Up until recently not too much has been known about lionfish predators except from a small article about a cornet fish, recent findings in the Bahamas ( a nassau and tiger grouper), and the video of the the humpback scorpionfish devouring an adult lionfish (found on this blog). Maybe we should look past the open ocean for our findings. Maybe the aquarium trade, that started this mess, might also have some answers. The following facts are taken from a marine aquarist's site ( http://cache.search.yahoo.net/search/cache?ei=UTF-8&p=lionfish+spine&fr=yfp-t-501&u=www.reefkeeping.com/issues/2002-11/fm/feature/index.php&w=lionfish+%22lion+fish%22+spine&d=b9HYpRg5RPYb&icp=1&.intl=us ) : "Even though lionfish are venomous, lionfish are not immune to being harassed or even eaten by other fish. Large eels, frogfish and other scorpion fish are all predators of lionfish in the wild. According to Michaels (1998), large angelfish, pufferfish, and triggerfish are also known to harass lionfish. Triggerfish are notorious for nipping off the dorsal spines before killing lionfish. However, I have found the planktonic feeding triggers (Blue cheek, Pink-tailed, Niger) to behave more predictable towards lionfish."
When I get back to the Bahamas I will injure a lionfish and throw him in the midst of some feeding grey trigger fish and let you know what happened!
Thanks again to Amanda from Current for this article.