Aphyosemion australe gold - Killifish

Overview and Introduction

The Aphyosemion australe gold (Aphyosemion australe) is a striking golden form of the Cape Lopez killifish, prized for its elegant finnage, peaceful nature, and compact size.

Whether you're an experienced aquarist or just starting your fishkeeping journey, the Aphyosemion australe gold offers a rewarding addition to a well-maintained community aquarium.

Appearance and Colouration

The Aphyosemion australe gold typically reaches an adult size of around 3.5 cm, making it well-suited to medium-sized community aquariums. The species displays subtle but attractive natural colouration, which becomes more vibrant when maintained in optimal conditions.

Best colours are achieved through a varied diet, stable water chemistry, and a well-planted aquarium.

Native Environment

In the wild, Aphyosemion australe is found in Coastal streams and swampy habitats of Gabon and southern Cameroon, West-Central Africa. These fish typically inhabit slow-moving tributaries, forest streams, and floodplain pools where water is soft, warm, and often stained with tannins from decaying organic matter.

The natural environment of the Aphyosemion australe gold features dense aquatic vegetation, submerged roots, and leaf litter, creating a complex habitat with dappled light and plenty of hiding spaces. Replicating these conditions in the home aquarium helps reduce stress and encourages natural behaviour.

Tank Setup Guidelines

A minimum aquarium volume of 20 litres is recommended for a small group of Aphyosemion australe gold. Provide a well-planted layout with open swimming areas, subdued lighting, and a dark substrate to help the fish feel secure and display their best colours.

Include plenty of live plants (such as Java Fern, Anubias, or Amazon Sword), driftwood, and smooth rocks to create a naturalistic environment. Efficient filtration is essential, but avoid strong currents; gentle water movement mimics the calm waters these fish prefer in the wild.

A secure aquarium lid is important. Regular partial water changes and stable conditions are key to long-term health and vitality.

Maintaining Water Chemistry

The Aphyosemion australe gold thrives in water temperatures between 22-26C, with a pH range of 6.0-7.2. Soft to moderately soft water is preferred, and the addition of natural tannins (via catappa leaves or driftwood) can help replicate wild conditions and support overall health.

Maintain excellent water quality through regular testing and partial water changes (20-30% weekly is a good guideline). Ammonia and nitrite should always be zero, and nitrate levels kept low through diligent aquarium maintenance and efficient biological filtration.

Avoid sudden fluctuations in temperature or chemistry, as stability is more important than hitting exact parameter targets. Acclimatise new fish slowly using the drip method to minimise stress and reduce the risk of shock.

Feeding and Nutrition

As a carnivore, the Aphyosemion australe gold requires a varied and balanced diet to maintain vibrant colours and robust health. Offer small live and frozen foods such as daphnia, brine shrimp, bloodworms and mosquito larvae. These fish will also accept quality micro-pellets or flakes, but live and frozen foods help maintain colour and condition.

Feed small portions two to three times daily, offering only what can be consumed within a few minutes to prevent water quality degradation. A varied diet not only enhances colour and condition but also supports the immune system and encourages natural foraging behaviour.

High-quality commercial foods formulated for small tropical fish provide a solid foundation, but regular supplementation with live or frozen foods will bring out the best in this species.

Natural Behaviour Patterns

These fish are active swimmers that occupy the mid to upper levels of the aquarium, where they forage and explore. Their natural behaviour is most evident in a well-planted tank with gentle lighting and calm water flow.

Compatible Tank Mates

The Aphyosemion australe gold is an excellent choice for a peaceful community aquarium. Keep them in a species-only aquarium or with very small, peaceful tank mates that will not outcompete them for food. Small shrimp require caution. Any companions should share comparable water parameter requirements.

Avoid housing with large or boisterous fish, fin-nippers, aggressive cichlids, or any fish large or aggressive enough to intimidate or prey upon this species. Peaceful invertebrates such as small shrimp and snails can also coexist safely, though very small shrimp fry may occasionally be eaten.

Always research the specific needs and temperament of any prospective tank mates before introduction, and ensure the aquarium is large enough to accommodate all inhabitants comfortably.

Spawning Behaviour and Fry Care

Breeding the Aphyosemion australe gold in the home aquarium is possible but may require specific conditions and careful preparation. This killifish can be bred in a small pair setup with fine-leaved plants or spawning mops. Eggs are usually laid among plants or mops and can be incubated separately...

A separate breeding tank with soft, slightly acidic water and fine-leaved plants or spawning mops will encourage spawning. Condition prospective parents with high-quality live and frozen foods to bring them into peak breeding condition.

Fry are tiny and require very small live foods such as infusoria or commercial liquid fry food initially, graduating to freshly hatched brine shrimp as they grow. Patience, attention to water quality, and careful feeding are essential for success.

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