Toxic Culprit of the Chesapeake

Investigators in Maryland used DNA analysis to solve a murky marine mystery. A type of algae called Pfiesteria piscicida causes fish die-offs in the Chesapeake Bay—and can also result in severe illness, including temporary brain dysfunction, for local fishermen and lab workers. Using techniques similar to DNA fingerprinting, researchers identified the DNA "signature" sequence for the species. A quick water test now enables health officials to detect when Pfiesteria is present in large quantities, or "blooming," and temporarily close waterways to keep people safe.

Illegal Wildlife Trade

From game poachers to importers, the illegal wildlife trade is a huge threat to animal populations around the world. Today, in an effort to reduce the pressures on wildlife, officials turn to DNA analysis to identify products made from endangered species.