A dolphin breaks the water's surface for air in an inlet off Tampa Bay. Toxic chemicals known as PCBs, polychlorinated biphenyl, have built up in the food chain, and marine mammals have the highest concentration of any species. The chemicals suppress immune systems and can harm reproduction.

Photo by DAVID AHNTHOLZ, Daily News

A dolphin breaks the water's surface for air in an inlet off Tampa Bay. Toxic chemicals known as PCBs, polychlorinated biphenyl, have built up in the food chain, and marine mammals have the highest concentration of any species. The chemicals suppress immune systems and can harm reproduction.

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