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Black Pearl Killifish

Argolebias nigripinnis

Freshwater South America Usually captive bred

A breathtaking annual killifish whose males display velvety blue-black flanks studded with iridescent cyan spots and broad fins. Adapted to temporary seasonal pools, they require cool water, soft acidic parameters, and live or frozen foods. Their natural lifespan is brief, often finishing within a single year.

Also called: Blackfin pearl killifish, Blackfin pearlfish, Black-finned pearl fish, Dwarf Argentine pearlfish, Killifish.

5 cm adult length, drawn to scale. torpedo body.

Try it in the planner Opens a tank sized to its minimum with 1 fish added.

What it needs

ItemValueBecause
Adult length 5 cm Used for the Space check: the tank must be long enough for the fish to turn round.
Smallest tank 40 L, at least 40 cm long estimated The least water and floor length this species is kept in for good, as a single fish or smallest group.
Extra water per added fish 5 L estimated What each further fish adds once the minimum is met.
Waste load Class 1 of 5 estimated How much waste an adult makes against its size. Feeds the Load check.
Temperature 16 to 22 C Stock sharing a tank need overlapping ranges.
pH 6 to 7.2 Compared with tankmates in the Water check.
Hardness GH 3 to 10, KH 1 to 5 Degrees of general and carbonate hardness.
Flow Low Low-flow fish are stressed in a strong current.
Light Dim Matched to the lighting class on the needs sheet.
Group size Single fish is fine Not a schooling species.
Temperament Peaceful Territorial: weak.
Swims in Middle water Fish that use different levels share a tank more easily.
Lifespan About 1 years A fish is a long commitment.
Experience Some experience helps A guide to how forgiving the species is of mistakes.
Jumps Yes Keep the tank covered.

Tags marked estimated are judged from the size and habits of the species rather than measured, so treat them as a sensible default.

Diet and tank layout

Black Pearl Killifish is an carnivore that swims in the middle of the tank. It is safe with plants. Give it plenty of cover.

Tankmates

Works with

Depends

Avoid

Compare any two fish on the compatibility page, or print the equipment for a stock on the needs sheet. How this is worked out: the method.