Redfin Butterflyfish, Fiji, 2004Photograph by Tim LamanA redfin butterflyfish navigates the coral of Fiji's Vatu-i-ra Channel. This waterway, which separates Fiji's two biggest islands, is home to an immense variety of fish living amid some 2,500 square miles (6,500 square kilometers) of reefs and submerged plateaus. Conservationists are seeking to protect the region by winning its designation as a UNESCO World Heritage Seascape.