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Four Tonnes Of Dead Fish Removed From The Darling River

Four tonnes of dead fish have been scooped out of the Darling River as the clean-up from the latest mass kill in NSW's far west winds up.

The NSW Department of Primary Industries (DPI) estimates close to one million fish died over the weekend at Menindee - the latest in a series of mass deaths in the area this summer.

All the fish had been cleared from the river by Thursday afternoon with contractors to review the clean-up operation on Friday, the DPI said.

Officials are also investigating the death of thousands of fish on the Murrumbidgee River in Redbank Weir about 100km west of Hay.

Up to 10,000 fish are believed to have died including Murray cod, golden perch, silver perch, and carp.

Fish washed up on the banks of the Murray Darling (Image AAP)

The same weather conditions which contributed to the Menindee deaths - a period of hot weather followed by a drop in temperatures - are likely to be the cause of the Murrumbidgee event, the DPI said.

The DPI warned hot and dry conditions to pose ongoing threats to native fish over the remainder of summer.

Locals, irrigators, and politicians have been arguing over who's to blame for the catastrophe with residents pointing the finger at water mismanagement.

Dead fish in the Murrumbidgee River (Image AAP)

A royal commission into the management of the Murray-Darling Basin Plan released its report on Thursday and was scathing of NSW Regional Water Minister Niall Blair's comments about the fish kills.

It said Mr Blair's public statements were "grossly irresponsible".

The report found river allotments were driven by politics and accused the basin authority board of maladministration over its disregard for science.

The NSW government said it will fully consider the report's findings before releasing an interim response on Friday.

Feature Image AAP