More than one million fish have died in the Murray-Darling river system over the past few weeks, and with the drought dragging on and more hot weather expected, scientists think more die-offs are likely.

In Canberra and Sydney, federal and state politicians are stressing the mass fish deaths have been caused by drought, and they argue there's not really too much they can do.

So is that really the case?

Or is the way we're managing the Murray-Darling basin making the problems worse?

Today on The Signal, we dig into the science of what's causing the mass fish die-offs.

We also try to work out whether the Murray-Darling Basin Plan actually functions in practice.

And we ask the experts what they think could improve.

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Adjunct Professor Darren Baldwin, School of Environmental Sciences, Charles Sturt University

Professor Lin Crase, Head of the School of Commerce, University of South Australia