I didn't word my initial post very well either, I know the majority of hybrids are naturally bred in tanks, I've seen it myself, whether the majority of this initially occurred in labs was one thing I was wondering, as it happens everywhere now from breeders to in hobbyists tanks. I also thought you were suggesting it was all done via IVF, which I didn't buy either. But I think after clarification you only meant some were IVF, I would narrow that to a few, if any as I haven't seen much proof of that.
On the eb acara note, I'm with gillie, selective breeding Imo produced this, as with ebjd as well.
On the glofish I believe those were originally (specifically the Danio species) pure danio who had jellyfish genes spliced in embryonically and now can reproduce those same genes.
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