LAMBERTVILLE, N.J. - An alien species of catfish has been caught in the Delaware Raritan Canal, prompting fears among environmental officials that the voracious predator could devastate native catfish, sunfish and some sturgeon populations the way it has in southeastern states. "The threat of the flathead is significant," Department of Environmental Protection Commissioner Bradley M. Campbell said in a statement Wednesday. "Anglers should report any catches or sightings of this fish to the Department." In the southeast, the U.S. Fish and Wildlife Service has listed the flathead as its highest priority among invasive animal species, the DEP reported. Flatheads, which...