Preheat broiler.
Combine first 9 ingredients in a zip-top plastic bag. Add 1 catfish fillet. Seal bag, and shake well. Remove fillet from bag, and place on a broiler pan coated with cooking spray. Repeat procedure with the remaining fillets and cornmeal mixture. Broil 6 inches from heat for 6 minutes. Carefully turn fillets over, and broil 6 minutes or until the fish flakes easily when tested with a fork. Serve with lemon wedges, if desired.
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