How Migratory Fish Navigate India's Rivers During the Monsoon Using a Biological Compass Science Is Still Mapping
The fish that reads the river like a mapThe Hilsa, Tenualosa ilisha, can detect a change in water salinity of less than 0.1 parts per thousand. That sensitivity is not incidental. It is the opening move in one of the most precise navigational performances in freshwater biology. Every monsoon, adult…
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