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Science

477 Whales Die in “Heartbreaking” New Zealand Strandings

October 12, 2022

WELLINGTON, New Zealand — Some 477 pilot whales have died after stranding themselves on two remote New Zealand beaches over recent days, officials say.

None of the stranded whales could be refloated and all either died naturally or were euthanized in a “heartbreaking” loss, said Daren Grover, the general manager of Project Jonah, a nonprofit group which helps rescue whales.

The whales beached themselves on the Chatham Islands, which are home to about 600 people and located about 800 kilometers (500 miles) east of New Zealand’s main islands.

The Department of Conservation said 232 whales stranded themselves Friday at Tupuangi Beach and another 245 at Waihere Bay on Monday.

A string of dead pilot whales line the beach at Tupuangi Beach, Chatham Islands, in New Zealand’s Chatham Archipelago, Saturday, Oct. 8, 2022. (Tamzin Henderson via AP)

The deaths come two weeks after about 200 pilot whales died in Australia after stranding themselves on a remote Tasmanian beach.

“These events are tough, challenging situations,” the Department of Conservation wrote in a Facebook post. “Although they are natural occurrences, they are still sad and difficult for those helping.”

Grover said the remote location and presence of sharks in the surrounding waters meant they couldn’t mobilize volunteers to try to refloat the whales as they have in past stranding events.

“We do not actively refloat whales on the Chatham Islands due to the risk of shark attack to humans and the whales themselves, so euthanasia was the kindest option,” said Dave Lundquist, a technical marine advisor for the conservation department.

Mass strandings of pilot whales are reasonably common in New Zealand, especially during the summer months. Scientists don’t know exactly what causes the whales to strand, although it appears their location systems can get confused by gently sloping sandy beaches.

A string of dead pilot whales line the beach at Tupuangi Beach, Chatham Islands, in New Zealand’s Chatham Archipelago, Saturday, Oct. 8, 2022. (Tamzin Henderson via AP)

Grover said there is a lot of food for the whales around the Chatham Islands, and as they swim closer to land, they would quickly find themselves going from very deep to shallow water.

“They rely on their echolocation and yet it doesn’t tell them that they are running out of water,” Grover said. “They come closer and closer to shore and become disoriented. The tide can then drop from below them and before they know it, they’re stranded on the beach.”

Because of the remote location of the beaches, the whale carcasses won’t be buried or towed out to sea, as is often the case, but instead will be left to decompose, Grover said.

“Nature is a great recycler and all the energy stored within the bodies of all the whales will be returned to nature quite quickly,” he said.

 

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