Martin Arostegui scans the ocean floor as he snorkels above a patch reef just east of the Ragged Keys. Spear gun in hand — just in case; he had a close encounter with a bull shark here once — the retired doctor looks for fish. Any fish.
A small black grouper swims by, its olive gray skin and dark blotches standing out against the gray backdrop of a rocky reef bottom covered with dead coral. After snorkeling for 15 minutes, the lone grouper and a few small grunts were the only fish in sight.