I have no personal experience with Lionfish in the wild, but in my saltwater aquarium experiences, they seem to love Damsels. I tried to feed frozen blood worms to all my meat eating tropical fish to keep down aggresive behavior in the tanks. But Damsels were a pretty blue color and just caught the eye of the Lionfish. In the wild, they are traditionally reef dwellers and as such will feed off any prey small enough to fit into their mouths which also swims on the reef. But here in Alabama they have been found on shallow water oyster reefs, and even non-reef situations in very shallow water near shore. That is why the state wants to check the contents of their stomachs to see just what they are feeding on. I would assume that killifish would be the food of choice and the reason that the lionfish are going into the shallows to feed on them. Killifish are a favorite food fish for many of our local fish and since the oil spill, they are not around in the large numbers of years past. The current shortage of killifish as a food source for our flounder, spotted sea trout, redfish and many others is already a problem of concern. And if the lionfish consume a large quantity of the already small numbers of killifish, it can cause a ripple effect in the recovery of the numbers of other overfished species such as the redfish. The lionfish does not have a lot of natural controls here in our local waters because of their good defense systems. And it is assumed that they are breeding at a very high rate with a very good survival rate, thus rapidly becoming a threat. Plus the large number of oil rigs and snapper reefs off the Florida, Alabama, Mississippi, Louisana, and Texas coast create a type of habitat which is desirable to the lionfish.