This June 7, 2012 photo provided by the Oregon Department of Parks and Recreation shows a seaweed from Japan commonly known as wakame on a dock that floated up on Agate Beach near Newport, Ore., after being torn loose from a fishiing port in Japan by the 2011 tsunami. Scientists are concerned that some of the tsunami debris coming to the West Coast and Alaska could spread invasive species like this seaweed. (AP Photo/Oregon Parks and Recreation Department, ho)
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