Dead Leopard Sharks Washing Up on Bay Area Shores by the 100s

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California Department of Fish and Wildlife Biologist Mike Donnellan holds a leopard shark. (Photo: California Department of Fish and Wildlife)

For the second year in a row, hundreds of dead or dying leopard sharks have washed up on the shores of the San Francisco Bay. Biologists say that the culprit may be stagnant saltwater marshes and the man-made lagoons of Foster City and Redwood City, which breed toxins and trap the sharks when they give birth during the spring. We'll discuss the population's largest die-off in six years.

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Sean Van Sommeran , executive director and founder, Pelagic Shark Research Foundation