by Sara HUSSEIN Agence France Presse Overfishing has wiped out over 70 percent of some shark and ray populations in the last half-century, leaving a “gaping, growing hole” in ocean life, according to a new study. Researchers found alarming declines in species ranging from hammerhead sharks to manta rays. Among the worst affected is the oceanic whitetip, a powerful shark often described as particularly dangerous to man, which now hovers on the edge of […]