It's possible, monster catfish have been taken out of the Mississippi for centuries. Mark Twain mentions 300 pound catfish in "Huck Finn". A blue catfish was caught on the Missouri some time after the Civil War that weighed in at 315. Noodlers (bare-handed fishermen) regularly land 30 and 40 pound catfish. The largest catfish landed on hook and line was a baby, just about 125 pounds. But when you stop and think about it, what the heck is going to land a 300 pound cat if it doesn't want to be landed?

'Jaws' record-breaking catfish caught in Spain by a Brit
A British angler has landed a European record on his first catfishing expedition. Carl Smith, pictured right with friend Dave Jones, caught the 226lb wels catfish on holiday in Spain.
The men struggled with the 8ft monster for more than 90 minutes and have named it Jaws.