Pigeons on the menu for some catfish

Looks like the European Wels. I am amazed that they have never been introduced into the US (so far as I know).

It is indeed the European Wels. It is considered to be introduced in western Europe because its "original" range did not include that. But since there is no major biogeographical barrier between its traditional range and the new range other than land bewteen rivers being barriers, it is not all that invasive. But it was probably put there by anglers.

I wrote the catfish up here a while back: http://10000birds.com/bird-eating-catfish.htm

Also, there is not a fish that eats another bird: http://10000birds.com/africa-tigerfish-eat-swallows.htm

I think we have to keep an eye on the fish.