The sailfin molly occurs in large numbers in geothermally heated swamps around the southern shores of Lake Taupō. These fish are native to southern North America, and have been in New Zealand since the 1960s. The species is named after the large dorsal fin, which is more pronounced in males. They can reach 12 centimetres in length, but more commonly grow to 6–7 centimetres.
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United States Geological Survey (USGS)
Photograph by Noel Burkhead
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