Lionfish can eat prey that are more than half their own length and are known to eat more than 70 marine fish and invertebrate species including yellowtail snapper, Nassau grouper, parrotfish, banded coral shrimp, and cleaner species. They also compete for food with native predatory fish such as grouper and snapper. They may negatively impact the reef habitat by eliminating organisms that serve important ecological roles, such as herbivorous fish that keep algae in check. Adult lionfish spread their pectoral fins and use them to “herd” prey and then often corral them into a corner. They are the only species known to blow water at prey in an effort to get prey to turn toward the lionfish before being devoured.