The eastern mosquitofish (Gambusia holbrooki) was introduced to Australia in 1925, and has since spread from the northeast coasts to New South Wales, southern Australia, and parts of Western Australia by 1934. Currently, known populations of wild mosquitofish occur in every state and territory except the Northern Territory, and are found in swamps, lakes, billabongs, thermal springs, salt lakes, and ornamental ponds. Mosquitofish are considered a noxious pest, especially in New South Wales and Queensland, and it is illegal to release them into the wild or transport them live into any of the states or territories. Mosquitofish were introduced by military and local councils to control mosquito populations, however there has been no evidence that Gambusia has had any effect in controlling mos