Re: Sanshoku Genetics
Posted by platymef on 2009/5/16 14:02:20
In Livebearer #204 I made reference to the "so-called" male Lyretail Swordtails with normal gonopodiums.
I used "so-called" not to cause an argument, but because I'm not sure if these males (which I have only seen photos of and have not worked with), are genetically the same as a True Lyretail which have all of their fins lengthened.
The tell, tell way of proving that these males are genetically "Lyretail" is to breed them to common finned females only (remove all Lyretail females from the breeding program). If offspring with Lyretail finnage are produced, then they carry the actual Lyretail trait. If only common finned and/ or fish with finnage like the "male Lyretail with normal gonopodium are produced then a different trait is present, not true Lyretail.
Dr. Joanne Norton mentioned years ago that males in some strains of Hifin Swordtail (without the Lyretail trait), developed a short extension to the top of their caudal fins resembling a Lyretail. This could be a similiar development on a common finned fish. I say this because all of the photos of these males that I've seen show a very short top extension, never close to matching the lower extension.
Again, I'm not trying to start an argument or make enemies, I just want to know if the proper crosses (No Lyretail females), have been made before calling these males "Lyretail".
I'm am not nearly as smart in genetics as some of the other people on here, but I have studied and bred Fancy Xiphophorus for many years.
Darrell E. Mefford
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