Authorities are investigating a mass fish kill off Coogee.
Several hundred scaley mackerel have been reported floating between the Woodman Point Ammo Jetty and the Omeo Wreck, some washing up on Coogee Beach.
Department of Primary Industries and Regional Development (DPIRD) officers are gathering samples to work out why they died.
People are reminded not to swim in areas of water with large numbers of dead and decomposing fish because they may contain high levels of bacteria.
It is also advised not collect or consume the dead fish.
Police issue 31,000 driving infringements in first month of new AI cameras
Works underway on Rockingham and Safety Bay High School redevelopments
New measles exposure sites revealed in Bunbury
Dawesville man charged after allegedly leaving his elderly Great Dane to suffer painful conditions
Good Samaritan sought by police after helping teen during robbery in Baldivis
Under-16s social media ban now in force
Desperate search continues for missing Bunbury FIFO worker
Passengers now able to use credit, debit cards to tag on and off WA's public transport
New floating jetty speeds up emergency response times for Marine Rescue Mandurah