Red Coral Platy with black spots

[Root]

I have been breeding some red coral platies for several months now. They have pumped out hundreds of fry, but there is this one, probably a juvenile now, that was born with some black spots directly above and below the point before its tail fin. I have read that this could be cancer or part of genetics. If that is the case, what can I expect as far as breeding goes?

Edited August 26 by Root

[AnotherHumanPerson]

could you provide a photo? Black dots in those two locations makes me think of the “ear” marks on the tails mickey mouse platies… it could be the same trait, just finally manifesting itself in your line.

[Root]

On 8/26/2023 at 6:21 PM, AnotherHumanPerson said:

could you provide a photo?

Thanks for the reply. This was the best I could get. 

Edited August 26 by Root

[AnotherHumanPerson]

On 8/26/2023 at 5:24 PM, Root said:

Thanks for the reply. This was the best I could get. 

hm, it does look at least a little like it, my blue wag platies have something similar. 

[PineSong]

If you want to breed only solid red platies, you might want to remove that one who may be carrying some Mickey Mouse or wag genetics that will lead to more offspring with more black coloration. 
There are increased cancer risks for platies with black coloration, but there are also millions of healthy platies with black on them. I’m not sure if there is a way to tell which bloodlines have high cancer rates unless your fish develops cancer. So until that happens, I would breed or not breed the fish with black spots according to whether or not I want to keep my bloodlines solid red.