Lionfish are a predatory reef fish. They eat native fish, which can reduce native populations and have negative effects on the overall reef habitat and health as they can eliminate species that serve important ecological roles such as fish that keep algae in check on the reefs.

What do lionfish do to the environment?

Invasive lionfish threaten native fish and the environment in U.S. Atlantic coastal waters. Invasive species are capable of causing extinctions of native plants and animals, reducing biodiversity, competing with native organisms for limited resources, and altering habitats.

How are lionfish affecting humans?

In humans, lionfish stings cause intense pain and sweating, and in extreme cases, respiratory distress and paralysis. The intensity and duration of these effects depend on an individual's sensitivity to the toxin and how many spines have stabbed them. ... Few studies have investigated what makes lionfish stings so painful.