This fish is unique to Death Valley, California and is one of several Pupfish species endemic to the Mojave Desert. It is seen here in Salt Creek on the floor of Death Valley on March 16th 2012. The fish are not yet fully mature, and apparently turn blue later in the season. Image I12-0623.
Apparently, there can be only one. Sailfin MollyPoecilia latipinna Blue Springs State ParkOrange City, Volusia County Florida, USAOlympus OM-D E-M5 Mark IIOlympus 14-42mm II R LensPT-EP13 Underwater Housing, PPZR-EP02 Lens Port & 14-42mm Zoom Gear23 April 2018