Cook onion, green pepper, mushrooms and garlic in margarine in large saucepan or Dutch oven over medium-high heat until tender crisp.
Stir in tomatoes and juice, broth, red pepper, thyme, and basil. Bring to a boil. Reduce heat; simmer uncovered 10-15 minutes.
Stir in okra, fish and shrimp; simmer until fish flakes with fork, 5-8 minutes. Serve rice on top of gumbo.
Microwave Directions: Combine onion, green pepper, mushrooms, garlic and margarine in deep 2 to 3 quart microwave safe baking dish. Cover and cook on HIGH 4 minutes; stir after 2 minutes. Stir in tomatoes and juice, broth, red pepper, thyme and basil. Cover and cook on HIGH 10 minutes; stir. Reduce setting to MEDIUM and cook, covered, 10-12 minutes. Stir in okra, fish and shrimp; cook, covered, on HIGH 5 minutes. Let stand 5 minutes. Serve rice on top of gumbo.