1. Stir together tomatoes, yellow pepper, celery, cucumber, onion, 1/4 teaspoon each of the salt and black pepper, the olive oil and vinegar; set aside.
2. Sprinkle fish with remaining 1/4 teaspoon each salt and pepper. Place flour on plate. Dip flesh side of fish (not skin) in flour, shaking off excess. Heat a large nonstick skillet over medium-high heat. Coat pan generously with nonstick cooking spray. Add fish to pan, flesh-side down, and cook 3 minutes. Flip and cook an additional 4 minutes or until fish flakes easily. Remove fish to serving platter and keep warm.
3. Meanwhile, heat a medium-size skillet over medium-high heat and add tomato mixture to pan. Cook 4 minutes, stirring often. Serve salsa with fish immediately.
Servings Per Recipe: 4; Amount Per Serving: cal.(kcal): 218, Fat, total(g): 7, chol.(mg): 47, sat. fat(g): 1, carb.(g): 10, fiber(g): 2, pro.(g): 28, sodium(mg): 385, Percent Daily Values are based on a 2,000 calorie diet.