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Pictures | Fri Nov 30, 2012 | 6:07pm EST

Brought in ballast, aggressive seaweed spreads along East Coast

Red Asian seaweed is shown under a microscope in this undated handout photo supplied by Craig Schneider. REUTERS/Craig Schneider/Handout

Red Asian seaweed is shown under a microscope in this undated handout photo supplied by Craig Schneider. REUTERS/Craig Schneider/Handout

Red Asian seaweed is shown under a microscope in this undated handout photo supplied by Craig Schneider. REUTERS/Craig Schneider/Handout
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A diver surveys Red Asian seaweed in Nahant, Massachusetts in this undated handout photo supplied by Christopher Marks, of Northeastern University. REUTERS/Christopher Marks/Northeastern University/Handout

A diver surveys Red Asian seaweed in Nahant, Massachusetts in this undated handout photo supplied by Christopher Marks, of Northeastern University. REUTERS/Christopher Marks/Northeastern University/Handout

A diver surveys Red Asian seaweed in Nahant, Massachusetts in this undated handout photo supplied by Christopher Marks, of Northeastern University. REUTERS/Christopher Marks/Northeastern University/Handout
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Red Asian seaweed in Nahant, Massachusetts is shown in this undated handout photo supplied by Christopher Marks, of Northeastern University. REUTERS/Christopher Marks/Northeastern University/Handout

Red Asian seaweed in Nahant, Massachusetts is shown in this undated handout photo supplied by Christopher Marks, of Northeastern University. REUTERS/Christopher Marks/Northeastern University/Handout

Red Asian seaweed in Nahant, Massachusetts is shown in this undated handout photo supplied by Christopher Marks, of Northeastern University. REUTERS/Christopher Marks/Northeastern University/Handout
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