On a sunny morning in September, fishermen sail to shore in Ambolimailaky, a village along the coast of southwestern Madagascar. | Garth Cripps for Vox BAY OF RANOBE, Madagascar — The coral reef itself was exquisite. Growing about 3 miles offshore in 50 feet of water, it was a rugged terrain of pinks, blues, and oranges, set against a backdrop of deep blue. The coral pieces, each a colony of living animals, took on a range of unusual forms, from cake platters and pencil shavings to antlers and brains. But there was one obvious thing missing: fish. Like a city without people, the reef...

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