This morning, I come home and found 2 precious Kohaku females (about due date) jumped out of their tank. What a sad news, but fortunately beautiful sunny day today has saved me from any gloomy feeling. Immediately, I go ahead performing C-section to those females to observe their fry's phenotype. The first female on C-section was virginly matched with a comet tail swordtail. This male was born to my pure Kohaku Koi and Hi-fin non-albino Koi male swordtail from Petu. The fact that he developed comet tail phenotype (another black bar on the upper edge of the tail) gained my interest and I would like to reproduce his phenotype for hobby. But to my surprise, majority of his frys could be easily told to have wag tail (see the picture below) and still have tiny chance of surviving after mother's fatality. So, why this comet tail phenotype produce all wag tail in offspring? I will try to cross this male to a Ruby Red female next time to see if a similar result would happen. Update on Jul 08, 2016 Thanks to Dr. Levine for his explanation on my question: "Wagtail is normally a combination of the Co (comet) gene from maculatus platies and the E gene originally found in swordtails. If this comet-tailed male is the father and the babies are all wags, then the female must have carried two copies of the dominant E gene. I’m assuming that the female was neither comet-tailed nor wag." Then, why Co gene appeared in the father swordtail when his parents never showed any comet phenotype? And the E gene that Dr. Levine have mentioned is actually standing for "Extender" - a gene modifier originated in swordtail. It modify Co gene creating phenotype of fin rays and lip (Wag phenotype) of the fish solid black. So, it does not have any effect without Co gene existence (from Ephie's blog). To an extend, there's another black fin The second albino Koi female paired with the comet tail male above also gave birth to all wag. Mr. Mefford also reported to have Wag offspring from his cross of Bleeding Heart Platy with The Comet pattern to a plain White "Ghost" Hifin Platy. Interesting!
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