Two Northern Pike (IMAGE) Swedish Research Council Caption Two northern pike (Esox lucius) returning to spawn in the stream where they were born. They will soon emigrate back to the Baltic Sea, where individuals originating from different streams coexist for most of their lifetimes. Credit Photo © Olof Engstedt 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.