Nothobranchius

Nothobranchius eggersi is an annual killifish apparently endemic to the lower Rufiji in eastern Tanzania, including freshwater parts of the delta. It inhabits ephemeral pools and swamps on lowland floodplains that dry out for several months each year, and survives as eggs in the substrate. Many wild populations are in the hobby, labelled with collection codes to limit hybridisation, alongside aquarium strains labelled 'red' or 'blue'.

Nothobranchius foerschi is an annual killifish from eastern Tanzania that may be restricted to a small area of the Ruvu River catchment. All confirmed records come from the Ruvu and its delta, between Soga and the coast at Bagamoyo. It inhabits ephemeral pools and swamps on lowland floodplains, mostly heavily overgrown with terrestrial vegetation, and an aquarium strain appears more yellowish than the wild form.

Gunther's nothobranch, Nothobranchius guentheri, is an annual killifish endemic to Unguja, the main island of Zanzibar, Tanzania. It lives in seasonal coastal pools that dry out completely, surviving the dry season as eggs in the mud. One of the easier Nothobranchius to keep and breed, it is often recommended for a first attempt at an annual killifish. The IUCN lists it as Endangered because its pools are being lost to farming.

The bluefin nothobranch, Nothobranchius rachovii, is a killifish of seasonal pools and swamps in eastern Mozambique. Its habitats dry out for several months each year and the adults die, while the eggs survive in the substrate and hatch when the rains return. Northern and southern populations once included in it are now described as N. krysanovi and N. pienaari, and N. rachovii sensu stricto is restricted to the lower Pungwe and Zambezi basins.