Went out and did some reading on Giant Wels catfish.
Lankishire England in 2002 had a problem in a bird sactuary with one attacking swans. Portugal has phenominal fresh water fishing. But the locals don't fish for the Wels. They consider them trash. An unfished population of these giants has lead to regular stories of busted tackle, towed boats and local fishermen's sightings of fish longer than the boat.
Russia has report's of 700 lb Wels being caught. In the 80's I met a german tourist in california who told me a story of being on a bridge one day in germany when a dachshund fell of the bridge. While it was swimming for shore a Wels came up under it and had a weiner for lunch........................ .....