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The Southern Purple-spotted Gudgeon is a small, colourful freshwater fish with a distinct genetic conservation unit in the southern Murray–Darling Basin.

The Chowilla Floodplain covers 17,750 ha. The floodplain environment is undergoing a severe decline due to the reduction in frequency of flooding and impact of highly saline groundwater resulting in the death of long-lived vegetation, rising soil salinity and decreased breeding opportunities for floodplain fauna.

As part of a broader program to restore health to the pre-existing biodiversity of the Murray, the Murray-Darling Basin Authority is restoring fish passage along the Murray River from the sea to Hume Dam.