I understand your angle... yet want to say it's doable and some people do it, either on a shoestring or if they are made of money... It is especially easy for folks living in tropical climates and having large natural ponds.
I have a strong suspicion that we get RTCs from fish farms, not from the wild. And what we get is a "waste" - culls, underperformers, runts, dinks, etc.
The only 4' RTC that I know of that was raised in captivity was that of Arapaimag (aka Michael Bryce of Canada).
It looks like 99% of captive RTC live out their (more or less) natural lives and still fail to break 3'-3.5'.
I dont disagree with you, but as with all large fish; aros, rtcs, pimas, I think its realistic to say that most dont make it past juvis due poor care and tank size.
