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Published on 22 October 2026
A fish death event affecting Barongarook Creek in Colac is being investigated by Council and relevant agencies. Preliminary findings indicate low dissolved oxygen levels are the likely cause.
The event was first reported on 21 October and is primarily located on Barongarook Creek near Bromfield Street, extending through sections of the creek corridor.
“Council has been removing dead fish from Council-managed public land where there is an impact to public amenity,” Council’s General Manager Infrastructure and Environment Doug McNeill said.
“Council has been coordinating with relevant agencies on the wider clean up and to monitor the situation.”
Fish death events can occur naturally during periods of poor water quality including when dissolved oxygen levels in waterways become critically low.
“Unfortunately, more fish deaths are likely to occur over coming days. The combination of warm temperatures, low water flows and limited rainfall means oxygen levels in the creek may remain very low,” Mr Mc Neill said.
“Until a significant rainfall event occurs and fresh water enters the creek system, conditions are not likely to improve and residents may continue to observe dead fish in the creek.
“We understand that residents may be concerned about the number of fish affected. We appreciate the community’s patience while we and relevant agencies manage the situation.”