Sharks are at the top of the food chain underwater, but their lives are on the line now more than ever before.

A new study at the University of Hawaii shows millions of tiger sharks are getting hooked by long line fishing lines.

About a third of them bite through the line, or are set free with stainless steel hooks -- but it could stay in their jaw for an entire lifetime.

Carl Meyer, Associate Researcher at the Hawaii Institute of Marine Biology commented, "That can have profound consequences for those animals. It can injure or even perhaps kill them because they're unable to feed properly after these interactions."

Researchers hope fisheries switch over to carbon steel hooks, which eventually fall out within two and a half years.