James Sulikowski, professor of marine science at the University of New England in Maine, surmises that the sharks are actually starry smooth hound sharks - and the scene is not unusual. "It's typically found in really shallow water up to about 100 meters," he told The Dodo. "The starry smooth hound will aggregate in large numbers, typically to feed, so seeing large numbers of this shark species close to shore is completely normal."
"Unlike most sharks," he explains, "the starry smooth hound eats crustaceans instead of fish."
And instead of humans. Since their teeth are made for crushing prey, not tearing flesh, "even 100 of them pose no threats to humans," Sulikowski says.