 In its native range, Eastern mosquitofish may be confused with the Western Mosquitofish ("Gambusia affin"i"s") or the sailfin molly ("Poecilia latipinna").In eastern Australia, the female and juvenile local Pacific blue-eye ("Pseudomugil signifer") are similar in appearance but have a forked tail fin.French naturalist Charles Frédéric Girard described the species in 1859.