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Australia Considers Controversial Virus to Combat Exploding Carp Population
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A potential biological solution is gaining traction in Australia as authorities grapple with a carp population spiraling out of control, reaching what experts describe as plague proportions. Conservationists and invasive species specialists are increasingly urging the federal government to approve the release of the cyprinid herpesvirus-3, a virus capable of reducing carp numbers by as much as 60 percent, though concerns remain about potential ecological consequences.
The escalating crisis has prompted calls for decisive action,with the Victorian Fisheries Authority (VFA) publicly supporting the virus’s deployment. “With carp numbers at an all-time high,they are seriously impacting our native fish and rivers,and wetlands and recreational fisheries,” a VFA spokesperson told Yahoo News Australia. The VFA further advocates for carp to be officially recognized as a key threatening process, mirroring the designation given to rabbits and foxes, which woudl unlock national threat abatement plans.
The Destructive Impact of an Invasive Species
Carp are now considered a noxious aquatic pest across the country, subject to strict regulations prohibiting their return to waterways or keeping without a permit. Their dominance is particularly pronounced in the Murray-Darling Basin, spanning Queensland, New South Wales, Victoria, South Australia, and the Australian Capital Territory, where they are estimated to comprise up to 90 percent of total fish biomass.
introduced in the mid-1800s as ornamental fish, the carp population exploded following the release of the “Boolara strain” into Victorian waters in the 1960s. Their feeding behavior – sucking and disturbing sediments – has devastating effects on aquatic ecosystems. This process muddies the water, uproots vegetation, diminishes water clarity, and releases nutrients that trigger harmful algal blooms. Consequently,native fish and plant life struggle to survive,while carp thrive in the degraded conditions,leading to poorer water quality and diminished habitats. Current estimates place the Australian carp population between just below 200 million and up to 1 billion.
River Communities Demand Action
Frustration is mounting among communities reliant on the River Murray in South Australia. Councils representing Berri Barmera, Renmark Paringa, and Loxton Waikerie are spearheading a renewed campaign to secure federal funding and commitment to the National Carp Control Plan (NCCP).
The NCCP, commissioned in 2016, finalized in 2019, and publicly released in 2022, extensively investigated the viability of using the Cyprinid herpesvirus 3 to control carp numbers. While the plan identified the potential for significant population reduction, it also highlighted potential drawbacks, including mass fish kills, water quality issues, impacts on native species, and considerable cleanup costs.
Balancing Risk and Reward
One of the key challenges in controlling carp lies in their prolific breeding capacity.”A female can typically spawn 300,000 eggs at a time and spawn more than once a year,” explained Dr.Carol Booth, policy director at the Invasive Species Council. The NCCP itself concluded that the virus “offers a potential, if partial, solution to a hitherto intractable problem,” recommending a combined approach of harvesting and biocontrol for effective population suppression.
The Murray Darling Association (MDA) is coordinating a unified response, urging the federal government to fund and implement the NCCP. In a letter to Agriculture Minister Julie Collins, the MDA emphasized the
