Heat 1 teaspoon oil in a large nonstick skillet over medium-high heat. Add fennel, bell pepper, and onion; sauté 4 to 5 minutes or until golden brown and just tender. Reduce heat to low; add orange juice, and cook 30 seconds or until liquid evaporates, stirring constantly. Remove from heat, and stir in olives, capers, 1/4 teaspoon salt, 1/4 teaspoon black pepper, and 2 teaspoons oil. Transfer fennel mixture to a bowl; set aside, and keep warm. Wipe pan clean with a paper towel.
Sprinkle fish with remaining 1/2 teaspoon salt and remaining 1/2 teaspoon black pepper. Heat remaining 1 tablespoon oil in pan over medium-high heat. Add fish to pan, and cook 2 to 3 minutes on each side or until desired degree of doneness. Transfer to plates, and spoon fennel mixture over fish.