If the Water's Murky, Bull Sharks Thrive

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An Australian shark expert made a chilling prediction that environmental circumstances had become perfect for shark attacks on swimmers in Australia's Sydney Harbor, just days before January 18, when a bull shark mauled a 12-year-old boy.

Joel Nacarrow, owner of Hunter Shark Jaw Restoration, said that heavy rain, with murky water caused by river run-off, had created the perfect conditions for bull sharks. They thrive in brackish conditions, can tolerate freshwater, and are known to swim up rivers. He urged swimmers to stay clear of dirty water, river mouths, and low-visibility surf....

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