Swordtails are so named because the males have an elongated, sword-like tail. Like guppies and sailfin mollies, swordtails are small aquarium fish which have been released into geothermally heated waters. They are known in only one location – the Waipāhīhī Stream, which flows into Lake Taupō. However, a 1999 survey of the stream failed to find any, and so they may be extinct in the wild.
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Department of Primary Industries and Fisheries
by Glynn Aland
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09 February 2015