Trout Food Coated with Probiotic (IMAGE) Washington State University Caption The trout food is coated with the coldwater disease-fighting probiotic developed by Cain and Call. Credit Shelly Hanks, WSU Usage Restrictions None 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.