Fisheries crews are trying to catch and kill a four-metre great white shark swimming close to several Perth beaches.
Under Western Australia’s controversial shark cull policy, a “rapid response” can be made to capture a large shark spotted swimming within one kilometre of the shoreline.
A Fisheries spokesman told AAP extra drumlines had been set up and could remain in place for up to an hour.
He said the great white would be destroyed if caught.
Surf Life Saving WA said the shark was first seen 200m off Trigg beach, before moving 400m off Scarborough beach, prompting the City of Stirling to close both beaches.
Shortly after 12.30pm (WST), Surf Lifesaving WA tweeted that those beaches had re-opened and the shark had moved to Floreat beach.
City beach and Floreat beaches are currently closed.
The shark cull trial sees any bull, tiger or great white sharks bigger than three metres caught on baited drumlines shot dead and dumped further out at sea.
The drumlines, set one kilometre off the metropolitan and southwest coast, have so far caught at least 104 sharks, including 101 tiger sharks, with 40 either found dead or destroyed, according to figures released last month.
The trial runs until April 30.