Wow!! I initially thought that was in the Okavango, but it's not...
When my buddy comes back from the Delta I'll post sum of his barble pics from there and Zim, those monsters give a damn fine revving!
I'll see if I can find some of his Vundu Catfish pics as well. They not as big as the Welsh, but anything from 40 - 80 Kilo's is possible from what I understand!