WATCH: Hundreds of thousands of fish die in Australia

Authorities are blaming the mass death on a toxic algae bloom due to changing weather conditions.

It's the second incident of mass fish death along the Darling River since 10 000 fish died in December.

Officials said that a sudden cooling of the temperature over the weekend killed a pre-existing algae bloom in the area.

It resulted in the decomposing algae draining oxygen from the river.

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