Up to 90 whales have died and a 180 more are still stranded in a remote bay in southern Australia as a "challenging" rescue operation began Tuesday.

Scientists said two large pods of long-finned pilot whales became stuck on sandbars in Macquarie Harbour, on Tasmania's rugged and sparsely populated west coast.

Images from the scene showed shallow water thick with scores of the large slick-black mammals manoeuvering for space.

Government marine biologist Kris Carlyon said "about a third" of the animals were dead by late Monday and rescuing survivors would be "challenging" task likely to take several days.

Though mass whale strandings occur relatively often in Tasmania, such a large group has not been seen in the area for more than a decade.

The animals are only accessible by boat, limiting the number of rescuers who can reach them.

About 60 people -- including volunteers and local fish farm workers -- are involved in the rescue attempt.

They are battling cold, wet conditions as well as the harbour's unusual tides which are dictated by barometric pressure.

"In terms of mass whale strandings in Tasmania, this is up there with the trickiest," Carlyon told reporters in the nearby town of Strahan.

However, Carlyon said many of the partially submerged whales should be able to survive for the several days it would take his team to complete the task, in part due to the inclement weather.

"It's pretty ugly for people on the ground but as far as the whales go its ideal -- it's keeping them wet, it's keeping them cool," he said.

Carlyon said rescuers would still have to "triage" the whales, prioritising the healthiest and most accessible.

Most of a 30-strong group on a nearby beach were found dead Monday, while about 60 other whales on the sandbars are also believed to have since died.

Once the whales are returned to the water, Carlyon said, the biggest challenge will be herding the social creatures out of the sandbar-riddled harbour and back into the open ocean.

Scientists said it was unclear what caused the latest stranding, but have suggested the pod may have gone off track after feeding close to the shoreline or by following one or two whales that strayed.

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Up to 70 whales stranded in southern Australia
Sydney (AFP) Sept 21, 2020
Around 70 whales are stranded in a bay on the Australian island of Tasmania, officials said Monday, with marine experts now mobilising to see if a rescue is possible. The whales are in Macquarie Harbour, on the island's rugged and sparsely populated west coast, where they are believed to be stuck on a sandbar. Police are on site and marine experts are being deployed to assess the situation, Tasmania's environment department said. "Additional crews with whale rescue gear will arrive later tod ... read more