The scalloped hammerhead shark is most comfortable in warm water, but hunts by diving deep into the cold depths to hunt squid and other prey. A new study from the Hawai’i Institute of Marine Biology has found that the sharks stay warm by closing their gills in their dives to prevent heat loss.
The scalloped hammerhead sharks live in shallow, tropical areas but hunt for prey in deep, cold watersScalloped hammerheads are found in coastal, tropical waters like those near the island of Hawai'iIn a behaviour never before seen in fish, scientists have discovered that scalloped hammerhead sharks will hold their breath to stay warm as they hunt for squid in frigid waters 1,000 metres below the ocean's surface.
Royer said some "high performance" fish, like tuna and mackerel sharks, have specialised anatomy that allows them to warm parts of their body when they hunt in cold water. But there's no evidence that scalloped hammerheads have this.Royer and his team tagged sharks with sensors that allowed them to monitor swimming activity, body temperature and the properties of the environment they swam through, including water temperature and depth.
"If your water temperatures are colder than the fish's body, all of that heat will be dumped into the environment." Scalloped hammerheads are ectothermic, which means their body temperature changes with their immediate environment.
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