Austrofundulus limnaeus Care Guide
Austrofundulus limnaeus is an annual killifish from Venezuelan pools, famous for embryos that survive desiccation and total anoxia.
Overview
Austrofundulus limnaeus is an annual killifish of the family Rivulidae from northern South America. It completes its life cycle within a single year and is widely used as a research model because its embryos tolerate extreme environmental stress. FishBase records a maximum total length of about 8 cm.
Taxonomy
- Family: Rivulidae
- Genus: Austrofundulus
- Scientific name: Austrofundulus limnaeus
Habitat
The species inhabits ephemeral ponds in northern Venezuela, recorded by FishBase from the Maracaibo Lake basin. Research describes these pools as undergoing daily temperature swings and seasonal desiccation, anoxia and hypoxia. Adult fish cannot survive the dry season, so populations persist only through drought-tolerant embryos buried in the pond sediment.
Tank requirements
- Minimum tank volume: 60 L
- Temperature: 22-28 °C (72-82 °F)
- pH: 6.0-7.5
- GH: 5-15 °dGH
- Lifespan: 1-2 years
- Setup: peat substrate for spawning, low flow
Diet
The species is a carnivore, assigned a trophic level near 3.3 by FishBase. In aquaria it takes live and frozen foods such as bloodworm, Daphnia and Artemia, suited to its predatory feeding style.
Compatibility
Austrofundulus limnaeus is a robust killifish usually kept as a single species in pairs or harems rather than in mixed communities. It should not be combined with aggressive fish that would harass it or compete for food.
Breeding
This is an egg-burying annual killifish; FishBase describes it as a bottom spawner with an incubation period of 4-6 months. The eggs can undergo diapause at up to three distinct stages of development (diapause I, II and III). Diapause II is the most stress-resistant stage, and research reports that diapausing embryos have the highest known tolerance to anoxia of any vertebrate once temperature is taken into account, surviving months without oxygen and resisting desiccation in the sediment until the rains return.
Conservation status
IUCN Red List: Not Evaluated (per FishBase).