The blue shark is one of the ocean’s most successful nomads. Blue sharks roam vast distances with some populations migrating nearly 10,000km across the open ocean. They can be found in every ocean on earth. But their wide distribution has earned them a dubious distinction: the most heavily fished shark on the planet. While it’s impossible to know for certain, scientists estimate that between 10 and 20 million blue sharks are killed every year by commercial fishing. This has caused their populati

ATTACKED BY SHARK? A swimmer was reportedly bitten by a shark on a Cape Cod beach in Truro, Massachusetts, rushed by helicopter for treatment and with authorities clearing beachgoers from the ocean. Linsey Davis reports. https://abcn.ws/2vJJieO | ABC World News Tonight with David Muir

HORRIFIC SHARK ATTACK: A 17-year-old girl was badly injured at a North Carolina beach in what one park ranger called a shark attack, with the teenager reportedly suffering deep lacerations on her leg, pelvis and hands. Diane Macedo reports. https://abcn.ws/2MoLJP2 | ABC World News Tonight with David Muir