Not enough environmental disaster for you yet?

In the SMH today:

The threat of mass fish kills is emerging across the Murray-Darling Basin as low river flows and the influx of soil and ash from bushfires reduce water quality.

In recent days, fish deaths have been reported in the Macquarie River near Dubbo and the Macleay River east of the Dividing Range in NSW, while a "wall of mud and ash" is moving down the Upper Murray.

"Fish are just rolling over dead everywhere, it's a double-pronged disaster," said Lee Baumgartner, a fisheries expert at Charles Sturt University.

Professor Baumgartner said a NSW Fisheries team arrived near Tumbarumba in southern NSW to rescue endangered perch, only to witness sludge moving down the river "with the consistency of cake mix".

"They didn't rescue a single fish," he said. "It's just horrible."

The Murray-Darling Basin Authority revealed the scale of the threats to the health of freshwater ecosystems on Wednesday, with the release of a map showing almost all the major river valleys faced problems.

These ranged from "almost certain" algal blooms and low dissolved oxygen levels to high salinity and bushfire contamination.