ST George residents could be forgiven for hoping that a shark found at Peakhurst last week is not the fin edge of the wedge.
John Oryzak was on a daily walk with his dog when they spotted a Port Jackson shark on the banks of Salt Pan Creek.
"It's the first time I've seen a shark out here," he said.
"I was surprised, it being a shallow creek, having sharks here.
"I just hope there are no bull sharks."
Mr Oryzak said the big fish was about one metre long, and appeared to be a female adult shark.
A Primary Industries spokeswoman said the department's key shark expert was not able to comment on the find.
Port Jackson sharks are relatively harmless to humans as they have bony grinding plates in their jaws instead of teeth.
They live in sand and silt at the bottom of water bodies, feeding on urchins, molluscs, crustaceans and fish.
The sharks have spines on their dorsal fins and grow to little more than 1.6 metres long.
Have you seen sharks in strange places?