The protien was injected long ago. Now they are bread that way. The protien that was used was from a I believe jellyfish or some other ocean invert.
Yeah, I looked into them(because I, too, don't condone "painting"), and apparently they can pass the coloring on genetically as well(now, after how many fishy slaughters). I would never buy them, I guess, anyway, but I'd rather see kids buying these than the painted or tattooed fish.
edit: maybe I misread, now that I see your post about the embryos. oh well, my stance remains.
Also, I agree with redneckgearhead, my grandpa's got some bass out in his pond that I'm sure would go nuts for one
And Chipmunk, I'm going to be buying a few more guppies here soon(my first acclimation attempt killed 3 of the 4, I rushed it...), let me know(PM) if you really want to see if they can be taken to saltwater. I'll try looking it up first, but I'll probably start Thursday or something. If my wife doesn't like a neon pink fishy, I've got 6 cichlids that might