Sprinkle fish evenly with pepper and salt. Heat a large non-stick skillet over medium-high heat. Add oil; swirl to coat. Add fish to pan; cook 3 minutes or until browned on one side. Remove fish from pan.
Add onion, oregano, garlic, and bell pepper to pan; sauté 4 minutes. Stir in tomato and remaining ingredients; bring to a simmer.
Arrange fish on top of tomato mixture, browned sides up. Cover, reduce heat to medium, and simmer 3 minutes or until fish flakes easily with a fork.