[2] The body of the fish does not exhibit any specific color other than the black margined scales that may form spots in adult males.

[2] Poecilia kykesis ranges from the Usumacinta River drainage and Lake Petén Itzá in Guatemala to Belize and the Yucatan Peninsula in southeastern Mexico.

[2] Like other species from the P. latipinna complex, P. kykesis inhabits lakes, pools, tidal lagoons, creeks, and similar shallow waters of brackish to freshwater coastal areas.

This dietary preference is posited to have evolved as a result of the transition of the ancestors of the Mollienesia subgenus from freshwater to marine habitats.

Unlike in related species, both large and small males exhibit both courtship display and forced insemination behaviors.

[10] Poecilia kykesis is peaceful enough to be kept in a community aquarium, though the males will only develop their distinctive sail fin in a spacious one.

In captivity it requires a diet of algae and vegetable flakes and, due to its big appetite, good filtration and frequent partial water changes.