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In the 1980s, they appeared seemingly overnight in San Francisco Bay. It’s unlikely that they made their way across the country on land or traveled around by water. Instead, this is probably a problem of our own making. It’s believed the crabs were carried to California, possibly as bait. However they got there, they quickly set to work multiplying.
Even still, their progress was slow at first. It took them until 2016 to make their way up the coast to inland Washington. Since then, tens of thousands of crabs have been captured and, despite a multimillion-dollar population control program, they’re probably there to stay.
“They cause a lot of damage. We call them ‘ecosystem engineers,’ because they like to dig and like to clip eelgrass, and they like to overeat a lot of shellfish,” said Bradt.
These invasive crabs arrived in New England in the early-1800s, hitching a ride in the ballast water of ships traveling from Europe. It wasn't until the 1960s, according to Bradt, that people began to notice a potential problem.
originally posted by: Spacespider
Good, now I can eat craps and save the planet at the same time