Scientists say the Murray cod has disappeared from parts of the Darling-Baaka River and bringing it back may not be possible.
The fish are being monitored by the a Commonwealth Environmental Water Office Monitoring, Evaluation and Research program that looks at how river environments respond to water for the environment.
Dr Frazier said the impact of introduced carp, the removal of habitat which fish used to breed in the river, the presence of weirs that obstructed fish migration, overfishing and poor water quality had impacted the species.He said he expected to see the numbers rise in the most recent survey survey given there had been a couple of wet years, but was alarmed when that didn't happen.
"They're not mobile, they can move a bit but they tend to have home patches, so they're susceptible during events like the last drought which dries everything out," he said.But Dr Frazier said the species could be saved. Fisheries data analysed by the NSW Department of Primary Industries suggests the number has improved over the past two decades but some areas remain critical.
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