The waters in the US state of Florida have long been invaded by lionfish. The species proliferate quickly and prey on other creatures recklessly. Now they are being sold in restaurants while researchers are still finding ways to deal with them.

Lionfish have venomous spines so must be prepared with care. But Hari Pulapaka, the owner of Cress restaurant, is one of numerous chefs who see a role for themselves in controlling the species.  ”Lionfish, not having any natural predators, eats whatever it wants," he said. “And, like humans, given the chance it's going to eat delicious stuff itself, and so it tastes delicious in the process."

According to CGTN’s Steve Mort, lionfish prey on around 50 other species, and damage fragile corral reefs.

Florida wildlife officials have declared open season on lionfish, even producing videos explaining how to catch them. The US Geological Survey says releases from pet aquariums could be a reason for their introduction to US waters, where they became established about 15 years ago. Lionfish numbers have since exploded, spreading throughout much of the Caribbean in just five years. 

Aron Hasenei, a graduate student from Nova Southern University, said: "This has very real implications. If they are able to tolerate these hypoxic conditions they could very well be found throughout estuaries all along the Atlantic coast." 

That adaptability is hindering efforts to halt their spread. Lionfish often live in difficult to reach habitats and have to be caught by divers with spears, instead of traditional nets. The US government recently unveiled designs for lionfish traps to help get around the problem.