Andrew Rypel with Walleye (IMAGE) University of California - Davis Caption Lead author Andrew Rypel, currently an associate professor at UC Davis, holds a walleye in Wisconsin. Credit Andrew Rypel 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.