In small bowl combine celery, onion, zucchini, parsley flakes, lemon juice and black pepper.
Place fish fillets in 12x8-in baking dish.
Top with vegetable mixture.
Arrange red pepper strips over vegetables.
Cover with wax paper.
Microwave at 50% (Medium) 10 to 15 minutes, or until fish flakes easily with fork, rearranging fillets once during cooking.
Let stand, covered, 2 to 3 minutes.