Preheat broiler. Coat catfish with chili powder; season to taste with salt and pepper. Place catfish fillets on greased rack of broiler pan. Broil 4 to 6 inches from heat 8 to 12 minutes, turning once, or until fish flakes with a fork. Break catfish into 2-inch pieces.
Meanwhile, grate 1 teaspoon peel from lime. Squeeze lime to make 1 tablespoon juice. Combine mayonnaise, lime peel and juice.
Fill warm tortillas with catfish, lime-mayonnaise, shredded lettuce, tomato and olives.
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