Preheat oven to 350°F.
Oil the bottom and sides of a large baking pan.
Layer HALF of the vegetables in the pan starting with the sliced onions, then sliced tomatoes, and finally with sliced red and yellow peppers. Sprinkle the vegetables with the black and Aleppo pepper or cayenne pepper-paprika mix.
Place the fish fillets on top of the vegetables. Layer the remaining onions, tomatoes and peppers on top of the fish. Sprinkle tarragon, oregano, and salt over the vegetables. Pour the lemon juice and wine over all.
Cover the pan tightly with aluminum foil. Bake for 30-40 minutes.