The biggest catfish ever caught
There are many species of catfish in the world and that makes the task of finding the biggest catfish ever caught somewhat more complicated - here is all the information I could find.
The largest Blue Catfish
Caught in the Mississippi River on May 22, 2005, weighed in at 124 lb (56.2 kg). (SEE VIDEO)
The largest flathead catfish
Caught in Independence, Kansas, weighing 123 lb 9 oz (56.0 kg).
The largest recorded catfish capture
However, these records pale in comparison to a giant Mekong catfish caught in northern Thailand in May 1, 2005 and reported to the press almost 2 months later that weighed 293 kg (646 lb). This is the largest giant Mekong catfish caught, but only since Thai officials started keeping records in 1981. (see picture)
Biggest Mekong Catfish Picture

The largest catfish ever caught video
(source wikipedia and aquaticcommunity.com)