In a large skillet
, heat the olive oil
over medium-high heat, and saute the onion, bell peppers, garlic, saffron, sweet paprika, hot paprika (if using), and ginger for 3 minutes, or until the onion begins to soften. Add the tomatoes and saute for another 2 minutes, to blend the flavors. Transfer the mixture to the insert of a 5- to 7-qt/4.5- to 6.5-L slow cooker and stir in the orange juice. Place the sea bass on top of the tomato mixture, and spoon some of the mixture over the fish. Cover and cook for 2 hours on high, or 3 to 4 hours on low. At the end of the cooking time, the sea bass should be opaque in the center.
Using a fish spatula, carefully lift the fish out of the slow cooker, transfer to a serving platter
, and cover loosely with aluminum foil. Skim off any excess fat from the sauce, stir in the parsley and cilantro, and season with salt and pepper. Spoon some of the sauce over the fish, and garnish the platter with the orange slices. Serve immediately, passing the remaining sauce on the side.