Even fish sometimes hold their breath in cold, dark, deep water.
. But this is the first time the behavior has been spotted in diving fish, says Mark Royer, a shark physiology and behavior researcher at the University of Hawaii at Manoa in Honolulu.
“Gills are like giant radiators strapped to your head,” Royer says, explaining that they leak heat. Because of this, a lot of shark species in the tropics tend to stick to roughly the first 100 meters of sun-heated water near the ocean surface, where temperatures hover around 26° Celsius. But tags attached to scalloped hammerhead sharks — a species found in coastal waters all over the tropics — revealed that these sharks take nightly, hour-long dives up to 1,000 meters below the surface.
For the next 23 days, these sensors tracked how the sharks moved, how deep they swam, and how their internal temperature changed. “It was kind of like attaching a Fitbit to a shark,” says Royer. “It allowed me to get precise details on what the shark was doing.”
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