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.
Young Mandurah swimmer selected to compete at Special Olympics Australia National Games
Man charged after allegedly punching police officer in the face in Dawesville
Farm stay destroyed by fire in Baldivis
2026-27 State Budget 'the best for Mandurah in a long time'
Woman fighting for life after two-car crash in Hopeland
E-bike rider killed in Parmelia crash
Former Department of Communities employee hit with further child sex charges
Police, RSPCA investigate alleged bashing of dog in Baldivis
Construction tender now open for new mental health facility at Rockingham General Hospital