How You Can Track Great White Sharks on Your Phone

Shark Net app for iOS devices-2_Courtesy Stanford UniversityShark Net. Photo: Kip Evans

Tagging technology now allows anyone with a computer or mobile device to follow the movements of great white sharks.

Along the East Coast, people are tracking Mary Lee and Genie, two great whites. A group named Ocearch captured and tagged the sharks off the coast of Massachusetts earlier this year. Each time, they baited a hook, hauled the shark aboard a specialized platform, put a pipe in the animal's mouth that streamed running water through the gills, drilled holes through the dorsal fin, attached a SPOT tag, and let the predator go. Their tagging methods attracted some controversy. Environmentalists filed a petition with 750 signatures on asking for Ocearch's permit to be rejected. They said tagging methods that involved hooking and lifting sharks out of the water could cause harm. A September New York Times story mentioned that one shark tagged by Ocearch during a South African expedition died. The Ocearch crew brought scientists on board in Massachusetts to monitor the sharks, and sucessfully tagged and released the two sharks. Now, whenever one of those shark's fins breaches, a signal is sent to a satellite and then on to the Ocearch website. The locations of the sharks show up on an interactive map.

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