Beach shark warning as warm weather hits US beach

The predators feast on a flourishing seal population off Cape Cod.

Great white numbers increase in July (Getty Images Europe)

Beachgoers in Cape Cod in the US state of Massachusetts have been warned that warmer weather brings greater numbers of white sharks.

July tends to be when great whites appear in earnest as the cape’s waters warm, with sightings peaking from August through October, according to scientists with the Atlantic White Shark Conservancy.

Megan Winton said: “Just know that large sharks are here. They’re a constant presence from June to the fall.”

A great white sighting forced the temporary closure of Head of the Meadow Beach in Truro on Tuesday.

Greg Skomal, a state marine biologist who has been studying the region’s great whites for decades, said the predators still tend to be concentrated on the Atlantic Ocean-facing side of the cape, where they feast on a flourishing seal population.

He advised beachgoers to be most vigilant when swimming off beaches where the shoreline quickly drops off into deeper waters.

“Sharks will come close to the shore when they have water depth,” Skomal said.

Since 2009, researchers have tagged more than 280 great whites off the cape, with nearly 230 of those tags still active and sending back data about shark movements, according to the scientists.

Skomal and Winton have spent years studying white shark migration and hunting behaviour. They say the ongoing research has helped increase beach safety by giving local officials and beachgoers alike a better understanding of where great whites appear, as well as what times of the day they are most active.

Skomal said there had been a marked change in beachgoer behaviour since the region saw two shark attacks on humans — one of them fatal — in 2018.

Many are increasingly keeping closer to shore when they swim, with others not venturing into the waters at all, he said.

“It’s a conservation success story in terms of sharks and seals,” Winton said. “At the same time, this is an important place for people to recreate, so it’s important to find ways to coexist.”