By the fall of 2015, the salmon of the Connecticut River were supposed to be doomed. The silvery fish that once swam the Northeast’s longest river, 407 miles from the mountains of New Hampshire to Long Island Sound, went extinct because of dams and industrial pollution in the 1700s that turned the river deadly. In the late 1800s a nascent salmon stocking program failed. Then in 2012, despite nearly a half-century of work and an investment of $25 million, the federal government and three New England states pulled the plug on another attempt to resurrect the prized fish.

But five Atlantic salmon didn’t get the memo. In November, fisheries biologists found something in the waters of the Farmington River — which pours into the Connecticut River — that historians say had not appeared since the Revolutionary War: three salmon nests full of eggs.

“It’s a great story,” said John Burrows, of the Atlantic Salmon Federation, a conservation group, “whether it’s the beginning of something great or the beginning of the end.”

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