This fish is off the scales!

The carcass of the giant ocean sunfish — known as Mola mola – was spotted at the mouth of the Murray River in South Australia’s Coorong National Park, according to CNN.

Linette Grzelak, who posted photos of the fish on Facebook, said her partner, Steven Jones, and his fishing partner Hunter Church thought it was “a piece of driftwood” when they drove by it on their truck.

“None of them had seen anything like this before,” Grzelak told the news outlet.

“They find all sorts of sea life along the beaches they dig but it has been mostly sharks and seals. This was something very different,” she said. “Steven said it was extremely heavy and its skin was leathery like a rhinoceros.”

National Parks South Australia said the sunfish are the world’s largest bony fish, which was discovered and named only in 2017 and can weigh more than a car.

It feeds largely on jellyfish and can grow to more than 6 feet – just over the length of the one found this weekend.

“The Mola mola is known for its large size, odd flattened body shape and fins,” the South Australian Museum’s fish collection manager, Ralph Foster, told CNN.

He said he was able to identify the fish from the markings on its tail and the shape of its head.

“Researchers have been putting satellite tags and data loggers on these fish and found they will come to the surface and lay on their side on the surface, hence the name the sunfish,” Foster said.

“Once they are warm enough they dive down several hundreds of meters and feed on jellyfish and stay down there for lengthy periods of time.

“We know very little about them. It’s only in the last few years that technology has allowed us to start learning about them,” Foster explained.

The museum said there was no way of finding out why the found specimen died.