On a plate, mix together the paprika, cayenne, thyme,
chili powder, garlic powder, cumin, salt and pepper for the blackened
spice mixture. Dredge the catfish fillets in the spice mixture and set
aside.
Heat a large cast iron fry pan or saute pan over high heat until it is "white hot".
Add oil to pan. When oil begins to slightly smoke, add
catfish fillets and cook on each side, about 2 to 3 minutes. Cook in
batches, if necessary, and transfer cooked fillets to a preheated 200
degree F oven while cooking remaining fillets.
To serve, top each fillet with 1/2 tablespoon of butter and serve with lemon wedges.