In an experiment a decade in the making, biologists are releasing hatchery salmon onto flooded Northern California rice fields, seeking to replenish endangered fish species while simultaneously benefiting the farmers’ business model.

At a time when environmentalists are often pitted against agribusiness in California’s water wars, conservation scientists and rice farmers are working together, trying to reclaim the great flood plains of the Sacramento River for salmon habitat.

Their task is daunting. California’s wetlands have all but disappeared, converted into farms and cities in one of the great engineering feats, or environmental crimes, of the 20th century.