When Bob Hersey Jr., a Maine lobsterman, pulls up his traps, he gets more than tasty crustaceans. He’s collecting vital details about the changing ocean environment.

Mr. Hersey, who also dives for sea urchins, is among nearly 150 fishermen who have installed temperature sensors on their traps or trawl nets from Maine to North Carolina as part of a program run by a nonprofit organization with help from the National Oceanic and Atmospheric Administration.

The soda-can-size sensors are dragged along the seafloor, giving fishermen and scientists a three-dimensional map of the ocean rather than just conditions on the surface, which can be checked using satellites or thermometers on boats. The data is continuously collected and fed into regional weather and climate models.

Read more in the New York Times here.

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