A shark advice has been issued for Preston Beach, south of Mandurah.
Part of a whale carcass was reported by a member of the public in the area just before 10am on Friday.
Authorities say the carcass could attract sharks close to shore.
"Although sharks may be present along the Western Australian coast throughout the year, people should exercise additional caution," a DPIRD spokesperson said.
If you see a shark, report it to Water Police on 9442 8600.
Teen accused of ordering firebomb attack on Baldivis tobacco shop
City of Mandurah sees sharp rise in animal cruelty reports
Geoff Valentine returns to Peel Thunder as senior coach
Golden Bay woman charged with lacing colleague's curry lunch with snail poison
Cooloongup man charged over alleged sexualised online conversations with a child
Bushfire readiness takes centre stage at City of Kwinana's free Summer Sounds festival
WA Open Golf Championship to tee off at Secret Harbour Golf Links
Halls Head named WA's most persistent storm damage hotspot
Four illegal e-bikes to be crushed after police crackdown in Halls Head, Falcon