Diving in Australia
Some 1,200 miles in length and encompassing more than 13,000 square miles of ocean, the Great Barrier Reef Marine Park harbors an astounding variety of marine life, including more than1,600 species of fish, 600-plus types of coral, and more than 6,000 known varieties of invertebrates. Six of the world's seven species of sea turtle swim here, along with 30 species of whales and dolphins, giant black marlin and 133 species of sharks and rays. Diving activities take place all along the reef, with the northern areas generally considered the best sites. Some reefs are accessible by day trips from either Cairns or Port Douglas, but many of the best sites are reached only via a stay at offshore dive resorts such as Heron Island, or aboard a liveaboard dive vessel. A favorite liveaboard itinerary includes the Ribbon Reefs, where delicate soft corals grow to the size of a Christmas tree and starfish are electric blue. Big animal attractions include mantas, whales and sharks, and noteworthy finds include blue ring octopus, sawfish, ribbon eels, giant clams, harlequin tuskfish, wobbegong sharks and the giant potato cod. At the Cod Hole, groupers weighing up to 500 pounds interact with divers. Nearby Pixie Pinnacle has an incredible concentration of marine life for one small site - it’s all here - mantis shrimp, leafy scorpion fish, clownfish, lionfish, soft corals, giant fans, a proliferation of crinoids, nudibranchs and much more. Walls hold masses of chevron barracuda, dogtooth tunas and jacks swarm, with passing sharks always a possibility. In June and July, migrating dwarf minke whales pass through the Ribbon Reefs, giving divers a rare opportunity to view and interact with these fascinating marine mammals, A rare but not-to be forgotten sighting on outside reefs are the black marlin of up to 10 feet in length that will sometimes appear out of deep water. The reef continues north into the Coral Sea, offering some of the most exciting diving in the world. Spanning more than 1.5 million square miles of ocean, the Coral Sea contains hundreds of separate reefs, atolls, cays, and seamounts. This region is known for its vertical walls, enormous sea fans, multi-colored soft corals, sharks and amazing water clarity, which routinely exceeds 100 feet.