So here are two of my mollies, a male sailfin lyretail silver sphenops, and a female Dalmatian latipinna. The top two pictures are them today, I’ve had the mollies for three months. The male is around two inches long, and the female is closer to three.
The next two pictures are the Dalmatian female the day I got her (left) and a few weeks later (right). She’s gotten much darker, but I believe that’s normal for Dalmatian mollies.
The last three pictures are the male, progressing from the day I got him to about a month ago. He’s gotten some patterning on his body, with gold along the top of his sailfin and black on the end of his tail.
Both mollies have had some growth, and both have become a longer, more streamline shape, enough so that it’s noticeable looking through the pictures.
Love Mollies! I’m pretty sure the male is P. latipinna. Or, rather is a hybrid… all Mollies basically are, save for wild and wild-type ones.
I got a response on this as to whether or not Mollies are hybrids. I don’t have much scientific evidence on the subject, though this article does talk about it some. The truth is that livebearer species readily interbreed, whether Xiphophorus (Platies and Swordtails), Mollies (P. latipinna, P. mexicana, and P. sphenops), Guppies (P. reticulata and P. wingeii), or Gambusia mosquitofish. My understanding is that the “black molly” was originally P. sphenops, a shortfin species, and the black sailfin variants were created by P. sphenops x P. latipinna hybrids. But basically all farmed livebearers are hybrids to some degree.
The only ones that you can find reliably as a single species are wild-type versions… Green Mollies (P. latipinna), Giant Sailfins (P. velifera), Swamp Guppies (Micropoecilia spp) and wild-type Endler’s are pretty reliable. Endler’s a little less so in recent years.