Heat the oil in a large pot over high heat. When the oil is hot, add the onions, celery, and green and red peppers and saute' for 1 minute. Add the salt and pepper and saute' for 1 minute. Add the tomatoes, garlic, shallots and saute', stirring occasionally, for about 4 minutes.
Stir in the stock, add the fish, Worcestershire, hot pepper sauce, bay leaves, basil, oregano, and thyme, and bring to a boil. Cook over high heat, stirring occasionally, for about 8 minutes. Reduce the heat to medium.
Fold in the okra and creole seasoning, lower the heat, and simmer for 15 minutes. Skim the impurities from the top of the gumbo, turn the heat to high, and cook for 5 minutes. Fold in the shrimp, oysters, and crabmeat, reduce the heat, and simmer for 5 minutes. Slowly sprinkle in the file', stirring to incorporate it thoroughly, and simmer, stirring, for 2 minutes. Remove from the heat. Serve over rice topped with green onions.