Fisheries officials said they were on their way to Menindee, a small outback town in far-west New South Wales state, after the third mass fish kill in the area in less than two months.
"The conditions out there are showing a lot of fish that are near the surface of the water gasping for air".
"It's started again", Mr McCrabb said.
Thousands of fish have washed up dead on the Darling River. Meanwhile the Water Minister is trying to bury critical reports, cover up mismanagement & blame drought.
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The state government has installed aerators in some waterways to keep the levels of oxygen up for fish, but Regional Water Minister Niall Blair said it was fresh water that was ultimately needed for them to survive.
"Reports from the area indicate the event has affected large numbers of bony bream and smaller numbers of other species", the statement read.
A spokeswoman for the NSW Department of Primary Industries said fisheries officers had been deployed to investigate the deaths in the Menindee weir pool.
The previous two kills came as a result of blue-green algal blooms, which stripped the water of oxygen, according to the ABC.
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Year to year, since Pendleton first came to the island in 2005, he has seen ice gradually retreating from the edge of the ice cap. Pendleton and others collected samples from around 30 ice caps and conducted radiocarbon dating to determine their age.
"It is likely linked to some rain and cooler temperatures in the Menindee area following an extended period of very hot weather", a department spokesperson said.
Up to a million fish died at Menindee earlier in January, some of them decades old, while thousands were found dead days later nearly 900km away along the Macintyre River.
A Bureau of Meteorology spokesman told AAP temperatures at Menindee peaked at 48.8C on Friday, falling to 23.3C on Sunday, but said "that's not unusual for this time of year".
"Unfortunately though, we're expecting the conditions to potentially continue to deteriorate", he told reporters on Monday.
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The council has hired a clean-up operator which will also record information about the event.