The cod isn’t just a fish to David Goethel. It’s his identity, his ticket to middle-class life, his link to a historic industry.

“I paid for my education, my wife’s education, my house, my kids’ education; my slice of America was paid for on cod, said Goethel, a 30-year veteran of these waters that once teemed with New England’s signature fish.

But on this chilly, windy Saturday in April, after 12 hours out in the Gulf of Maine, he has caught exactly two cod, and he feels far removed from the 1990s, when he could catch 2,000 pounds in a day.

His boat, the Ellen Diane, a 44-foot fishing trawler named for his wife, is the only vessel pulling into the Yankee Fishermen’s Co-op in Seabrook. Fifteen years ago, there might have been a half-dozen. He is carrying crates of silver hake, skates and flounder all worth less than cod.

One of America’s oldest commercial industries, fishing along the coast of the Northeast still employs hundreds. But every month that goes by, those numbers fall. After centuries of weathering overfishing, pollution, foreign competition and increasing government regulation, the latest challenge is the one that’s doing them in: climate change.

Though no waters are immune to the ravages of climate change, the Gulf of Maine, a dent in the coastline from Cape Cod to Nova Scotia, best illustrates the problem. The gulf, where fishermen have for centuries sought lobster, cod and other species that thrived in its cold waters, is now warming faster than 99 per cent of the world’s oceans, scientists have said.

The warming waters, in the gulf and elsewhere, have caused other valuable species, such as clams, to migrate to deeper or more northern waters. Others, such as lobsters, have largely abandoned the once-lucrative waters off the southern New England states of Connecticut and Rhode Island, having become more susceptible to disease or predators.

Lobster catches in Maine are booming as the species creeps northward, but as the warming continues, that’s a good thing bound to end. A federal report from 2009 said that half of 36 fish stocks studied in the northwest Atlantic Ocean have been shifting northward over the past 40 years, and that the trend is likely to continue.

Fish aren’t the only ones moving on, and not just in the Northeast. The U.S. fishing fleet has dwindled from more than 120,000 vessels in 1996 to about 75,000 today, the Coast Guard says.

For the fishermen of the northeastern U.S. not all of whom accept the scientific consensus on climate change, and many of whom bristle at government regulations stemming from it whether to stick with fishing, adapt to the changing ocean or leave the business is a constant worry.

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