A fish can cope with bitter cold and still run into a much more basic problem: an empty stomach. Under a thick roof of Arctic ice, finding food can matter as much as surviving the temperature.
That is why scientists once doubted that fish could live near the North Pole during the last ice age. They thought too little life grew beneath the ice to keep fish fed.
Tiny fish ear stones recovered from the seafloor now challenge that picture.
They show that ice cod and polar cod lived near…
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