November 10th, 2016 — The decline of the American lobster population from the southern edge of its range in Long Island Sound stands in stark contrast to to the explosion in the number of landed lobsters in the colder Gulf of Maine waters the past few years.
Scientists are wondering what is going on with the important fishery, particularly as greenhouse gas emissions are blamed for a warming of ocean water. Are lobsters heading to colder water to hatch their young?
A study just funded by the Wildlife Heritage Foundation of New Hampshire will look at the issue off the Isles of Shoals, next summer. Starting next June, eight to 14 egg-bearing lobsters will receive hydroaccoustic tags and be tracked as they carry eggs and hatch them. The study will be off the Isles of Shoals.
Joshua Carloni, biologist in the marine division of New Hampshire Fish and Game, said it has been traditionally thought that female lobsters move to warmer water with their eggs in spring and release them there. But a 2012 study suggested they are moving to deeper water to hatch their eggs.
“Why that is we don’t know,”said Carloni. “We believe, historically this is what they have done, but it have not documented. The implications with warming water are known.” This study could possibly provide “concrete evidence that lobsters are moving to deep water once their eggs begin to hatch.”