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The Asian carp captured this summer near the southern tip of Lake Michigan — triggering a big scare — apparently slipped past electric barriers.
Officials announced Friday that a necropsy of the 4-year-old fish showed that it originated in the Illinois/Middle Mississippi watershed, spending about a year in the Des Plaines River area.
It spent no more than a few months in the Little Calumet River before being captured on June 22, about nine miles from Lake Michigan.
But the Asian Carp Regional Coordinating Committee said it still doesn’t know how the fish made it past the U.S. Army Corps of Engineers’ underwater electric barriers.