Ravenswood fish death investigation complete
Released 15 Jun 2017
The Department of Water has completed its investigation into recent reports of dead fish in the Murray River near Ravenswood, from Murray Bend to Rodoreda Crescent.
Approximately 300 black bream are estimated to have died on Friday 9 June 2017.
Departmental officers conducted onsite water testing and collected water samples for further laboratory testing.
Officers determined that the fish at the site were not suitable for autopsy.
The water testing results and monitoring this week indicate that the fish died as a result of low oxygen due to cooled surface waters.
In this case, as the surface waters have cooled, the temperature change caused the movement of very low oxygen waters and sediments at the bottom of the system. This led to bubbles of hydrogen sulphide gas being released, which in turn reduced the oxygen available to fish. This process is colloquially known as a ‘burp’.
This investigation is now complete and any previous warnings have been lifted.
The department greatly appreciates the support and assistance of the community and encourages people to report any fish deaths to the Department of Fisheries’ FishWatch on 1800 815 507.
Contact: Sarah Lau
Phone: (08) 6364 7549 / 0414 507 739