A two-metre white shark was spotted by a member of the public off Mandurah’s Avalon Beach about 7pm on Wednesday night.
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The report, tweeted out by Surf Life Saving WA, said the shark was seen in outer reef behind the lagoon, tracking north towards Halls Head.
The shark was reported to be breaching 1-1.5 metres out of the water, and was spotted roughly 150m offshore.
On Thursday at 12.23pm a three-metre unknown species shark was spotted by the Westpac helicopter south of Mandurah, 50 kilometres offshore.
The shark was tracking north.
Anyone who spots a shark is urged to contact WA Water Police on 9442 8600.