Heterandria formosa (Girard, 1859)
Least killifish
Heterandria formosa
photo by Slaboch, R.

Family:  Poeciliidae (Poeciliids), subfamily: Poeciliinae
Max. size:  3.6 cm TL (male/unsexed)
Environment:  benthopelagic; freshwater; brackish; pH range: 7 - 8; dH range: 9 - 19, non-migratory
Distribution:  North America: occurs only in the USA from Cape Fear River drainage in North Carolina to southern Louisiana.
Biology:  Adults inhabit heavily vegetated standing to slow-flowing fresh and brackish water. They feed on worms, crustaceans and plant matter (Ref. 7020). A truly viviparous fish (Ref. 45952).
IUCN Red List Status: Least Concern (LC); Date assessed: 14 February 2012 Ref. (126983)
Threat to humans:  harmless

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