Endangered
Redtail notho
Nothobranchius guentheri
Redtail notho is a killifish in the family Nothobranchiidae (order Cyprinodontiformes) — Nothobranchius guentheri, recorded as Endangered.
Appearance
During the dry season when the temporary pools of water the fish inhabit dry up and the adult fish perish, specially adapted proteins in the eggshell or chorion are triggered to retain moisture, thereby ensuring the next generation of fish last until the rains return and the fry can hatch. Once the fry detect a change in pressure (due to being submerged again), and an increase in dissolved carbon dioxide concentration, an enzyme, chorionase is released to soften the eggshell and allow the fish to hatch.
Range and habitat
Its natural habitats are intermittent rivers and intermittent freshwater marshes.
Pins are Wikidata “endemic to” fields. Orange dots, when present, are GBIF occurrence tiles — survey bias included.
Breeding
As with other "peat spawner" killifish, pairs or small groups spawn by repeatedly pushing into the substrate and releasing and fertilising a single egg.
In crisis
Redtail notho is Endangered on this catalog because that is the IUCN category stored on Wikidata. Confirm the official criteria and any later count on iucnredlist.org.
Sources
Written for this catalog from the English Wikipedia article on Redtail notho, Wikidata item Q2670335. Family and order context is original field-guide writing about the group, not a copied assessment of this one species. Wikipedia text is CC BY-SA. Not an IUCN assessment. Counts, when quoted, can change — confirm them on the recovery programme and on iucnredlist.org.
