If you fish the Mississippi River between MO and IL here are the catfish creel limits.
Mississippi River (between IL & MO)Illinois waters (Multiple Counties)
All fishermen shall conform with the regulations of the state in which
they are fishing unless the regulations of the fishermen’s licensing
state are more restrictive, then the fishermen must conform with the
more restrictive regulations.
Channel or Blue Catfish (14) . . . 20 Fish Daily Creel LimitFlathead Catfish . . . . . . . . . . . . . 10 Fish Daily Creel Limit
All Nongame Species Combined — 100 Fish Daily Creel LimitPike, Chain/Grass Pickeral, Walleye, Sauger, Paddlefish.)
(Excludes endangered and threatened species and the following
game species: Crappie, Channel/Blue/Flathead Catfish, Rock
Bass, Warmouth, White/Yellow/Striped/Hybrid Striped Bass, Trout,
Largemouth/Smallmouth/Spotted Bass, Muskellunge,Northern
14) Daily catch limit includes all fish species (either singly or in the4) Channel or Blue Catfish
aggregate) caught within each of the following fish groupings.
1) Largemouth or Smallmouth Bass
2) Walleye, Sauger, or their hybrid
3) Bluegill, Redear Sunfish, or Pumpkinseed