Delta Smelt Being Swabbed (image) University of California - Davis Share Print E-Mail 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. Share Print E-Mail 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.