The teams also suggested that the time for fish stocks to recover from the changes to their DNA and return to larger fish specimens will take five to 10 times longer than anticipated - if the DNA change can be reversed at all.

BBC: Fish on a trawler boat

The samples were poured through microfiber filters to extract DNA, which fish shed in their excrement, scales and body slime.

WSJ: Report: Asian carp may have reached Great Lakes

They tested 60 fish samples in the city using DNA identification.

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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

Scientists using DNA tests put the odds that your seafood is actually a cheaper, lower quality fish, at about one-in-three.

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His company Cofactor Bio offers a sequencing service to complement its GeneLaser DNA Sequencing Kit, which includes reagents for amplifying target sequences, and DNA Barcoding Kit, for identifying the biological origin of samples (available in editions for fish, fungi, flower plants, and other organisms).

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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

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