Common carp have been introduced to most continents and some 59 countries.
In absence of natural predators or commercial fishing they may extensively alter their environments due to their reproductive rate and their feeding habit of grubbing through bottom sediments for food.
In feeding, they may destroy, uproot, disturb and eat submerged vegetation, causing serious damage to native duck, such as canvasbacks, and fish populations.

Carp were introduced to Australia over 100 years ago and, after spreading massively through the Murray–Darling basin, have established themselves in every Australian territory except for the Northern Territory.
In Victoria, the common carp has been declared a noxious fish species, and the quantity a fisher can take is unlimited.
In South Australia, it is an offence for this species to be released back to the wild.
An Australian company produces plant fertilizer from carp.

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 by deliberate exposing them to carp-specific koi herpes virus with its high mortality rate.
The CSIRO has 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.

Common carp were brought to the United States in 1831.
In the late 19th century, they were distributed widely throughout the country by the government as a food-fish, but they are now rarely eaten in the United States, where they are generally considered pests.
As in Australia, their introduction has been shown to have negative environmental consequences, and they are usually considered to be invasive species.

In Utah, the common carp's population in Utah Lake is expected to be reduced by 75 percent by using nets to catch millions of them, and either giving them to people who will eat them or processing them into fertilizer.
This, in turn, will give the declining population of the native June sucker a chance to recover.
Another method of control is to trap them with seine nets in tributaries they use to spawn, and exposing them to the piscicide rotenone.
This method has been shown to reduce their impact within 24 hours and greatly increase native vegetation and desirable fish species.
It also allows native fish to prey more easily on young carp.

Common carp are thought to have been introduced into the Canadian province of British Columbia from Washington state.
They were first noted in the Okanagan Valley in 1912, as was their rapid growth in population.
Carp are currently distributed in the lower Columbia (Arrow Lakes), lower Kootenay, Kettle (Christina Lake), and throughout the Okanagan system.

In 2020 scientists demonstrated that a small proportion of fertilized common carp eggs ingested by waterfowl survive passing through the digestive tract and hatch after being retrieved from the feces.
Birds exhibit strong preference for fish eggs, while cyprinids produce hundreds of thousands of eggs at a single spawning event.
These data indicate that despite the low proportion of eggs surviving the digestive tract of birds, endozoochory might provide a potentially overlooked dispersal mechanism of invasive cyprinid fish.
If proven under natural circumstances, endozoochorous dispersal of invasive fish could be a strong conservation concern for freshwater biodiversity.
Common carp have been introduced to most continents and some 59 countries. In absence of natural predators or commercial fishing they may extensively alter their environments due to their reproductive rate and their feeding habit of grubbing through bottom sediments for food. In feeding, they may destroy, uproot, disturb and eat submerged vegetation, causing serious damage to native duck, such as canvasbacks, and fish populations.
Carp were introduced to Australia over 100 years ago and, after spreading massively through the Murray–Darling basin, have established themselves in every Australian territory except for the Northern Territory. In Victoria, the common carp has been declared a noxious fish species, and the quantity a fisher can take is unlimited. In South Australia, it is an offence for this species to be released back to the wild. An Australian company produces plant fertilizer from carp.
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 by deliberate exposing them to carp-specific koi herpes virus with its high mortality rate. The CSIRO has 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.
Common carp were brought to the United States in 1831. In the late 19th century, they were distributed widely throughout the country by the government as a food-fish, but they are now rarely eaten in the United States, where they are generally considered pests. As in Australia, their introduction has been shown to have negative environmental consequences, and they are usually considered to be invasive species.
In Utah, the common carp's population in Utah Lake is expected to be reduced by 75 percent by using nets to catch millions of them, and either giving them to people who will eat them or processing them into fertilizer. This, in turn, will give the declining population of the native June sucker a chance to recover. Another method of control is to trap them with seine nets in tributaries they use to spawn, and exposing them to the piscicide rotenone. This method has been shown to reduce their impact within 24 hours and greatly increase native vegetation and desirable fish species. It also allows native fish to prey more easily on young carp.
Common carp are thought to have been introduced into the Canadian province of British Columbia from Washington state. They were first noted in the Okanagan Valley in 1912, as was their rapid growth in population. Carp are currently distributed in the lower Columbia (Arrow Lakes), lower Kootenay, Kettle (Christina Lake), and throughout the Okanagan system.
In 2020 scientists demonstrated that a small proportion of fertilized common carp eggs ingested by waterfowl survive passing through the digestive tract and hatch after being retrieved from the feces. Birds exhibit strong preference for fish eggs, while cyprinids produce hundreds of thousands of eggs at a single spawning event. These data indicate that despite the low proportion of eggs surviving the digestive tract of birds, endozoochory might provide a potentially overlooked dispersal mechanism of invasive cyprinid fish. If proven under natural circumstances, endozoochorous dispersal of invasive fish could be a strong conservation concern for freshwater biodiversity.
Common carp