Combine first 7 ingredients in a bowl; sprinkle with 1/8 teaspoon salt. Toss well.
Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Sprinkle fish with remaining 1/8 teaspoon salt and pepper. Add fish to pan; cook 4 minutes on each side or until fish flakes easily when tested with a fork or until desired degree of doneness. Serve with tomato mixture.