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So when you look into the company itself, Mytinger & Casselberry, which eventually was neutralized and then was bought by Amway.

In this case, lead author Grace Casselberry, a postdoctoral researcher at UMass Amherst, and her colleagues deployed 16 receivers in a gridded array in the Bahia Honda Channel.

"It has taken 30 years to get the hammerheads to the point where they are just starting to recover," says Casselberry, "and all that work could be undone if we start killing sharks indiscriminately."

Casselberry and her colleagues suggest that anglers use fishing gear that will allow them to land tarpon faster, thus reducing fight times and the opportunity for depredation.

"We are advocating for anglers to think of themselves as part of the ocean ecosystem, rather than working against it," says Casselberry.