FILE - This March 5, 2007 file photo shows workers harvesting bluefin tuna from Maricultura's tuna pens near Ensenada, Mexico. New research found increased levels of radiation in Pacific bluefin tuna caught off the coast of Southern California. Scientists said the radiation found in the fish came from Japan's Fukushima nuclear plant that was crippled by the 2011 earthquake and tsunami.  (AP Photo/Chris Park, File)
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