Abundant hatchery salmon mask weak numbers of wild fish

By on February 14, 2012

Among Chinook salmon returning to California’s Mokelumne River to spawn in 2004-5, hatchery-raised fish far outnumbered wild fish, according to a recent study led by an ecologist from University of California, Santa Cruz.

Most hatchery fish in the Mokelumne River aren’t marked, so the researchers analyzed chemical markers in ear bones from salmon carcasses to distinguish between wild and stocked fish. They found only 4 percent of the Chinook returning to spawn were born naturally.

The study raises questions about the viability of wild Chinook populations the role of hatchery programs in salmon conservation, according to a report from the New York Times.

Read more at the New York Times

Image credit: U S Department of the Interior

About Jeff Gillies

Jeff Brooks-Gillies has written about science, energy and the environment for going on 10 years. He's a native Michigander who, after a stint in Colorado, lives in Indianapolis with his wife and two kids.

Leave a Reply

Your email address will not be published. Required fields are marked *

Time limit is exhausted. Please reload CAPTCHA.