Pira-nu by A book of creatures.
The Pira-nu, meaning “black fish” in Guaraní, is a formidable aquatic creature of Argentinian riverine folklore. Said to originate from old timber canoes abandoned or destroyed in the rapids, the Pira-nu is not merely a beast, but a haunting symbol of drowned memories and forgotten journeys.
It is described as a massive fish with a horse-like head, complete with large, staring eyes and scissor-like teeth - not the flat molars of a grazing animal, but the sharp incisors of a flesh-ripper. This unsettling contradiction between its herbivorous-looking skull and its carnivorous habits is one of the many reasons locals fear it. The Pira-nu cruises the surface of rivers, appearing almost like driftwood, before ramming and capsizing canoes, dragging down the unfortunate occupants - be they human or livestock.
Its birth in decaying vessels is seen as a transformation of man-made objects into natural vengeance, turning remnants of human travel into something untamed and predatory. It is especially feared by fishermen and traders, who see its appearance as a bad omen or a punishment for neglecting traditional river rites.
Over time, the Pira-nu becomes stronger, not only physically but also resistant to magical rites, prayers, and even physical weapons. Elders claim that the oldest Pira-nu can only be repelled - not killed - by trickery or sacrifice.
References:[]
- Ambrosetti, J. B. (1917) Supersticiones y Leyendas. La Cultura Argentina, Buenos Aires.
- https://mitosyleyendas.idoneos.com/bestiario_mitologico/pira-hu/