Salmon migration mystery explored

September 18, 2009 at 5:51 am Leave a comment

Temperature differences and slow-moving water at the confluence of the Clearwater and Snake rivers in Idaho might delay the migration of threatened juvenile salmon and allow them to grow larger before reaching the Pacific Ocean. A team of Northwest scientists are examining the unusual life cycle of the Clearwater’s fall Chinook salmon to find out why some of them spend extra time in the cool Clearwater before braving the warm Snake. The Clearwater averages about 53 degrees Fahrenheit in the summer, while the Snake averages about 71. The confluence is part of the Lower Granite Reservoir – one of several sections of slow water that are backed up behind lower Snake and Columbia river dams – that could reduce fish’s cues to swim downstream……..
http://www.biology-blog.com/blogs/permalin…

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