Preheat oven to 425 degrees F. Place fish in a parchment paper-lined baking dish. Drizzle with orange juice; season with salt and pepper. Bake 12 to 15 minutes, or until cooked.
While the fish cooks, place oil in a large skillet set over medium-high heat. Add onion, bell pepper, carrot, peas, bok choy, green onion and ginger and stir-fry 2 minutes. Add the chili sauce, soy sauce and water and bring to a simmer. Turn heat to low and reserve until the fish is cooked.
When cooked, arrange 2 pieces of fish on each of 4 plates. Top with vegetables and serve.