I imported a line of these from Thailand 1.5 – 2 years ago for a side project. These are the only fish I currently have that can’t be entered in an IFGA class. They are the most rapidly reproducing guppies I’ve ever owned. If you don’t immediately separate the females, you’ll have a thousand/million fry to deal with.
A couple months ago I set up a cross between a Merah female and an IFGA type Moscow blue. The goal was to get better shape and better size. I should know how those look in a few weeks. The females also have the same “starburst” finnage. According to an old copy of Guppy Color Bank I have, the crown tail shape is autosomal dominant, though sometimes this happens only partially across the fins. (i.e., the trait isn’t determined by the sex of the fish). I set up my new cross with a crown tail female and a Moscow male. I can always try it the other way around, depending on the results. I’ll post photos of those in a few weeks.
The Guppy Color Bank states that this line was first introduced in a Japanese tropical fish magazine back in 2005. However, I found a $3 thrift store copy of Dr. Axelrod’s Mini-Atlas of Freshwater Aquarium Fishes (almost 1,000 pages!). On page 517, there is a photo of an early “blue crowntail.” The tail is not fully defined. But considering this book was published in 1987, crown tails have probably been around at least 30 years. I’ll post a snapshot of this “vintage” photo at the bottom.