Blackfin Pearl Killifish

How to care Blackfin Pearl Killifish

The Blackfin Pearl Killifish (Austrolebias nigripinnis) is a captivating species native to the temporary waters of Argentina and Uruguay. These annual killifish are renowned for their vibrant colors and unique reproductive strategies.

Appearance and Behavior

Males exhibit striking coloration with iridescent blue-black fins and a metallic greenish overlay on the pectorals. Females are more subdued in color. Both sexes have elongated bodies and fins, characteristic of killifish. They are active swimmers, often inhabiting the middle to upper levels of the aquarium.

Habitat Requirements

In their natural environment, Blackfin Pearl Killifish inhabit shallow, temporary pools and swamps with muddy bottoms and turbid waters rich in plankton. These habitats are subject to seasonal drying, leading to the death of adult fish. However, their eggs remain dormant in the mud, hatching with the onset of the next rainy season, ensuring the continuation of the species.

To replicate these conditions in an aquarium, provide a well-planted tank with a fine substrate. Incorporate floating plants to mimic the natural environment and offer hiding spots. A gentle filtration system is recommended to maintain water quality without creating strong currents.

Water Parameters

Maintain water conditions with a pH of 6.5-8.0, a temperature range of 75-85°F (24-29°C), and water hardness between 8-15 dGH. As a brackish water species, an SG of 1.005-1.015 is essential. Gradual acclimation is necessary when transitioning from freshwater to brackish conditions.

Diet

The Blackfin Pearl Killifish is an omnivorous feeder, consuming small invertebrates, algae, plankton, and worms. Provide high-quality flakes, live or frozen foods such as brine shrimp, daphnia, and bloodworms to ensure a balanced diet.

Breeding

Males display brighter colors to attract females, who lay eggs on plants or fine substrates. The fry can be raised on infusoria or finely crushed flakes. The lifespan of 1 year means that these fish are relatively short-lived, but their lively personalities and striking appearance more than make up for it.

Conservation Status

While not currently listed as endangered, the Blackfin Pearl Killifish's reliance on temporary water bodies makes it susceptible to habitat destruction and climate change. Conservation efforts are essential to protect their natural habitats and ensure the species' survival.

For a visual overview and more information on the Blackfin Pearl Killifish, you might find the following video helpful:

Austrolebias nigripinnis - Argentine Pearl Killifish