Was the study you cited experimental on the fish for the purpose of modifying the fish or to study the effects of the drug in question?View attachment 1420356
What a lot of people don't know is, that this isn't just something that naturally occurs and those fish get sold to hobbyists that want them, hell no, there is a market for such "deformities" and some breeders use hormones and such things to create more of them...
I know hormone dosing does happen in the hobby. I would guess that the reason is mainly to effect color, size or general growth rates.
Breeding for a trait that is being produced by selective breeding programs like short bodied or albinism or even longer fins, isn’t something that is being produced by hormone dosing. As far as I know.
If anyone has knowledge of this correct me if I’m wrong.