Maybe they're hanging out in Williamsburg. Or Coney Island, riding the Cyclone and playing Shoot the Freak. The Sharks that is, and not the gang from West Side Story.
According to a NY Daily News story by Barry Paddock, colonies of Tiger sharks visit the New York City area waters annually and marine biologists don't really know what they do or where they go. So they're going to catch some of them, attach a small sonic device to their fins, and track their movements. Hopefully, the research will help the population. "Seascape biologists hope to tag some two dozen sand tiger sharks, whose population has declined 80%," according to the story.