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What impels small salmon, called smolts, out of their nursery brooks to the ocean? Across thousands of miles, the fish transmogrify from fingerlings into trollish adults—hook-jawed, toothy, and, in the case of many males, humpbacked. Though reversing the journey does not rescind their metamorphosis, the big fish famously return, waggling against currents, vaulting over dams, and pushing together, like a blade, toward the very gravel beds where, years earlier, they hatched.

…continue reading ‘Human Drugs Are Polluting the Water—And Animals Are Swimming in It’

Image: By Attribution is to be given to Dmitry Azovtsev. When using on the Web, a link to http://www.daphoto.info is appreciated., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=12810635

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The Atlantic

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