Southern Aphyosemion

Aphyosemion australe

Photo of aquarium fish Southern Aphyosemion
Natural range
  • Gabon area
  • Ogooué River Delta
KillifishConservation status: Least concern LC

Family:Nothobranchiidae

Other scientific names: Aphyosemion calliurus, Aphyosemion hjerresensii, Aphyosemion polychromum, Aphysemion australe, Haplochilus calliurus, Panchax polychromus

The Southern Aphyosemion, also known as the “Golden Pheasant” (scientific name Aphyosemion australe), is a representative of the family Nothobranchiidae. This fish was one of the first killifish to gain popularity in aquaristics due to its unpretentiousness, vibrant coloration, ease of breeding, and peaceful nature. The combination of these qualities makes it an excellent choice for beginner aquarists.

Required aquarium volume
40 L
Size in aquarium
6 cm
Temperature
21 – 32 °C
Temperament
Peaceful (regular)
Parameters
Temperature21 – 32 °C
Water pHSlightly acidic (5.5) – Neutral (7)
Water dHSoft (5) – Medium hardness (10)
Water salinityno salt (freshwater)
Size in aquarium6 cm
Lifespan3 years
TemperamentPeaceful (regular)
Toward small fishnot a predator
Required aquarium volume40 L
Lightingdimmed
Substratesandy (regular, light)
Water flowmoderate or strong
FeedingAny (universal)
CarePair (male/female)

Frequently asked questions

The essentials: size, tank volume, water parameters and care

How big does Southern Aphyosemion get?

An adult reaches 6 cm in length. Plan the tank around the maximum size: the fish quickly outgrows a cramped setup.

What size aquarium does Southern Aphyosemion need?

The minimum recommended volume is 40 L. A smaller tank speeds up nitrate build-up and raises stress levels.

What water parameters does Southern Aphyosemion need?

Temperature 21–32 °C, pH 5.5–7, hardness 5–10 dGH. Stability matters more than exact values: sudden swings are harder on the fish than a small deviation from the ideal.

How long does Southern Aphyosemion live?

Around 3 years when kept properly. Lifespan depends directly on tank volume, water quality and a varied diet.

Is Southern Aphyosemion aggressive?

Temperament: peaceful (regular). Keep this in mind when choosing tank mates.

How many Southern Aphyosemion should be kept together?

Recommended setup: pair (male/female). Ignoring this is a common cause of stress and disease.

What does Southern Aphyosemion eat?

Diet type: any (universal). Feed small portions that are finished within a couple of minutes — overfeeding does more harm than underfeeding.

What is the scientific name of Southern Aphyosemion?

The scientific name of the species is Aphyosemion australe, family Nothobranchiidae. It also appears in the literature as: Aphyosemion calliurus, Aphyosemion hjerresensii, Aphyosemion polychromum.

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