Those are gorgeous! Did you find them in brackish water? If they were in fresh and you can get them to breed you could make a killing selling those beauties! Assuming its legal, of course 

There are various Molly species found naturally from the Carolinas down the coast, around FL and right on down to South America.Someone who had to get rid of their fish may have dumped some a long time ago and they adapted and mated.
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Very likely that they are regulated as baitfish.They certainly are fun to watch - they're so active (I guess it's cool not being the smallest fish in the pond, so to speak). The two smallest ones are swimming around with each other near the surface, and the larger ones are dispersed among the tank.
We caught them in the freshest water florida offers - a spring near High Springs, FL (they were caught about 25 ft from where the water spills out from underground). The spring then flows into the Santa Fe river. I was more curious because the water is about 70 degrees constantly, and I always pegged them as warmer water fish.
I assume it's legal to sell them, but I'd have to talk to my LFS owner. He's really good about buying fish back, especially from a breeder he knows. I'll let you all know if there's success in that field.