Governments have also emptied the Menindee Lakes system rapidly, rather than leave water in reserve for dry times. The mercury at Menindee is forecast by the Bureau of Meteorology to hit 41 degrees or more for at least six days from Friday.
"They are rotting, they're large corpses, they're bloated in the water".
In the town itself, the stench from rotting fish carcasses near the main boat ramp wafts into the Burke and Wills Menindee Motel.
The duo blame state and federal governments for the "environmental disaster" affecting the golden perch, Murray cod and bony herring.
Meanwhile an emotional video made by two other locals has gone viral on Facebook.
Sharing the video on his own social media pages, Buckingham admitted he was "involuntarily retching from the smell".
"The [Coalition parties] have been repeatedly warned by far west residents, community groups, scientists and Labor that their water policies would cause devastation on the Darling River".
But Mr Blair insists no one is getting water because of the prolonged drought.
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Interestingly, some the signals follow a repeating pattern, per Science News, so they don't appear to be random in nature . Cornell University's Shami Chatterjee, a fellow FRB researcher, agreed: "This field is about to break wide open".
NSW Primary Industries Minister Niall Blair - who has been savaged by some Menindee locals for partly blaming the drought - said in a statement that fish kills are not a new phenomenon and happened in the region between 2002 and 2004 during the millennium drought. "You can not dismiss the fact there is a drought and a lack of water".
The die-off has been associated with an algal bloom and "associated low dissolved oxygen event", meaning there isn't enough oxygen in the water for fish to breathe.
"The scale of this disaster is extraordinary and unprecedented". "We've spent decades and $13 billion only to end up with ecological tragedy in our rivers".
It's a serious issue: mass fish deaths in the Darling River at Menindee. "We welcome the investigation into the fish deaths by the NSW Department of Primary Industries and WaterNSW".
"They don't understand what it would mean [to cancel it]", Blair says, of the NSW Labor stance.
These events are isolated to the Darling River - all of MCA's production is based on the Murrumbidgee and Murray River Systems and we have sufficient allocation of high quality water. Some of them were up to 100 years old, the men said.
"Further upstream at Dirranbandi (home of Cubbie Cotton), just 300 hectares of cotton has been planted, which is 1 per cent of what can be planted in a very good season".
Australian National University honorary professor John Williams says the current Murray-Darling Basin Plan has "failed" and needs to be overhauled.