Cyprinodontiformes

The Cyprinodontiformes are an order of fish that includes killifish and topminnows. These small, soft-finned fish are found worldwide, particularly in tropical regions of Africa and the Americas. They inhabit a variety of environments, including brackish, salt, and freshwater, and some species can even survive in desert hot springs.1

Killifish typically grow to a maximum of about 15 cm (6 inches) and are surface feeders, consuming both plant and animal matter. A unique adaptation found in some species, particularly those in seasonal pools, is the ability for their eggs to remain dormant in dry mud for extended periods, hatching when water returns. Some killifish are brightly colored and popular in home aquariums, while others are used as bait or for mosquito control.1