Shark Repellent’s Secret Ingredient

In his research to develop effective shark repellent, Eric Stroud has found that what works best are the rotten carcasses of other sharks, which had long been part of fishermen’s folklore.

“It’s the most godawful thing you ever smelled,” said Stroud, 35, a Ph.D. student in chemistry at Seton Hall who started his company, SharkDefense, to develop repellent technologies in 2004. SharkDefense has a $20-$25 can of shark-repelling aerosol spray available, but it also has repellents in the forms of magnets and metals. Go get some.

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