Cut bell peppers in half lengthwise; discard seeds and membranes. Place bell pepper halves, skin sides up, on a foil-lined baking sheet; flatten with hand. Broil 12 minutes or until peppers are blackened. Place bell peppers in a zip-top plastic bag; seal. Let stand 10 minutes; peel and cut into 1/2-inch strips. Combine bell peppers, basil, cilantro, 3 teaspoons oil, vinegar, 1/4 teaspoon salt, 1/8 teaspoon black pepper, and garlic in a medium bowl.
Sprinkle fish with 1/4 teaspoon salt and 1/8 teaspoon pepper. Heat 1 teaspoon oil in a large nonstick skillet over medium heat. Add fish; cook 5 minutes on each side or until fish flakes easily when tested with a fork. Serve with roasted peppers.