09 Feb '12, 1pm

Wild Salmon Are Not Holding Up, Study Shows

Wild Salmon Are Not Holding Up, Study Shows

Associated Press A Chinook smolt being released into a holding pond at a hatchery. Since 1964, the Mokelumne River Fish Hatchery in California has supplied the watershed with four to 10 million juvenile Chinook salmon each year. The hatchery began the practice as a way of countering the effects of dams that block migration and making sure that the salmon population remained viable. But recent research shows that the massive influx of hatchery-raised fish is masking the fact that wild fish populations are not holding up. “Without distinguishing hatchery from wild fish, the perception is that we have healthy salmon surviving in a healthy river,” said Rachel Johnson, a fish ecologist affiliated with the University of California, Santa Cruz, and the lead author of a new paper published in the journal PLoS One. Most hatchery-raised fish are unmarked, but Dr. Johnson and her col...

Full article: http://green.blogs.nytimes.com/2012/02/09/hatcheries-vs-w...

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Wild Salmon Are Not Holding Up, Study Finds:

green.blogs.nytimes.com 09 Feb '12, 2pm

John Hannon/United States Bureau of Reclamation Juvenile Chinook salmon in restored habitat in the American River in Calif...

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