Tampa,
You missed my point, I agreed with you that some Zebra Danios are being sold as GM - because Zebra Danios are the fish equivalent of Lab Rats (used in commercial ecotoxicology tests) and were genetically modified for research purposes and commercial breeders have then taken these fish and made money from them by simple replication. Hence it is low cost to replicate a GMO once it's been done - but the initial splicing of the genes is, as yet, beyond the money you'd get back from selling them (and genetic copyright on fish is tough). So for the vast majority of hobby fish species not used in labs to test the effect of water pollution etc the varieties we are seeing are NOT genetically modified. To my knowledge Fat Head Minnows, Indian Glass Fish and Zebra Danios have been modified, principally for research purposed although the fish have then been bred by commercial farms for the hobby. Rams are not widely used in research and therefore have not been genetically modified - similarly EBJDs. The fluorescent anenomie gene you mention is a fluorescent gene that has been spliced into a few fish to act as a marker - under ultra violet light it glows - you can attach this gene to a gene you are studying and it will produces a bright fluorecent colour when the associated gene is active under UV - allows a fast +/- test result. Critically it is fluorecent under UV only - NOT the natural blue we are seeing in these rams which is present in wild type fish. I think some Indian Glass Fish (develop for research) are being sold with this gene in.
So in short the cost of initially developing the GM fish is high, but where this has been done for research (i.e. if the fish is used in lab tests) they can then be bred for the hobby.
I'll risk admitting I used to work in one of the few Lab in the UK involved in the genetic modification of key crop species (boo! hiss@me). So the public and medias misunderstanding of GM is something I know from personal experience. There is much confusion over what is a GM fish - personally I think we have enough problems with dyed fish and nasty hybrids without GM coming into the hobby. As such we should recognise the few species where it has happened and isolate them, not risk damaging the whole hobby by accusing any new strain as being potentially a GM species. This is worse then the accusation that EBJDs are hybrids and must be nipped in the bud.