Alex Fremier, Washington State University (IMAGE) Washington State University Caption Washington State University researcher Alex Fremier has found that the mating habits of salmon can alter the profile of stream beds, affecting the evolution of an entire watershed. He is seen here with a rainbow trout on Idaho's Lake Pend Oreille. Credit Carson Jeffres Usage Restrictions Please 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.