Matt Rand, director of Global Shark Conservation for the Pew Environment Group said that this was the latest of a number of studies "confirming the importance of preserving the parts of the ocean where sharks breed and raise their pups".
And about a third of ocean-going sharks appear on the internationally-recognised Red List of Threatened Species.
The rapid reduction of sharks is disrupting the ocean's equilibrium, according to Peter Knights, director of WildAid International.
Great white sharks are attracted to the warm ocean currents along Australia's southern coastline and are a constant concern for divers who work in the sea.
The observation takes account of new research that shows hammerhead and great white sharks patrol fixed routes in the ocean, gathering at hotspots to mate or feed.
Even when the sharks are found closer to the ocean surface, they spend their time in the cool-temperature, plankton-rich waters that limit underwater visibility and make diving difficult.
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The researchers hope the findings will help discourage the practice of shark-finning, in which the fins of as many as 70 million sharks a year are sliced off and the sharks are dumped back into the ocean to die.
Sharks are the top predator in the ocean and are vital to its ecosystem.
The sharks are then dumped back in the ocean and left to die.
Without their fins, sharks cannot swim and they sink to the ocean floor, where they're picked at by other fish and left to die.
Previous research by Dr Baum's team has found that sharks are declining rapidly in parts of the Atlantic Ocean.
But destructive fishing pressure has sharply depleted ocean wildlife, some by 90 percent in 50 years, including sharks, tunas, marlin, menhaden, groupers, snappers, tarpon, turtles, shrimp, crabs and others.
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The most dangerous thing I tried there was swimming in the ocean, which I've heard on good authority is full of sharks.
Liquid Robotics, the Silicon Valley startup that makes the surfboard-sized robot called a Wave Glider, announced Wednesday that Papa Mau arrived off the coast of Queensland, Australia, on Nov. 20 after surviving storms, sharks and 25-foot surf while its solar-powered sensor arrays collected terabytes of data on ocean and atmospheric conditions during the year-long journey.
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