Sacramento River - CA

Members of the media watch fingerling Chinook salmon being dumped into a holding pen as they are transferred from a truck into the Sacramento River on March 25, 2014, in Rio Vista, California.

A juvenile Chinook salmon swims away after being implanted with a tiny metal tag in its head at the Nimbus Fish Hatchery in Rancho Cordova, California.

Spring Chinook, courtesy of CDFW.