Species FishLeast Killifish

Least Killifish

Heterandria formosa

CommonFish
Illustration of Least Killifish (Heterandria formosa)

The Least Killifish is one of the smallest fish species, measuring only about 2.5 cm in length. It is notable for its delicate appearance and vibrant colors.

Habitat
Prefers shallow freshwater habitats such as swamps and marshes.
Diet
Feeds on small invertebrates and detritus.
How common
Common

Recent Least Killifish sightings near you

Live, research-grade observations from iNaturalist. Allow location to center the map on you.

Spotted a Least Killifish?

Point Huck at any plant, bird, or animal and know for sure - plus a live map of where it is being spotted near you.

Get Huck - free
5,300+species
63national parks
50states

More fish

Lei Triggerfish
Lei Triggerfish
Sufflamen bursa
Lemon Damsel
Lemon Damsel
Pomacentrus moluccensis
Lemon Shark
Lemon Shark
Negaprion brevirostris
Leopard Coralgrouper
Leopard Coralgrouper
Plectropomus leopardus
Leopard Shark
Leopard Shark
Triakis semifasciata
Lined Bristletooth
Lined Bristletooth
Ctenochaetus striatus
Lined Butterflyfish
Lined Butterflyfish
Chaetodon lineolatus
Lined Monocle Bream
Lined Monocle Bream
Scolopsis lineata