Sea. "... many of the reef fish that the lionfish preys upon are herbivorous animals that eat algae off of coral reefs. These fish complete a vital link in the coral life cycle, cleaning the corals so they are healthy and helping create an atmosphere to allow baby corals to thrive. " (Vi Daily News)
This sounds like a very scary fish and if seen, should be reported to the Fish and Wildlife agencies. We need to do our part to save the coral reefs. Although their venom is toxic, it cannot kill humans, but can be very painful, so be careful if you see one of these fish.
Here's the Wikipedia description, yikes!