Once again the urge to create a new fish struck. So, today, while going through our blue mickey mouse maculatus, I imagined the iridescent blue of the platies on a swordtail. I selected a few female platies and, after some thought, picked a male swordtail to father the new color strain. Which sword and why did I have to ponder it? I picked a black swordtail male that had iridescent green-blue scales. Typically, I wouldn’t use such a male as black swordtail breeder because I prefer the jet black fish in that strain and consider the iridescence a fault to breed against. But, he was perfect for this application since he already had genes for iridescence.
So, the chosen male sword got his females. In about a month I’ll purge the first batch of fry these females drop. Their next batches of fry should have some sword/platy hybrids. They will be easy to spot as they mature. They’ll be longer and larger than platies and the males will sport short swords. I expect a variety of colors. I’ll pick fish of both sexes with the best iridescent blue to produce an F2 generation. If I get nothing with blue, I’ll pick any iridescent fish. Absent those, I’ll throw all the hybrids together and hope for more luck in the next generation. In any event, eventually I’ll get a blue iridescent sword. From there I’ll simply raise tons of offspring and select only the best of each generation until I get the perfect blue iridescent sword.
I’ll keep you posted on my progress.