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As Cindy and I are “on our own” out in the middle of nowhere, we wear “shark shields” (see: www.sharkshield.com). These devices put out an electric pulse which annoys the sharks ampulae of lorenzini and keeps them away at a range of 10-12 feet.
We haven’t been close enough to a pellagic shark to yet give a report on their effectiveness, but as the mantas have these biologic sensors, we ALWAYS TURNED THEM OFF WHEN IN PROXIMITY OF A MANTA RAY.
It is the trailing antenna that you see in the photo off Cindy’s right fin. We barely notice them underwater.
Isla San Benedicto – Revillagigedos Archipelago, Mexico
February 2, 2009