Answer:
They cannot be controlled.
Step-by-step explanation:
The lionfish is a species of fish which was introduced into the Atlantic ocean in the 1990's by accident. These fishes can adapt easily anywhere and has no natural prey to control its population.
Lionfish reproduce rapidly and its population has now become a threat to other fish populations in the ocean. They eat small fishes and other crustaceans in large quantity as their population cannot be controlled.
They are often called greedy as they consume a lot of food in the ocean which makes other fishes difficult to survive. Perhaps this can be attributed to the rapid increase of its population and the failure to control their rapid reproduction.