30/10/2026
When salmon in Canada leave the ocean to ascend freshwater rivers during their spawning migration—a phenomenon known as the “salmon run”—they undergo a radical metamorphosis. Driven by reproductive hormones, the males change both in color and physical appearance: red pigments (astaxanthin) are shifted from their muscles to their skin, while their skeletons are altered through the development of a hooked jaw (called a “kype”) and a dorsal hump.
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