The black flounder (Rhombosolea retiaria) is one of two species of freshwater fish that are derived directly from marine species. The other is the torrentfish (Cheimarrichthys fosteri). The black flounder is most common in the sea, in estuaries, harbours and lower levels of rivers, but it has been seen 250 kilometres up the Whanganui River, and 100 kilometres up the Manawatū River.
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Department of Conservation
Photograph by W. Farelly
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