Researchers using DNA barcoding technology found that over 70% of shark fins and ray gill plates, collected from sellers in multiple countries, came from threatened species.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/dna-barcoding-helps-identify-endangered-species-market-specimens-sharks-and-rays
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/mongabay
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fisheries-0
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/illegal-trade
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/endangered-species
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/marine-life