Fishermen insist that there are plenty of cod and that the real problem is fuzzy science. They say the data are grossly inconsistent, pointing to a 2008 federal report that concluded that Gulf of Maine cod, though historically overfished, were well on the way to recovery.

The news is causing high anxiety in Massachusetts, where a wooden “Sacred Cod” has hung in the State House for more than 200 years and the fishing industry, though struggling, still figures prominently in the state’s identity.

“I can’t think of another fishery shutdown that would have the economic consequences of this,” said Steven Cadrin, a scientist at the University of Massachusetts, Dartmouth, who helped with the assessment.

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