Millions of dead fish wash up in Australian river after flooding and heatwave

Dead fish on the lower Darling-Baaka River near the New South Wales state far west town of Menindee (Australian Broadcasting Corporation/AP/PA)

Millions of fish have washed up dead in south-eastern Australia in a die-off that authorities and scientists say is caused by floods and hot weather.

The Department of Primary Industries in New South Wales said the fish deaths coincided with a heatwave that put stress on a system that has experienced extreme conditions from wide-scale flooding.