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Field assistant T. J. Ostendorf holds a lemon shark in a seaside pen at Bimini Biological Field Station. The shark is turned upside down to induce a sleep-like state. A repellent is considered effective if it can rouse a shark from this state. (Photo by G

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Tagged: BermudaBahamasNew JerseyFloridaT. J. OstendorfEric Stroudscience.