Alex Mustard / Sailfin molly (Poecilia velifera) displaying his large flag-like dorsal fin while courting a female, in a freshwater cenote (or limestone sinkhole). Garden Of Eden Cenote, Puerto Aventuras, Quintana R...

Dave Bevan / Sailfin molly (Poecilia latipinna) pair, captive

Jane Burton / Giant sailfin molly {Poecilia velifera} male in courtship display to female, note regeneration of dorsal fin after injury, captive, from Mexico

Dave Bevan / Male Sailfin molly {Poecilia latipinna} red varient profile, Captive, UK.

Dave Bevan / Male Sailfin molly {Poecilia latipinna} profile, captive, UK.

Henley Spiers / Two male Sailfin mollies (Poecilia latipinna) fighting over mating and territory rights, Cenote Ponderosa, Yucatan, Mexico, Gulf of Mexico.