There is a product on the market for all you surfers out there that you can purchase that claims to help protect you from Sharks. I first came across this product on the SurferMag Message Board.
The Shark Shield SURF generates an electrical field that is detected by the shark through its sensory receptors, known as the Ampullae of Lorenzini, found on the snouts of sharks. Once detected by the sharkâs sensors, the field causes muscular spasms that result in the shark being deterred from the area. The field is projected from electrodes in the tail of the unit that trail off the back of the surfboard, much like a legrope. This creates an elliptical field that surrounds the user with a shark safe zone that is up to eight meters in diameter.
There is more information to be found on Shark Shields Website however from what I understand it emits a kind of electromagnetic field that makes the Shark feel uncomfortable when within it. How this stops a Shark from barging in at 50 miles an hour and chewing your leg off I am not sure, however I would certainly use the product if I was surfing in Shark infested waters.
You can view more about the shark shield on the video below. Be safe out there – Rob