Quite a bit rarer than the large-spotted Peruvian form. Not many photos at all available, so to that end, here's some photos of Gray Fullbuster the Colombian pictus catfish (and some clown loach photobombers).
I've never known for sure where the pictus come from. I vaguely recall reading about artificial breeding but this is not enough to be certain that we get captive bred fish. With the tremendous volumes of pictus catfish offered worldwide at almost any LFS, including the big box stores, and online and the seeming year round availability, I think it is a good guess that they are captive bred.
Does anyone know for sure?
The short / blunt snout on many of our pictus (including that 8" specimen you linked above) may also point to artificial breeding. This is just a vague hunch based on seeing this with other fish, such as Synodontis eupterus for instance.
As for the manner of death, a good portion of fish we lose get swollen before they die. Not bloated, although this happens too, but swollen more or less evenly across different body parts. Yet, I do not recall any details as to how that 8" pictus died. One thing is obvious that I pulled it out with some delay and the tank mates had done some work on it already and the flesh might have started spoiling a bit too much already too. Sorry. Gruesome details.
Not very helpful, I know, but that's all I can add at this point.
Nothing wrong with this thread, albeit I'd post all of this in your thread on your Gray, the pictus. IIRC you have one (or more?). I personally like to have every post that concerns one particular fish in one thread. This convenience is way underrated.