Morning All.
A topic actually quite close to my heart.
Super reds came about a good while ago (10 years as memory serves) and, as said above, are a line bred varient of golds.
The real question is "Where did gold severums come from?"
The first hurdle we've got to clear (and its a pretty big one) is that no severum has ever been recorded in the wild, as being golden. (or if it has, it hasn't survived, or been collected etc)
The heros family dont seem to show any tendancy to produce luthistic or albino offspring (im sure its possible, but i've never seen or heard of one, and im pretty sure that such a fish would be exploited by the trade)
Now, lets say a luthistic severum was found, and bred on a commercial basis. The genes would be recessive, so unless the gene pool was constantly refreshed with unrelated "yellow" severums, the liniage would die out.
Lets rule out the possibility (not saying its impossible, but unlikely) for the moment and look at other members of the Heroine tribe.
Amphilophus labiatus - The True Red Devil - In its natural form, shows a distinct yellow/orange colour, and should, theoretically share similar genetics to severums, perhaps just enough to make cross hybridization possible.
This would go a long way to explaining away the, frankly, un-severum like colours of the gold morph, as well as the hit and miss fertility, and the availability and robust health of most gold severums. (It's going to be a damn sight easier to breed two commonly available species then it is to breed 2 luthistic freak occurances (look at EBJDs' and their rather frail health compared to their normal counterparts - I have never seen a gold sev that seemed any more prone to illness then a green)
Based on the fact that Gold sevs often display very little of the characteristics of their green counterparts (the final, full stress bar before the tale, a single black dot in the anal and dorsal fin etc. Common in all examples of Heros) i think we're looking at something a little more then line breeding.
Im of the personal opinion that Golds are a full blown hybrid, and that most of the bog standard golds are only a couple of generations down the line (i know a good % of them come from the far east) as they dont seem to show any of the draw backs of heavily line bred fish.
That said, like Peathster says, unless you've got a couple of grand you'd like the burn, we're very unlikely to find out for sure, and its all going to come down to personal opinion and guess work. (unless anyone fancys risking their red devils with then green sevs?)
I've got access to both species wild forms, and i wont be trying it any time soon ;-)
Just my tuppence.
Craig