AP
Tommy Goszewski, a technician with the U.S. Geological Survey, holds a grass carp taken from a pond at an agency lab in Columbia, Mo., in spring 2013.
Scientists said Monday they have documented for the first time that an Asian carp species has successfully reproduced within the Great Lakes watershed, an ominous development in the struggle to slam the door on the hungry invaders.
An analysis of four grass carp captured last year in Ohio’s Sandusky River, a tributary of Lake Erie, found they had spent their entire lives there and were not introduced through means such as stocking, according to researchers with the U.S. Geological Survey and Bowling Green State University.
AP
This 2009 photo shows Erinn Beahan, a technician with the U.S. Geological Survey, holding a large grass carp taken from the Missouri River. Scientists have discovered that grass carp reproduced successfully in the Great Lakes watershed.
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Grass carp are among four species imported from Asia decades ago to control algae and unwanted plants in controlled settings such as sewage treatment lagoons. They escaped into the wild and have spread into the Mississippi and other rivers and lakes across the nation’s heartland, gobbling up huge amounts of plankton and threatening native fish.
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