Australia's Darling River plagued by millions of dead fish.

Millions of fish have died in the Darling River in Australia due to low oxygen levels in the water. This is the third mass die-off in the area since 2018. Recent floods had led to a boom in bony herring and carp populations in the river, with fish now dying off in the aftermath. Environmental authorities in the state of New South Wales have sent fisheries officers to assess the issue and warned that river oxygen levels could fall over the weekend amid rising temperatures.