In a large pot over medium-high heat,heat olive oil. Add fish pieces and cook 3-4 minutes,or until lightly browned. Add wine, okra,tomatoes,onions,garlic,parsley,salt and shrimp. Bring to a boil,then reduce heat to medium and cook an additional 4-5 minutes.
Add mussels and chopped clams with their juice. Cook an additional 4 minutes,or just until mussels open. Do not overcook mussels. Discard any mussels that do not open by themselves. Make sure you have a loaf of Italian crusty bread for dunking.