A young couple in the Puget Sound makes a living harvesting the world’s largest clam. Geoducks, the giant clams of the Pacific Northwest, are considered a seafood delicacy—although they’re mostly ...

Geoducks can reach 14 pounds and live more than 150 years—so long that scientists use rings on the clams' shells to track climate change. Geoducks are broadcast spawners: several times a year, in late ...