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For example, no bighead carp DNA was detected anywhere, including in Iowa where the fish are known to be.
WSJ: Study finds Asian carp numbers low in Minnesota
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But scientists have detected Asian carp DNA in dozens of water samples collected farther upstream, some just a few miles from Lake Michigan.
NPR: Gov. Quinn Open To Great Lakes-Mississippi Split
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The DNR said the report reflects the most rigorous study of Asian carp DNA evidence in Minnesota to date, according to the St.
WSJ: Study finds Asian carp numbers low in Minnesota
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Written by experts who pioneered use of genetic data to search for the aggressive fish, the paper disagrees with government scientists who say many of the positive Asian carp DNA hits recorded in or near the lakes in recent years could have come from other sources, such as excrement from birds that fed on carp in distant rivers.
WSJ: Report: Asian carp may have reached Great Lakes
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But scientists in recent years have detected DNA from Asian carp in waterways beyond the barrier, sparking debate over its effectiveness.
WSJ: Study: Asian carp unlikely to stow away in barges
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The Army Corps contends an electric barrier in a canal 37 miles from Chicago is preventing the carp from getting through, even though their DNA has turned up repeatedly on the other side.
WSJ: Report: Asian carp may have reached Great Lakes
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State and federal experts are studying whether the DNA could have come from sources other than Asian carp.
WSJ: Study: Asian carp unlikely to stow away in barges
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Some of the Chicago DNA was found in Lake Calumet, where a live bighead carp was caught in 2010.
WSJ: Report: Asian carp may have reached Great Lakes
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Researchers analyzed water samples for DNA fragments released to the environment, called eDNA. They found silver carp eDNA in Iowa, where the fish are abundant, but none near St.
WSJ: Study finds Asian carp numbers low in Minnesota
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The DNA that was found there was more than 100 miles from waterways infested with Asian carp.
WSJ: Report: Asian carp may have reached Great Lakes