These devices use an electric field to scare sharks from fishing hooks
A new gadget attaches to fishing lines and emits a pulse of electricity every two seconds
![Several blue, cylindrical SharkGuard devices hanging by string off a rail](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2022/11/111822_di_shark-device_feat.jpg?fit=773%2C580&ssl=1)
By attaching cylindrical SharkGuard devices (shown) to fishing hooks, tuna fishermen can greatly reduce the number of blue sharks accidentally snagged, a study finds.
Fishtek Marine