Contact: Lily Whiteman
National Science Foundation
Caption: The proportion of salmon using the northern versus southern passage to the Fraser River in British Columbia, Canada, could be largely predicted by the magnetic fields of these passages; the closer the magnetic field at a passage entrance matched the field at the river mouth years before when the fish originally swam through it, the more fish used the passage.
Credit: Nathan Putman, Oregon State University
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Related news release: Animal magnetism: First evidence that magnetism helps salmon find home