Whisk together lemon juice, oil, pepper and salt in a shallow nonreactive dish. Add catfish and turn to coat with marinade. Cover and refrigerate for 30 minutes.
Preheat grill or broiler.
Grill or broil fish on a lightly oiled rack, turning once, until the fish is opaque, about 10 minutes per inch of thickness. Serve with lemon wedges.
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