One cool day in January 2006, eight students from Stanford University
went on a shopping binge—and not for the latest iPods or Levi’s. They
visited two dozen grocery stores, fish markets, and sushi restaurants
and brought home 77 fillets of Pacific red snapper.

Back at the lab, the students snipped off bits of flesh, digested them
with enzymes, and spun the DNA down in centrifuge tubes. They
identified the species of fish by sequencing segments of DNA. Their
results raised eyebrows all around.

Those generic strips of flesh might as well have been called marine
mystery meat. Sixty percent of them came from species other than what
was written on the label, including Pacific Ocean perch and tilapia.


http://www.conservationmagazine.org/...impostor-fish/