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Maine baby lobster decline could end high catches

A decline in the number of baby lobsters may presage a shortage that comes on the heels of a record harvest in the past few years. It takes babies eight years to mature for harvest.
A decline in the number of baby lobsters may presage a shortage that comes on the heels of a record harvest in the past few years. It takes babies eight years to mature for harvest.
Published Apr. 28, 2014


The number of baby lobsters settling off the rocky coast of Maine continues to steadily decline — possibly foreshadowing an end to the recent record catches that have boosted New England's lobster fishery, scientists say.

A University of Maine survey of 11 Gulf of Maine locations indicates that young lobsters have declined by more than half of their 2007 levels — significant since lobsters typically take about eight years to reach the legal harvesting size.

The downward trend has lobstermen, retailers, state officials, and ocean scientists concerned that the impact could soon be felt on dinner tables nationwide. Maine lobsters were 85 percent of the nation's lobster catch in 2012.

Warmer ocean temperatures, pollution, atmospheric conditions and changes in predation and availability of food could all be to blame, scientists, state officials and industry leaders say. Lobsters are very sensitive to even subtle changes in temperature, scientists say.

Maine Department of Marine Resources officials say the decline does not appear to be the product of overfishing as some environmental groups contend.

The last three years have brought record hauls to Maine's lobster industry, more than 350 million pounds — by far the most for any three-year period according to state data that go back to 1880. The value of the catch has topped $1 billion for the first time.

Larger catches generally follow high levels years earlier of baby lobster settlement — the process in which young lobsters reach the ocean floor and grow. The boom in lobster catches in recent years follows a trend of heavy lobster settlement in the mid 2000s, university scientists say.

But that pace might not be sustainable, says Carl Wilson, the state's lobster biologist.

"It's our first indicator that things might be changing in the future," Wilson said. "Low settlement, it's thought, in the future will lead to lower landings."

Maine lobsters' eggs hatch in the early summer and larvae swim freely about six to eight weeks before settling at the ocean bottom as inch-long post-larvae. Divers for the University of Maine have been tracking their settlement rates since the late 1980s.

The higher temperatures could cause lobsters to migrate north, a trend also suggested by higher settlements being seen in the southern Gulf of St. Lawrence in Canada, Wahle said. The temperature change could also increase predation from fish following the warm waters north, he said.

Fewer baby lobsters are unlikely to directly translate into a drop in lobster catch, as market forces and laws governing lobster catch limits also play a role, Wahle said. But the university's data suggest a dropoff in landings could come in 2016, possibly earlier, he said. The findings come as some scientists and fishermen are concerned that Maine's lobster industry bubble could burst after years of record catches.

"It's telling a story of gradually — and more recently rapidly — declining settlement in the Gulf of Maine on a widespread basis," Wahle said. "This is what's raising lots of concern."

Maine has about 4,500 active lobstermen and 2 million lobster traps in the water.


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