Sharks now roam the open ocean. But for 200 million years, they only lived near the sea floor

By Joel Gayford, PhD Candidate, Department of Marine Biology, James Cook University

When you picture a shark, you probably think of a large, powerful predator cruising the open ocean.

Species such as the great white shark, tiger shark and bull shark dominate popular media, with stories of rare and isolated cases of attacks on humans (such as the tragic death of surfer Mercury Psillakis last Saturday on Sydney’s northern beaches) instilling a widespread fear of sharks in the public, and influencing government policy. For example, the

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