roasted striped bass with shrimp and mussels

Name: roasted striped bass with shrimp and mussels
Ingredients: 2 tablespoons olive oil; 1 cup chopped yellow onions; 2 ounces pancetta or bacon, diced; 1 tablespoon chopped garlic; 1 (28-ounce) can plum tomatoes, drained and diced; 1 teaspoon saffron threads; 1 teaspoon kosher salt; 1/2 teaspoon freshly ground black pepper; 1/2 cup dry white wine; 1 (2 to 3-pound) striped bass fillet, skin removed; 1 pound large shrimp, shelled and deveined; 24 mussels, cleaned and debearded; 2 tablespoons chopped fresh basil