Investigations are continuing into a mass fish kill in the Murray River at North Yunderup.
The Department of Water believes around 3000 fish of mixed species, including bream, have died.
The department has since taken samples from the water and the fish to determine what caused the deaths.
Health authorities are urging people to stay out of the water and not to eat any fish from the river until the results are known.
Any fish deaths should be reported to the Department of Fisheries FishWatch on 1800 815 507.
Early voting for Secret Harbour by-election begins Monday
Welfare concerns for missing Swedish national last seen in Warnbro
Wanted man last seen in Golden Bay
Passenger critically injured in West Pinjarra crash
Unregistered painter fined for requesting hefty deposit from Singleton homeowner and not doing the job
Police hunt driver following dangerous Baldivis pursuit
Welfare concerns for boy last seen at Port Kennedy skate park
Rubbish truck catches fire in Baldivis
Driver injured in bus crash in Rockingham