I've been interested in the debate between there actually being monster catfish around the dams of the U.S. I personally think any catfish over time could reach world class size in large bodies of water found around most large dams. Just from what I have been reading Blue Catfish seem to have the most potential to being monsters with fish in the late 1800's hitting the 150lb class, with some people talking about 300-350lb fish being captured. I'd personally love to scube dive some of these waters to find out myself. Heres some proof I just found.
http://www.delange.org/HooverDam/HooverDam.htm
Scroll to the bottom to see the pics of some potentially huge cats.
http://www.delange.org/HooverDam/HooverDam.htm
Scroll to the bottom to see the pics of some potentially huge cats.