Preheat oven to 350 ºF. Rinse fish fillets in cold water. Pat dry with paper towels. Coat each fillet with olive oil and season with salt and pepper.
Place fish fillets on a baking sheet, and bake for 25–30 minutes or until fish is white and flakes easily with a fork in the thickest part (to a minimum internal temperature of 145 °F).
For sauce, heat olive oil in a medium-sized saucepan.
Add bell peppers, and cook gently until they are still firm, but tender, about 3–5 minutes.
Add tomatoes and tomato sauce, and bring to a boil over high heat. Reduce heat and simmer for 10–15 minutes or until the tomatoes are soft. Add oregano, basil, and parsley, and simmer for an additional 2–3 minutes. Remove sauce from the heat and set aside.
When the fish is done (see step 2), remove from the oven.
Serve each 3-ounce fillet with 1 cup of sauce.
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