Fisheries officers are investigating the discovery of a shark corpse with the jaws removed.

The four-metre great white was found at September Beach in Lincoln National Park on lower Eyre Peninsula in South Australia.

Regional fisheries manager Andrew Carr said he had received some information but was keen for more if anyone could help the investigation further.

"It appeared to include perhaps half a dozen holes around its head area which, put two and two together, suggests it may have been shot," he said.

"But of more of a concern was that its jaws had been deliberately cut out, with clear saw marks through its cartilage.

"It's a bit disturbing and a bit disappointing. They are of course a protected species."