In a Dutch oven, sauté green peppers, onions, celery, carrots, mushrooms, and garlic in olive oil until soft. Stir in tomatoes, tomato sauce, herbs, salt, and pepper. Bring to a boil, then reduce heat. Cover and simmer 2 hours. While liquid is simmering, soak clams under running water.
After 2 hours of simmering, add wine, fish, shrimp, crab, lobster, and scallops to Dutch oven. Simmer, covered, for 10 minutes, then add clams. Steam until shells open, about 5 to 10 minutes. Sprinkle with parsley and serve.