The "rocks" in question are actually living coral formations. They attract lots of marine animals, which in turn draw predators such as snapper, ling, kings, bonito, sharks and the occasional grouper. Caryl says the unique thing about the Mansfield rocks is that they are within easy range of small boats, and almost always hold snapper. "If you don't find fish on one rock, try another," he advises. "Sooner or later you'll find the snapper, as well as other fish."