The Murray Darling Basin Authority’s 2025 Sustainable Rivers Audit contains bad news on the region’s native fish.
Less than half of the expected 14 native fish species were found in the Castlereagh Valley over the last five years, and only nine of the 19 species expected to occur in the regulated Macquarie Valley (which includes the Bogan and Macquarie Rivers) were detected.
The decline in the health of native fish populations in these valleys echoes broader declines across the Murray-Darling Basin over many decades.
The Audit, released in July, reveals . . .
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