Big catfish are notoriously nocturnal. Here are three rigs that will help you catch night feeders.
Lighted Slip Float Rig: Thread a float-stop, bead and lighted float onto your line, Then, add a rubber-core sinker, barrel swivel, leader and a hook (size depends on type of bait). A lithium battery powers this type of float. This rig works well in areas with a little current. Cover wide swaths of areas by floating this rig downstream at various depths, and remember to stay mobile!
Slip Sinker Rig: Slide a 3-ounce egg sinker onto your line, add a large barrel swivel, then tie on a 2-foot leader and a size 6/0 to 9/0 octopus-style hook. Simply cast this out and let sit, or slowly drag back to the boat or shore. If you feel tension, let the fish take it for a few seconds, then set the hook.
Three-Way Rig: Tie on a large 3-way swivel to your line, add a 2-foot leader and a hook, and then a 1-foot dropper and a flat-bottomed, pyramid-style sinker (about 3 ounces). Unlike an egg sinker, the pyramid will not roll in heavy current.