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Beat Goes On: Carp heart keeps pace when fish lacks oxygen

Without oxygen, a mere human dies in minutes, but a Scandinavian fish not only can survive but also maintains a normal heartbeat for days, say researchers.

The crucian carp (Carassius carassius) has long been recognized as a champion survivor, thriving even in shallow ponds that freeze over during long Northern winters. These waters can turn into dead zones as creatures exhaust the oxygen in the water.

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