Efforts to eradicate a small colony from Lake Crescent in Tasmania, without using chemicals, have been successful, but the long-term, expensive and intensive undertaking is an example of both the possibility and difficulty of safely removing the species once it is established. One proposal, regarded as environmentally questionable, is to control common carp numbers by deliberately exposing them to the carp-specific koi herpes virus with its high mortality rate. In 2016 the Australian Government announced plans to release this virus into the Murray-Darling basin in an attempt to reduce the number of invasive common carp in the water system. However in 2020 this plan was found to be unlikely to work. The CSIRO has also developed a technique for genetically modifying carp so that they only produce male offspring. This daughterless carp method shows promise for totally eradicating carp from Australia's waterways.