Disaster of 2011 caused longest maritime migration ever recorded, with crustaceans, sea slugs and worms riding 4,800 miles on debris

The deadly tsunami that struck north-east Japan in 2011 has carried almost 300 species of sea life thousands of miles across the Pacific Ocean to the west coast of the United States.

In what experts are calling the longest maritime migration ever recorded, an estimated one million creatures – including crustaceans, sea slugs and sea worms – made the 4,800-mile (7,725km) journey on a flotilla of tsunami debris.

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