I think it is really bad that some think you have to hormone a fish in order to sell it. It depends on the amount of the hormone used, how old the fish is, how long the fish is exposed to the hormone and probably 100 other things. However, it may have its place when trying to sex, or identify fish. If used with care and only temporarily the effects to the reproduction ability is nil. Don't confuse hormoned fish with pond raised fish.
Pond raised fish have much more color than tank raised fish due to the sunlight.
The color of a hormoned fish almost looks fake, the color is just too good to be true. If you suspect that a fish may be hormoned then buy at your own risk. Also diet is a very important factor to the coloration of your fish. Try feeding baby brine to one group of fish and dry food to the other. The difference in coloration will surprise you.