BALRANALD Shire Council has confirmed reports of a fish kill at the Redbank Weir in the Murrumbidgee River.
Up to 2000 dead fish were reported in a section of the lower Murrumbidgee River, upstream from Balranald on Tuesday.
Carp and native perch have been identified as the main species affected, along with a small number of native bony bream and Murray cod.
The fish kills were reportedly restricted to the stillwater immediately upstream of Redbank Weir.
Council said it is working with state and federal agencies to prevent or minimise further fish kills, with fish refuge flows using environmental water currently being provided to the lower Murrumbidgee River.
General manager Michael Kitzelmann said these water deliveries would "provide important refuges for native fish and promote movement of fish and other aquatic animals to refuge areas".
Community members are encouraged to report any similar incidents or observations to Fishers Watch Phoneline: 1800 043 536.
Full coverage in Friday's Guardian.