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Forty whales stranded in Golden Bay successfully refloated

Forty whales stranded on a remote South Island beach have been successfully refloated but concerns remain that they might beach themselves again overnight.

The pilot whales were re-stranded in the same area in Golden Bay where they were stranded yesterday. Source: Supplied

A pod of 49 long-finned pilot whales earlier stranded themselves on Farewell Spit, according to authorities. Nine of the whales died.

A spokesperson for whale rescue group Project Jonah, Louisa Hawkes, said volunteers helped keep the whales cool and comfortable throughout the day by drenching them with buckets of water, keeping them upright and making sure they didn't put too much pressure on their fins.

The evening high tide allowed them to refloat the whales, she said. The whales were spread out along the beach and one of their first tasks was to herd them together again in a pod. She said about 200 people, most of them volunteers, helped form a barrier as they moved the whales out to sea. Once in deeper water, boats took over and zipped back and forth in a line to prevent the whales from returning to shore.

But she said that despite their efforts, the whales hadn't swum away into the ocean and they feared they might beach themselves again.

“It's always fantastic to see whales out in deeper water where they should be,” Hawkes said. “Everyone is very hopeful but also very realistic.”

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Nine pilot whales dead as close to 50 stranded in Golden Bay

The whales were first noticed by a tour operator on Monday morning, the Department of Conservation said. Conservation rangers helped coordinate the rescue effort alongside volunteers from Project Jonah, while people who lived in the area also helped out.

Farewell Spit, a sliver of sand that arches like a hook into the Tasman Sea, has been the site of previous mass strandings. Sometimes described as a whale trap, the spit’s long coastline and gently sloping beaches seem to make it difficult for whales to navigate away once they get close.

There are different theories as to why whales strand themselves, from chasing prey too far inshore to trying to protect a sick member of the group or escaping a predator.

Four years ago, more than 650 pilot whales beached themselves on Farewell Spit in two separate mass strandings. More than 350 died while about 300 were saved.

Pilot whales are relatively small but can grow to over 6 metres.