Blackfin Pearl Killifish Care Guide
Austrolebias nigripinnis · Freshwater Fish
What Blackfin Pearl Killifish look like
The Blackfin Pearl Killifish (Austrolebias nigripinnis) exhibits a diminutive, elongated body that typically reaches a maximum adult size of approximately 2-2.5 inches (5-6.5 cm). Males are particularly striking, characterized by a dark blue to black body adorned with rows of iridescent pearly-white to light blue spots, creating a visually arresting contrast. The fins are predominantly dark, contributing to the species' common name 'nigripinnis' which translates to 'black fins'. This species possesses a laterally compressed body shape, which aids in maneuverability within its shallow, seasonal aquatic habitats. Notably, the Blackfin Pearl Killifish lacks a swim bladder, a common adaptation among annual killifish that allows it to thrive in ephemeral water bodies. The presence of a lateral line system is evident, providing sensory input to detect vibrations in the water, essential for both foraging and predator avoidance.
Behavior & temperament
Austrolebias nigripinnis is primarily a solitary species, although it may exhibit loose aggregations during breeding periods. It inhabits shallow, ephemeral pools, typically dwelling in the upper water column where it can easily access both prey and potential mates. The breeding behavior is characterized by egg scattering, with females depositing eggs among aquatic vegetation. Males display territorial behaviors during the breeding season, showcasing their vibrant coloration to attract females while defending their chosen nesting sites. The species exhibits a generally peaceful temperament, though males can display aggression towards one another when competing for mates or territory.
Diet & feeding
In the wild, the Blackfin Pearl Killifish is an omnivore, feeding on a varied diet that includes small invertebrates, algae, and detritus. In captivity, it thrives on a balanced diet of high-quality flake food, supplemented with live or frozen foods such as brine shrimp and daphnia to meet its nutritional needs.
Behind the name
Austrolebias (southern balance; from 'australis' meaning southern and 'lebias' from Greek 'lebias' meaning fish); nigripinnis (black fins; from 'niger' meaning black and 'pinnis' meaning fins).
Plan your tank
Check the numbers before you buy: tank volume, a stocking plan, cycle progress, water changes, and your ongoing care routine.
Keeping Blackfin Pearl Killifish?
AquaLens identifies your fish and plants from a photo, tracks water chemistry, and flags health issues early — free on iOS and Android.
