an online publication about science and society in coastal ecosystems. Read more stories like this at Of all the traits that make salmon extraordinary migrants—their leaping prowess, their tolerance of both fresh and salt water, their attunement to the Earth’s magnetic fields—the most impressive might be their sense of smell. Guided by the odors they imprint on in their youth, most adult salmon famously return to spawn in the stream where they were born.
In 2016, the Oregon Department of Fish and Wildlife tasked the state’s hatchery research center with solving the problem. Could scientists get juvenile hatchery-reared fish to imprint on a scent of their own choosing, one that would lure them home years later? In his Seattle laboratory, Dittman supplemented Kamran’s efforts. He placed electrodes on the salmon’s smell receptors, then spritzed them with Kamran’s chosen scents to see how their neurons responded. “Whatever odors we picked,” Kamran says, “we had to see if the salmon noses could actually detect it.”
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