Combine the red, white, and black peppers, paprika, thyme, oregano, bay leaf, and salt in a small bowl.

Heat vegetable oil in a heavy-bottomed pot (5 quart or larger) over medium heat.

Add chopped onions, celery, and green bell pepper to the pot. Increase heat to high.

Stir frequently, add minced garlic, file powder, hot pepper sauce, and the pepper-herb mixture.

Cook for 5 minutes, stirring constantly.

Add tomato sauce and stir as it reduces over high heat.

Add fish stock and bring to a boil.

Reduce heat and simmer for 1 hour, stirring occasionally.

When ready to serve, add shrimp, oysters, and crabmeat.

Cover and wait 5 minutes.

Turn off heat and let stand for 10 minutes before serving.