Preheat oven to 400°.
Heat oil in a large nonstick skillet over medium-high heat. Sauté bell pepper, celery, onion, and thyme 5 minutes or until onion just begins to brown. Stir in tomato and next 3 ingredients. Bring to a boil; cover, reduce heat, and simmer 2 minutes. Remove from heat. Stir in hot sauce.
Arrange fish in a single layer in a 13 x 9-inch baking dish coated with cooking spray. Sprinkle with Creole seasoning, and top with vegetables. Bake at 400° for 15 minutes or until fish flakes easily when tested with a fork. Sprinkle with parsley.