Least Killifish (Heterandria formosa)

Scientific Name(s): Heterandria formosa

 

Common Name(s): Formosa Livebearer, Least Killifish, Dwarf Top Minnow, Dwarf Livebearer

 

Family: Poeciliidae

 

Species Type: Livebearers

 

Maximum Size: 1.5 inches

 

Life Span: 3 years

 

Natural Habitat: North American rivers and streams

 

Minimum Tank Size: 10 gallons

 

Tank Region: All over.

 

Possible Tank Mates: Other community fish

 

Description: This species is native to North America and can be a great fish to use in a native community tank. These fish are small and slender and have a very low bioload. The fish is colored black silver and green, but a golden variety is also becoming available.

 

Temperature Range 67°F - 80°F

60°F

65°F

70°F

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80°F

85°F

90°F

 

pH Range 6.8 - 8.2

pH 5.0

pH 6.0

pH 7.0

pH 8.0

pH 9.0

 

Hardness 5° - 20°

0°

10°

20°

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40°

 

Breeding Information: The Least Killifish is a prolific breeder. If you mix males and females they will reproduce. While the least killifish will eat fry, it is not particularly good at catching the fry.

 

Sexing Information: Females tend to be larger and rounder. Males have longer gonopodiums.

 

Diet: Does well with flake food

 

Temperment: Peaceful

 

Common Diseases: None specific to species.

 

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Least Killifish (Heterandria formosa)