Barongarook Creek: 40 Tonnes of Dead Carp Removed, Screen Planned — Nov. 7, 2026

Information checked: November 7, 2026, 8:16 AM Australian Eastern Daylight Time (AEDT, UTC+11:00; Colac, Victoria), equivalent to November 6, 2026, 21:16 UTC. The timestamp reflects the verification of public information, not the date or time of the fish deaths or the scheduled publication time.

About 40 metric tons (40 tonnes, or approximately 40,000 kilograms) of dead carp have now been removed from Barongarook Creek in Colac, Victoria. In its November 6, 2026, public update, Colac Otway Shire Council said the cleanup concentrated on the creek sections nearest homes and built-up areas. Crews used a vacuum truck after a successful trial earlier in the week. Authorities have also announced plans for a temporary carp screen near Lake Colac to limit further carp entering the creek. The screen was announced as a next step, not confirmed as already installed.

This is primarily a response to a mass fish-death event, not evidence that officials have exterminated the creek’s entire living carp population. Low water flows and depleted dissolved oxygen during carp breeding season are the leading explanation given by local authorities. The cleanup has reduced the volume of decomposing fish, but some carcasses remain. Residents and visitors are being advised to avoid contact with affected water and dead or dying fish, and to keep animals away.

Destaques

• Removal total: Council reported roughly 40 tonnes of dead carp recovered by November 6, 2026; this is the quantity removed, not a verified count of every fish that died.
• Where: The cleanup reached sections south of Murray Street toward Wallace Street and north of Murray Street toward Lake Colac, prioritizing accessible areas near housing.
• Cause and action: Low flow and low dissolved oxygen are the working explanation. A vacuum truck was used, and a temporary screen near the lake is planned.
• Safety: Some fish remain. Avoid affected water and carcasses, prevent pets from entering, and report any new fish-death observations to EPA Victoria.

What is happening at Barongarook Creek in Colac?

The immediate problem is a large buildup of dead common carp in the creek that flows into Lake Colac. The accumulation brought visible carcasses and strong odors near places people live, walk and spend time. The first public council notice about the recent event was dated October 22. On November 2, authorities outlined a coordinated removal plan and tested a vacuum-based method. By November 6, council reported that about 40 tonnes had been collected and that the method had allowed crews to scale up the operation. These dates describe the evolving response; they do not establish that all fish died on one day.

According to the November 6 council update, collection took place south of Murray Street toward Wallace Street and to the north from Murray Street toward Lake Colac. The recovered carp went to Naroghid Landfill as organic material for composting alongside other organic waste. This is an officially reported disposal route, not a claim that the fish were suitable for eating or for people to handle themselves.

The work targeted accessible sections, especially near homes, rather than every stretch of the creek. Council has acknowledged that it could not reach every carcass. Remaining fish may decompose and continue to generate odor for a time. Residents looking for the current official status can consult Colac Otway Shire Council’s official news updates, where the council lists its November 2 and November 6 statements.

Why did thousands of carp die in Barongarook Creek?

Low dissolved oxygen, coupled with low flows during the breeding season, is the explanation authorities currently favor. Carp were thought to have moved from Lake Colac into Barongarook Creek to spawn. Where fish become heavily concentrated and water exchange is limited, there may not be enough oxygen in the water to sustain them. Decomposing organic material can also increase oxygen demand. This explains the concern about the creek’s water conditions without assuming an unverified industrial discharge or deliberate poisoning.

EPA Victoria lists low water levels, poor water quality, oxygen depletion, temperature changes and nutrient conditions among possible causes of fish-death events. The agency’s general guidance also explains that fish deaths can have natural or pollution-related causes, which must be assessed on the evidence rather than inferred from dead fish alone. See EPA Victoria’s fish-death and pollution reporting page. The local council’s language describes a likely naturally occurring event. It does not amount to a published, comprehensive biological count or proof that every individual fish died for exactly the same reason.

Questions about a carp virus have also surfaced in wider discussion of Australia’s invasive carp problem. There is no verified evidence that the November 2026 Barongarook Creek deaths resulted from an intentional release of a carp virus. National research into a possible carp-specific biological control continues, but that program is separate from this cleanup and requires scientific and regulatory assessments. The Australian Government describes those steps in the Australian Government’s Carp Biological Control Program.

How are crews removing the dead carp?

The local response used a specialist truck with suction equipment to draw accumulations of dead fish from practical-to-reach sections of the waterway. Council crews also collected dead fish from accessible public banks, while additional bins supported the management of the affected area. The vacuum method was first trialed on Monday, November 2, and proved effective enough to expand the operation over the following days.

The responsibilities are divided among several public agencies. Colac Otway Shire Council and Victoria’s Department of Energy, Environment and Climate Action (DEECA) have led work in the creek according to the land each manages. Corangamite Catchment Management Authority and EPA Victoria have provided technical and logistical support. Their cooperation does not imply that every agency is independently conducting a pollution investigation or that one agency alone controls the entire waterway.

In the November 6 update, council also announced a temporary carp screen near Lake Colac intended to prevent more carp moving from the lake into the creek. A screen may help reduce a further influx, but its effectiveness, installation timing, maintenance and impact on other aquatic species need to be assessed in practice. As of this verification, the announcement does not establish that the device is in service.

Is it safe to walk near Barongarook Creek or let pets into the water?

The council and EPA have specifically advised that people and animals should avoid contact with the affected creek water and any dead or dying fish. The precaution remains important even after much of the visible material has been removed. Do not allow dogs to drink or swim in affected sections, do not pick up decomposing carp, and do not treat fish found dead in this incident as food. Avoid the immediate work zones and follow signs or instructions issued on site.

That advice is not the same as an official declaration that every walking path or the entire creek reserve is closed. The council’s general information identifies a walking track between Lake Colac and Murray Street and public spaces along the creek, but this verification did not establish a blanket closure notice for those facilities. Before visiting, check the latest council updates and obey any temporary barriers or crew instructions. The creek’s location, approximately 13-kilometer course, and its route through Hugh Murray Reserve and Sculpture Park are described in the council’s Barongarook Creek guide.

If you notice a fresh cluster of dead fish, unusual water discoloration, signs of a chemical spill, or another concerning change, report the location and time rather than attempting an individual cleanup. EPA Victoria accepts water-pollution and fish-death reports online or through its 24-hour hotline, 1300 372 842. Include the approximate number of fish, conditions, odor and any wildlife affected if you can observe them safely from a distance. The reporting instructions are on EPA Victoria’s fish-death and pollution reporting page. For council-managed public areas, the council contact page supplies local contact details.

Why are carp a long-term problem for Lake Colac?

Common carp are an invasive freshwater fish. Their feeding behavior can disturb sediment, cloud water, damage aquatic vegetation and make it harder for some native species to thrive. These are documented reasons for managing carp populations; they do not mean that a mass fish death is automatically beneficial for creek health. Large amounts of decaying biomass and lower oxygen levels can create additional stress for an already affected ecosystem.

The Australian Government explains that carp are widespread, reproduce rapidly when conditions suit them, and are difficult to eliminate with a single method. Management tools may include targeted capture, barriers, trapping, restoration work and research into biological controls. Its the National Carp Control Plan describes why effective management generally requires multiple approaches, while its broader the Australian Government’s Carp Biological Control Program sets out why any proposed virus-based strategy is still subject to testing and approvals.

Barongarook Creek also has a separate environmental restoration program, GreenLinks, that includes weed control and replanting indigenous vegetation. Such work can support the creek’s longer-term habitat quality, but it should not be described as a direct remedy for the November carp deaths or as proof that oxygen conditions have recovered. Project details are available on the Barongarook Creek GreenLinks project.

What happens next for Colac and Barongarook Creek?

The most immediate announced next step is installation of the temporary screen near Lake Colac, alongside management of the affected areas and any remaining odors. The authorities have also signaled broader consideration of carp population management and the resilience of Lake Colac and nearby waterways. No verified date for full ecological recovery, final carp mortality tally, or permanent eradication program was identified in the official materials checked for this article.

For residents, the useful distinction is between three stages: removal of dead fish has substantially progressed; limiting new carp entry is planned; long-term population control remains a more complicated question. Any future announcement about the screen’s completion, further removal totals, water-quality testing or reopening of a specific affected area should be checked against the relevant public agency’s latest notice before being treated as confirmed.

FAQ: Barongarook Creek carp removal

How many dead carp have been removed from Barongarook Creek?

Colac Otway Shire Council reported approximately 40 metric tons (40 tonnes, about 40,000 kilograms) removed by November 6, 2026. That figure is the recovered weight, not the total weight of all fish that died.

What caused the carp deaths in Colac?

Authorities' leading explanation is low dissolved oxygen and low water flow during the carp breeding season. A deliberate poisoning incident or carp virus release has not been verified as the cause.

Can people or pets safely enter the affected creek water?

No. Council and EPA advice is to avoid the affected water and dead or dying fish and keep pets away. Check Colac Otway Shire Council’s official news updates for any updated local instructions.