A shark attack has been reported at a West Australian beach south of Perth.

The shark was spotted at 4:50pm AWST and Surf Life Saving WA received a report of a person being bitten at 5:10pm at Pyramids Beach, south of Mandurah.

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It is understood an 18-year-old man was bitten on the foot.

He was taken to Peel Health Campus by ambulance but is not believed to have suffered life-threatening injuries.

Cont – shark sighted , report of shark bite incident. Fisheries investigating. Pyramids Beach, Mandurah. Reported: 17:10hrs 07/10

— Surf Life Saving WA (@SLSWA) October 7, 2015