Mix the Cajun Seasoning ingredients together and pour into a container with a shaker top. An emptied and cleaned out plastic spice container would work well.
Remove the skin from the catfish fillets.
Mix the marinade ingredients together in a bowl. Place the fillets and marinade in a ziplock bag. Seal it up and place it in the refrigerator for 2 hours.
Get your smoker up to about 220° F. Apple or Hickory wood works nicely with these catfish.
You’ll want to use a stainless wire mesh screen or vegetable grill trays to keep the catfish from falling through the racks as they cook.
Place your fillets on the screen/trays and sprinkle the side facing up lightly with Cajun Seasoning.
Smoke for about 15 minutes at 220° F, then flip the fillets and sprinkle the other side with Cajun Seasoning. Continue cooking until internal temperature reaches 135° at the center of the thickest part of the fillet. (Approximately 35 minutes until fully cooked).
Remove from the smoker and enjoy!