A shark warning has been issued for waters off Fremantle after a whale carcass washed up against the North Mole on Tuesday morning.
The decomposing whale carcass is on northern side of the North Mole near Port Beach, just outside the Port of Fremantle.
Fisheries WA said the carcass was reported by staff from the Fremantle Port Authority at 8.13am, and that people should exercise caution in the area until the remains are removed.
Fisheries advise whale carcass sighted 08:23hrs 11/07, North Mole, Perth Metro , Carcass is against the rock wall on Port Beach side. .
— Surf Life Saving WA (@SLSWA) July 11, 2017
Fisheries said the decomposing carcass will possibly "act as an attractant that could lead to sharks coming close in to shore" along the Fremantle coast.
Fisheries officers and staff from other agencies are monitoring the situation, and ask people in the area to report any shark sightings to Water Police on 9442 8600.
The whale in Fremantle comes after a whale carcass was spotted off Mindarie in Perth's northern suburbs over the weekend.
Fisherman Brendan McGregor spotted the whale carcass drifting nearly one mile out from Alkimos Beach on Saturday being warmed by sharks.
"I spotted the fin of the white pointer first, and then drove around the other side of the carcass just as it came in to take a big chunk out," he said.
"A tiger shark then surfaced and started ripping chunks off as well, and although the tiger shark was big, it looked tiny next to the white pointer."
Mr McGregor said the great white was easily bigger than his 5.2 metre boat, and estimated the animal to be around six metres long, and around 1.5 metres wide.
"We circled the whale for about half an hour watching them feed on it and it was quite spooky," he said.
"We got close enough that we could reach out and touch [them] if we were stupid enough!"
Another whale carcass was sighted on Sunday afternoon off Bowes River Mouth Beach, north of Geraldton.
You can check the Shark Activity Map on the SharkSmart website – www.sharksmart.com.au/shark-activity or the Surf Life Saving WA Twitter – twitter.com/SLSWA.
There's also www.sharksmart.com.au/news for current alerts and warnings.