xiphophorus

Recently I crossed blue tuxedo female and white mickey mouse male. After raising 1 month some of them showed slight tuxedo pattern and others not. And those showing tuxedo was male and others seemed female. So I thoght female was WY(Tuxedo) and male was YY. But thesedays those seemed female...

I am planning to make albino platy by crossing platy and albino swordtail. I know the oncogene xmrk located in X and Y chromosome in platy might cause tumor in hybrid if I am not careful enough. I heard those tumor is melanoma and its progenitor is only macromelanophore. So my question is...

Hello,   I am wondering if this helleri is pregnant. What is your opinion?