From The Oregonian:
Genetic adaptation of hatchery steelhead starts hurting spawning success within just one generation, according to a study of Hood River fish that could lead to pinning down the causes of hatchery domestication.
Classic Darwinian evolution is clearly at work –- and it's working fast, the researchers concluded in their study, published today by the Proceedings of the National Academy of Sciences.
...Hood River steelhead that thrived in hatcheries had traits that were "beneficial in captivity but severely maladaptive in the wild," the study says.
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