Salmon (IMAGE) American Society of Agronomy Caption Pacific salmon spend most of their life in the ocean. These salmon, though, have an impact on the streambank ecosystem when they return to freshwater for spawning. Credit kayaklady via morguefile Usage Restrictions For use with story only 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.