A good friend of mine is a Catfishing freak. Most of my Catfish knowledge comes from him. He says the 3 BIG species around here (Blues, Channels and Flatheads) go on a feeding spree before spawning. He also says generally they don't eat while spawning.....but will attack anything that get's near their "nest". (he used the word nest, not bed)
According to my friend.
Generally Blues are the biggest, and easiest to catch using traditional Catfish methods. Blues are scavengers and normally eat dead stuff. Drifting, (or at some times trolling) using cut, fresh Bluegill or White Perch are the method most use. They use floats that look like cut down pool noodles fanned out at different depths on multiple rods. I was surprised by this method as I thought Catfish were mostly bottom feeders. They catch a bunch of Blues like this, along with an occasional Flathead, or Channel cat. Fatheads are predators, who's diet is similar to Bass. They mainly eat (live) fish, and crawfish. Channels are smaller that Blues or Flatheads. Their diet is somewhere between Blues and Flatheads.
The World record Blue is 143 pounds. It was caught in Kerr Lake in Virginia. Part of Kerr lake is in NC, but the record was caught in VA. The record for a Blue is over 100 pounds in over a dozen states. (including here in NC, as well as GA, SC TN ect) Blues aren't native to NC. I'm not sure about other states.
The World record Flathead is 123 pounds, caught in Kansas. No other State that I can find has a record over 100 pounds. The NC record is just under 78 pounds. The SC record is 84 pounds. I caught one weighing 53 pounds a couple years ago. (on a Bandit 200, and 12 pound test). Flatheads are native in a small part of NC, but not the lakes I fish.
Channel Cats are smaller. They look similar to Blues. I used to confuse them but finally learned the differences. The World record Channel is 58 pounds and was caught in Santee-Cooper in SC. The NC record in only 27 pounds.
There's other catfish species, both freshwater and saltwater. Around here you'll occasionally see a couple different species of Bullheads, as well as Yellow Catfish. These are much smaller than the other 3 species I've listed.
I'm not a big seafood/fish eater. I have no idea how the different species compare for cooking/eating.