Soupfin sharks (IMAGE) University of California - San Diego Caption Soupfin sharks schooling in the shallows off La Jolla, Calif. Scripps and USD researcher Andy Nosal found that these sharks return to the same warm waters every three years, presumably to help gestate their embryos. Credit Trystan Snodgrass Usage Restrictions Please credit Trystan Snodgrass 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.