#sharkguard

Marine scientists have designed a piece of technology that could drastically reduce shark bycatch by emitting short electrical pulses as a deterrent.

The small battery-powered device, known as SharkGuard, reduced the numbers of blue sharks accidentally caught by commercial fishing gear in a French longline tuna fishery in the Mediterranean by 91% and stingrays by 71%, according to a study in the peer-reviewed journal Current Biology.

Clipped on to the line next to a baited hook, SharkGuard emits a short pulse every two seconds. When that pulse temporarily overstimulates the electrical sensors around a shark’s nose and mouth – called the ampullae of Lorenzini – the shark swims away.

Dr Phil Doherty, lecturer in marine conservation science at the University of Exeter and lead author of the study, said that although SharkGuard is doing what it has been designed to do, further sea trials are required to assess its effectiveness in other fisheries.

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