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Biology

Olfactory Imprinting and Natal Homing in Salmon

Quick fact

Salmon can distinguish their home stream from others based on a unique chemical 'bouquet' of dissolved minerals and organic compounds, and they learn this bouquet during a brief juvenile critical period.

Why this is interesting

A salmon that left its home stream as a fingerling can return years later to the exact same gravel bed, sometimes traveling thousands of miles. How does it find its way back with such precision?