04-16-2011, 07:02 PM
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I'm not really familiar with Swortail genetics but the koi strain looks identical to the one you find in Angelfish.
If I remember correctly the Angelfish strain have a double dose of the 'blush' gene so I assume that's the same for the Swordtails?
They also show the orange/red forehead and the black marble markings in exactly the same way. It's fascinating that two completely unrelated species can show exactly the same response to what I presume is exactly the same gene.
I highly recommend you have a look at what Angelfish breeders have done with this gene and in particular Mellow Aquatics, they've eliminated the white in some strains so you have completely orange fish with black marbling...very impressive.
BTW I'm not at all surprised that you have low reproduction rates, these strains are often highly inbred to ensure the passing on of the double dose of this gene and of course that can mean low fertility. It's also not a very robust strain in Angels...Whether that's to do with their inbred nature or if it's something related to the gene itself I'm not sure, it may even be both.
Good luck with your breeding, I'm sure there's more that can be done to manipulate the colours.