Shark Repellent

Shark bycatch is a major global problem, with millions of sharks caught unintentionally each year in fisheries targeting tuna, swordfish and other species. Even in U.S. waters, sharks are frequently caught on longlines, and many are discarded dead. Because sharks grow and reproduce slowly, these high bycatch rates threaten already vulnerable populations and disrupt marine ecosystems.

Researchers at FAU’s Charles E. Schmidt College of Science have developed a patent-pending zinc-and-graphite device to address the problem. The metals generate a small electric field that repels sharks from baited hooks while leaving target species unaffected. In Florida field trials, the device reduced shark bycatch by more than 60%. Inexpensive, scalable and practical for fishers, this technology has the potential to dramatically reduce bycatch and support more sustainable fisheries.

“Sharks have an incredible ability to sense even the smallest electric fields, and our tests show that this new approach can be used to keep them away from baited hooks,” said Stephen Kajiura, Ph.D., senior author, inventor and a professor in the FAU Department of Biological Sciences.

Read the press release.