Juvenile salmon swim in a tube leading to a machine used to

UNITED STATES - MAY 20: Juvenile salmon swim in a tube leading to a machine used to embed a tag in the head of the fish at the Nimbus Fish Hatchery in Rancho Cordova, California, U.S., on Tuesday, May 20, 2008. The tag is laser-engraved with numbers which can be read under a microscope to determine where the fish was bred. The salmon fishing season in California and parts of Oregon was cancelled earlier this year because of low numbers of fish returning to the Sacramento River to spawn. The states have told the U.S. National Oceanic and Atmospheric Administration the closures of the commercial and recreational chinook salmon season may cost their economies $290 million, NOAA said. (Photo by Kimberly White/Bloomberg via Getty Images)