Black Cod with Fennel Chowder and Smoked Oyster Panzanella

Name: Black Cod with Fennel Chowder and Smoked Oyster Panzanella
Ingredients: 3 tablespoons butter; 3/4 cup 1/4-inch cubes fresh fennel bulb; 3/4 cup 1/4- to 1/3-inch cubes peeled Yukon Gold potato; 1/2 cup chopped onion; 1/4 cup finely chopped leek (white and pale green parts only); 1 tablespoon all purpose flour; 2 small bay leaves; 1 1/2 teaspoons chopped fresh thyme; 1 8-ounce bottle clam juice; 3/4 cup whipping cream; 3/4 cup whole milk; 1 teaspoon finely grated lemon peel; 1/4 cup finely chopped celery; 1/4 cup finely chopped shallot; 2 tablespoons chopped fresh parsley; 4 1/2 teaspoons fresh lemon juice, divided; 1/2 teaspoon finely grated lemon peel; 1/4 cup minced smoked canned oysters; 5 tablespoons unsalted butter, divided; 1 tablespoon chopped fresh thyme; 4 black cod fillets with skin; Coarse kosher salt; 1/4 cup panko (Japanese breadcrumbs),* toasted