Salmon Research (image) DOE/Pacific Northwest National Laboratory Caption This gravel bed in the Columbia River is the type of habitat salmon typically use to spawn, creating nests called redds. The lighter patches indicate redds that have been de-watered. Credit Photo courtesy of PNNL Usage Restrictions None 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.