The Lyretail Killifish (Aphyosemion australe) has been captivating aquarists since it first appeared in the hobby in the early twentieth century. A fixture of killifish collections around the world, it remains one of the most sought-after African killifish for its spectacular appearance and manageable care requirements. It is native to the coastal lowland forests of Gabon, southern Cameroon, and northern Congo, where it inhabits cool, shaded forest streams and swamps carpeted in leaf litter and decaying plant matter.
The male's finnage is the defining feature: the caudal fin extends into long, flowing lobes top and bottom — the lyre shape from which it takes its common name. The body is adorned in a base of rich orange-brown overlaid with a fine scatter of red and blue spots and streaks, with iridescent blue-green accents on the gill covers and flanks. Females are plainer in brown with less pronounced spotting, as is typical in this genus.
Aphyosemion australe is a non-annual killifish — it does not require a dry season for egg development and can live for 2–3 years under good conditions. This makes it significantly more straightforward than annual killifish species. Eggs are deposited among fine plants or spawning mops and hatch in 2–3 weeks without a diapause requirement, simplifying the breeding process considerably.
Cool, clean water and a varied diet of small live and frozen foods are the keys to maintaining this species at its best. Its preference for cooler temperatures sets it apart from many tropical species and requires attention to summer tank temperature management.
