sheila mcvicar reports. >> it's hard to believe a fish this beautiful, this fragile looking could be a menace. but the lyon fish is just that. >> they don't fear anything. >> he has made hundreds of drives over the florida coast. he has seen firsthand how lyon fish native to the indian and pacific association have overtaken local reefs. >> why are they a problem. >> they're such a problem, one, because we don't have a natural predator in our waters. secondly, they're rate of reproduction is ridiculous. one female over 2 million egg as year. the third thing is that they're gluttous eaters. they'll decimate our native fish population. >> the lyon fish is just the latest overloper to overwhelm florida, the state that has become the ellis island of invasive species. lyon fish are doing more than surviving. they're multiplying at a furious rate gobbling up marine life around them. this is a reef with a variety of fish. here's one where the lyon fish have taken over. the fight is not just to preserve the reef fish underwater colonies. lyon fish compete directly with recreational saltwater