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...

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