A term used in Australia and New Zealand to refer to Gambusia, a common variety of which is the Western Mosquitofish. These small, hardy, viviparous fish were introduced around the world in the early 1900s to control mosquitos. In many instances, they ended up ignoring mosquitos and focusing on the eggs and fry of native fish. Many species of Australian rainbow fish have been endangered by Gambusia and efforts are underway to erradicate them, primarily in Queensland.

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