I see. So you are in UK, you know Neil, and your pond has a viewing window. Now we are getting somewhere... You have just quadrupled your electronic footprint on the net
The fish look great!
I suppose I was duped in a similar way once - about several years back I saw a fish for sale on Ebay. The ad stated maculatus and it looked close, so I got it. $30. Its appearance was just like you describe of yours. But it grew up to look for all intents and purposes like a blochii, just with a better, crisper spot definition, other than that, I fail to see any differences.
You can spot it here in my blochii thread, especially in the latest videos:
https://www.monsterfishkeepers.com/...odus-blochii-in-4500-gal.682528/#post-7680734
I never searched intently but also I have never seen Pimelodus maculatus for sale at any LFS or on any mail-order vendor list that I came across in the US for the last decade.
I have two blochii too and the only thing (other than Neil suggesting they were maculatus) is that from the front they have a narrower head and mouth than the blochii do. If that's right or not - I don't know - I can only go by what I have and what they were supposed to be.
I just looked through more of your posts, man your living the dream, you keep, have kept and no doubt will keep fish I have only dreamt of keeping for over thirty years AND ( most importantly) in the right way!!!
Although, ive been doing this long enough to know that one days dream is another days nightmare and that it all goes wrong fast.
In 2010 I built my current setup and moved my existing stock into an insulated, heated outbuilding.
Pond built up from the ground on concrete garage base(oh so cold!!!!) out of timber, double lined(arnt pacu great with liners) 15mm acrylic viewing pane , sealed and bolted and equipped with waterfall and houseplants( all sounds much more grand than the real thing at the time). Only to find that after a week, the building was that well insulated it was air tight! Filter crash and I lost almost the exact stock I have now in under 7 days even with mature filters, no overstocking, etc. That was 7 days of fighting to save every fish individually and failing. Took me 7 more days to prove just how airtight and how little oxygen there was in there on a nighttime!.
Taken me since then to build up the stock and the courage to stock the same pond with the same fish, and almost the same layout. Although now with air circulation and no fancy waterfall and houseplants!
Although some of this crew certainly have different characters.
Glad to be up and running again, even in a small way compared to you!