Maori name for Geotriachilensis, Gray, a New Zealand Lamprey (q.v.).
1845. E. J. Wakefield, `Adventures in New Zealand,' vol.ii. p. 15:
«We procured an abundant supply of piarau, a `lamprey,' whichis taken in large numbers in this river, and some others in theneighbourhood, when the waters are swollen.»