Delta Smelt Being Swabbed (IMAGE) University of California - Davis Caption A Delta smelt is swabbed to be genetically identified through a CRISPR tool called SHERLOCK. Credit Alisha Goodbla/UC Davis Usage Restrictions Provide credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.