Okay, the post title was just the obvious joke; sounds like a good idea — and maybe a delicious idea. “The best way to eliminate a species is if humans eat it,” says Robots in Service of the Environment Executive Director John Rizzi. On the other hand, wait! RISE?
Unfortunately reef top predators concentrate the dinoflagellates and their ciguatera toxin. The FDA limit on ciguatoxin is 0.1 ppb, it is not denatured by normal cooking and there is no rapid test.
Annals of Emergency Medicine, "Red Lionfish and Ciguatoxin",
Normally I would advocate eating an invasive species into extinction outside of its natural range.